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E Rohwer: LIST OF PUBLICATIONS (updated Sept 2010)

PEER REVIEWED RESEARCH PUBLICATIONS 1. Solute focusing in capillary gas-liquid chromatography: stationary phase focusing;

V.Pretorius, E.R.Rohwer and K.H.Lawson; S.-Afr. Tydskr. Chem. 37(1984)65-66 2. Manufacture by electroforming, of thin-walled nickel capillary columns for gas-liquid

chromatography; V.Pretorius, E.R.Rohwer, P.J.Apps, K.H.Lawson and J.Giesel; J.Chromatogr. A 289(1984)17-29

3. Solute focusing, using the solvent effect in capillary GLC: The solvent effect in the presence of stationary phase; V.Pretorius, K.H.Lawson, E.R.Rohwer and W.Bertsch; HRC&CC 7(1984)92-94 4. An experimental study of cooling during evaporation of liquid films; V.Pretorius,

P.Apps, E.R.Rohwer and K.H.Lawson; HRC&CC 7(1984)209-210 5. The dynamic film concentrator - a new approach to large and dilute samples in GLC;

V.Pretorius, P.Apps, E.R.Rohwer and K.H.Lawson; HRC&CC 7(1984)212-214 6. Solute focusing using the solvent effect - a mass spectrometric investigation of packed

bed inlets V.Pretorius, E.R.Rohwer, K.H.Lawson and P.J.Apps; HRC&CC 7(1984)142-143

7. Deactivation of thin-walled nickel capillary columns for gas-liquid chromatography;

V.Pretorius, E.R.Rohwer, G.A.Hulse, K.H.Lawson and P.J.Apps; HRC&CC 7(1984)429-430

8. The solvent effect in gas-liquid chromatography V.Pretorius, K.H.Lawson,

E.R.Rohwer and P.J.Apps Proceedings of the A.J.P.Martin memorial symp. Editor F.Bruner, Elsevier, 1985, pp347-357

9. A means of improving the performance of heat- shrinkable, polytetrafluoroethylene

joints in capillary gas-liquid chromatography; V.Pretorius, P.J.Apps, E.R.Rohwer and K.H.Lawson; HRC&CC 8(1985)77-78

10. A device for monitoring the static coating of capillary columns for gas-liquid

chromatography; E.R.Rohwer, V.Pretorius and G.A.Hulse; HRC&CC 8(1985)693-694

11. Volatile flavour components of maroela juice; V.Pretorius, E.R.Rohwer, A.Rapp,

L.C.Holtzhausen and H.Mandery; Z. Lebensm. Unters. Forsch. 181(1985)458-461 12. Deactivation, coating and performance of nickel capillary columns for GLC;

E.R.Rohwer, V.Pretorius and G.A.Hulse; HRC&CC 9(1986)30-34

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Also in: Proceedings of the sixth international symposium on capillary chromatography, 1985, Riva del Garda, Italy, p.39-47

13. A Joule-Thomson cooler for stationary-phase - or thermal focusing in capillary GLC;

V.Pretorius, E.R.Rohwer and K.H.Lawson; HRC&CC 9(1986)298-300 14. Simple press-fit connectors for flexible fused silica tubing in GLC; E.R.Rohwer,

V.Pretorius and P.J.Apps; HRC&CC 9(1986)295-297 15. Hybrid fused silica/glass capillary columns for GLC; E.R.Rohwer and V.Pretorius;

HRC&CC 10(1987)145-147 16. Trace analysis of complex organic mixtures using capillary gas-liquid chromatography

and the dynamic solvent effect; P.J.Apps, V.Pretorius, K.H.Lawson, E.R.Rohwer, M.R.Centner, H.W.Viljoen and G.Hulse; HRC&CC 10(1987)122-127

17. Volatile constituents of the spineless monkey orange; V.Pretorius, E.R.Rohwer,

A.Rapp and H.Mandery; Deutsche Lebensmittel-Rundschau 83(6)(1987)180-182 18. Fast pulsed-laser induced electron generation for electron impact mass spectrometry;

E.R.Rohwer, R.C.Beavis, C.Köster, J.Lindner, J.Grotemeyer and E.W.Schlag; Z Naturforsch. 43a(1988)1151-1153

19. Volatile components of the anal gland secretion of the striped polecat, Ictanyx

striatus; P.J.Apps, H.W.Viljoen, V.Pretorius, E.R.Rohwer; S.Afr.Tydskrif.Dierk. 23(2)(1988)136-137

20. Supercritical fluid injection - multiphoton ionisation mass spectrometry; C.Köster,

J.Grotemeyer, E.R.Rohwer, J.Lindner and E.W.Schlag; Advances in Mass Spectrometry vol. 2b, Heyden and Sons Ltd, London, 1989, p.1192-1193

21. Low-cost liquid chromatography.iv."Pulsed open tube gradient generation", a new

approach for generating nanoliter volume linear and tailored gradients for capillary electrophoresis and micro LC; V.Berry and E.R.Rohwer; J Liquid Chrom. 13(8)(1990)1529-1558

22. Headspace gas chromatography of flowers by dynamic solvent effect inlet and pattern

recognition of species specific fragrance profiles; E.R.Rohwer, M.E.C.Erasmus, P.J.Robbertse and H.P.Wolmarans; Proceedings of the 13th International Symposium on Capillary Chromatography. vol 1. Riva del Garda, Italy, 13-16 May 1991, page 344-356.

23. Phosphonic systems. 6. Diethyl 2-methylpentenyl-phosphonates as a model for studies

of the stability of unsaturated phosphonic esters; M.P.Belciug, A.M.Modro, E.R.Rohwer and A.Zwierzak; Phosphorus, Sulfur and Silicon, 63(1991)57-64

24. Rapid analysis of coke oven gas by capillary gas chromatography; W.J.Havenga and

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E.R.Rohwer; Journal of High Resolution Chromatography 15(1992)381-386 25. Photolysis of (Arylmethyl)triphenylphosphonium Salts. Substituent, Counterion, and

Solvent Effects on Reaction Products; C.Imrie, T.A.Modro, E.R.Rohwer, and C.C.P.Wagener; Journal of Organic Chemistry 58(1993)5643-5653

26. Preparation and Storage of Ultra High Purity Hexane for Solvent Effect Gas

Chromatographic Analysis; E.R.Rohwer, G-C Chen and A.J.Hassett; Journal of High Resolution Chromatography 16(1993)561-564 (Also presented as a poster at - and full length paper in the proceedings of - the Fifteenth International Symposium on Capillary Chromatography, Riva del Garda, Italy, May 24-27, 1993)

27. Rapid screening of Rolling Mill Oils using High Temperature Capillary Gas

Chromatography; W.J.Havenga and E.R.Rohwer; Journal of Chromatography A,669(1994)139-150

28. High Speed Analysis of H2S and COS Impurities in Coal Gas by Capillary Gas

Chromatography; J.B.Laurens and E.R.Rohwer; J.High Resol.Chromatogr. 19(1996)217-223

29. Trace Analysis of Semi-Volatile Organic Air Pollutants Using Thick Film Silicone

Rubber Traps with Capillary Gas Chromatography; E.K.Ortner and E.R.Rohwer; J.High Resol.Chromatogr. 19(1996)339-344 (Also presented as a oral presentation at the 16th International Symposium on Capillary Chromatography, Riva del Garda, Italy, Sept 27-30, 1994, see proceedings pp. 842-853)

30. Quantitative Analysis of Volatile Sulphur Compounds in Beer using a Membrane

Extration Interface; A.Dercksen, J.Laurens, P.Torline, B.C.Axcell, E.Rohwer; Journal of the American Society of Brewing Chemists 16(4)(1996)228-233

31. Factors influencing breakthrough volumes when using sorption traps at high flow

rates; J.B.Laurens and E.R.Rohwer; J.High Resol.Chromatogr. 20(1997)119-121 32. Hyphenation of Gas Chromatography and Resonance-Enhanced Laser Mass

Spectrometry (REMPI-TOFMS): A Multidimensional Analytical Technique; R Zimmermann, U Boesl, H Heger, E Rohwer, E Ortner, E Schlag and A Kettrup; J High Resol. Chromatogr. 20(1997)461-470

33. Composition of the essential oil of Lippia Scaberrima Sond. from South Africa; F.C.

Terblanche, G.Kornelius, A.J.Hassett and E.R.Rohwer; J. Essential Oil Res. 10(Mar/Apr.1998)213-215.

34. Coupling of Gas Chromatography with Jet-REMPI Spectroscopy and Mass

Spectrometry; R.Zimmermann, H.J.Heger, E.R.Rohwer, E.W.Schlag, A.Kettrup, U.Boesl; Proceedings of the 8th Resonance Ionization Spectroscopy Symposium 1996, American Institute of Physics (AIP)-Conference Poceedings 388, AIP-Press New York (1997)119-122

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35. Resonance Ionization Laser Mass Spectrometry: New Possibilities for On-Line

Analysis of Waste Incinerator Emissions; R.Zimmermann, E.R.Rohwer, H.J.Heger, E.W.Schlag, A.Kettrup, G.Gilch, D.Lenoir, U.Boesl.; Proceedings of the 8th Resonance Ionization Spectroscopy Symposium 1996, American Institute of Physics (AIP)-Conference Poceedings 388, AIP-Press New York (1997) 123-126

36. A novel interface for optimized coupling of gas chromatography and supersonic jet

spectroscopy; H J Heger, R Dorfner, R Zimmermann, E R Rohwer, U Boesl, A Kettrup.; J High Resolution Chromatography 22(1999)391-394

37 Dynamic modification of the stationary phase in capillary gas chromatography. II.

Continuous introduction of water vapour; G-C Chen and E R Rohwer J Chromatography A, 845(1999)43-52

38 Analysis of alkane, alkene, aromatic and oxygenated groups in petrochemical

mixtures by supercritical fluid chromatography on silica gel; A Venter, E R Rohwer and A E Laubscher; J Chromatography A, 847(1999)309-321

39 Chemical characterization and screening of hydrocarbon pollution in industrial soils

by headspace solid-phase microextraction; W J Havenga and E R Rohwer J Chromatography A, 848(1999)279-295

40 Trace determination of organic compounds in water by direct enrichment in

multichannel thick film silicone rubber traps with capillary gas chromatography; E K Ortner and E R Rohwer; J High Resolution Chromatography 22(1999)521-526

41 In line catalytic derivitization method for selective detection of chlorinated aromatics

with a hyphenated gas chromatography/laser mass spectrometry technique: A concept for comprehensive detection of isomeric ensembles; R Zimmermann, E R Rohwer and H J Heger; Analytical Chemistry 71(1999)4148-4153

42 Analysis of odorous compounds in water by isolation by closed-loop stripping with a

multichannel silicone rubber trap followed by gas chromatography-mass spectrometry A J Hassett and E R Rohwer; J Chromatography A 841(1999)521-528

43 Trapping efficiency of Aqueous pollutants in multichannel thick film silicone rubber

traps for capillary gas chromatography; E K Ortner and E R Rohwer; J Chromatography A 863(1999)57-68

44 The analysis of organic vapours emitted from the plumes of pool fires on carpet

material; B-J de Vos, M Froneman and E R Rohwer; J Fire Sciences 17 (1999)383-420

45 The use of SPME and GC-MS for the chemical characterisation and assessment of

PAH pollution in aqueous environmental samples; W J Havenga and E R Rohwer; International Journal of Environmental Analytical Chemistry 78(3-4)(2000)205-222

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46 A Capillary-Based Supersonic Jet Inlet System for Resonance-Enhanced Laser

Ionization Mass Spectrometry: Principle and First On-line Process Analytical Applications; K Hafner, R Zimmermann, E R Rohwer, R Dorfner, and A Kettrup; Analytical Chemistry; 73(17) (2001) 4171-4180.

47 Detection of petrol (gasoline) in fire debris by gas chromatography/Mass

Spectrometry (GC/MS/MS); B-J de Vos, M Froneman, E Rohwer and D Sutherland; J Forensic Sci, July 2002, vol 47 no 4, pp 736-756

48 Analysis of cobalt, tantalum, titanium, vanadium and chromium in tungsten carbide

by inductively coupled plasma-optical emission spectrometry; M Archer, R I McCrindle E Rohwer; J. Anal. At. Spectrom., 2003, 18, 1493-1496

49 Comprehensive two-dimensional supercritical fluid and gas chromatography with

independent fast programmed heating of the gas chromatographic column; A Venter and E R Rohwer; Anal.Chem. 2004, 76, 3699-3706

50 On-Line Derivatization for Resonance-Enhanced Multiphoton Ionisation -

Time-of-Flight Mass Spectrometry: Detection of Aliphatic Aldehydes and Amines via Reactive Coupling of Aromatic Photo Ionization Labels; M Fernandes-Whaley, F Mühlberger, A Whaley, T Adam, R Zimmermann, E Rohwer and A Walte; Aaccelerated article@ Anal.Chem. 2005, 77, 1-10

51 Investigating the use of element analysis for differentiation between the geographic

origins of Western Cape wines; P P Minnaar, E R Rohwer and M Booyse; S.Afr.J.Enol.Vitic. 26(2)(2005)95-105

52 The analysis of illicit methaqualone containing preparations by Gas Chromatography-

Mass Spectrometry for forensic purposes; A A Grové, E R Rohwer, J B Laurens and B C Vorster; J. Forensic Sci. 51(2), (2006) 376 - 380

53 Group-type analysis of oxygenated compounds with a silica gel Porous Layer Open

Tubular (PLOT) column and comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC), A Venter, P R Makgwane, E R Rohwer, Anal. Chem. 2006 78(6) 2051-2054

54 Analysis of trace amounts of carbon dioxide, oxygen and carbon monoxide in nitrogen

using dual capillary columns and a pulsed discharge helium ionisation detector. M Janse van Rensburg, A Botha and E Rohwer; J. Chromatography A; 1167 (2007) 102 -108

55 Volatile compounds, quality attributes, mineral composition and pericarp structure of

South African litchi export cvs. Mauritus and McLean=s Red; D Sivakumar, Y Naude, E Rohwer and L Korsten. J.Sci.Food Agric 88:1074-1081 (2008)

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56 Monitoring of trace organic air pollutants a developing country perspective; P.B.C. Forbes and E.R. Rohwer, Air Pollution XVI, Editors CA Brebbia and JWS Longhurst; WIT Transactions on Ecology and the Environment, 2008, vol 116, pp 345-355, ISSN 1743-3541.

57 Multi-channel open tubular traps for headspace sampling, gas chromatographic

fraction collection and olfactory assessment of milk volatiles; Y Naude, M Van Aardt, E R Rohwer; J.Chrom A 1216(2009) 2798 - 2804

58 Investigations into a novel method for atmospheric polycyclic aromatic hydrocarbon

monitoring. Patricia B C Forbes and Egmont R Rohwer; Environ. Pollut. 157 (2009) 2529 - 2535

59 Laser induced fluorescence of polycyclic aromatic hydrocarbons: An approach to gas

standards. P Forbes, A Trüe and E Rohwer; Environ. Chem. Lett. Ms. No. ECLE-D-09-00033R1 published online 11 Sept 2009.

60 Application of laser induced fluorescence to monitor atmospheric polycyclic aromatic

hydrocarbons; P Forbes and E Rohwer; Air Pollution XVIII; Editors CA Brebbia and JWS Longhurst; WIT Transactions on Ecology and the Environment, 2010, vol 136, pp 369-377, ISSN 1743-3541.

61 Evidence for a geochemical origin of the mysterious circles in the Pro-Namib desert;

Yvette Naudé, Margaretha W van Rooyen, Egmont R Rohwer, research article presented for publication in Journal of Arid Environments, Ref: JAE10-176

62 Comprehensive Two-Dimensional Gas Chromatography Time of Flight Mass

Spectrometry (GCxGC-TOFMS) for Environmental Forensic Investigations in Developing Countries; Jayne de Vos, Roger Dixon, Gerhard Vermeulen, Peter Gorst-Allman, Jack Cochran, Egmont Rohwer and Jean-Francois Focant; research article presented for publication in Chemosphere.

63 An evaluation of the analysis of polychlorinated dibenzo-p-dioxins and

polychlorinated dibenzofurans by GCxGCTOFMS; Jayne de Vos, Peter Gorst-Allman and Egmont Rohwer; research article presented for publication in J. Chrom. A

OTHER PUBLICATIONS

1 Report to the Water Research Commission of South Africa: WRC Report No.

831/1/03 of April 2003: Development and implementation of gas and lquid chromatographic organic water profiles as a management tool; M.I.Selala, S.Phirwa, N.Segoe, E.R.Rohwer and C.Schoeman; ISBN no.1-77005-021-3

CONTRIBUTIONS AT INTERNATIONAL CONFERENCES (including full

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length papers in conference proceedings) 1. Poster presentation: A new interface for supercritical fluid chromatography - TOF

mass spectrometry; 5th Symposium on LC - MS, SFC - MS, MS - MS. Freiburg, Germany, 2 - 4 Nov 1988. E.R.Rohwer, J.Grotemeyer, C.Köster, J.Lindner, E.W.Schlag.

2. Poster presentation: Pulsed laser induced electron generation for electron ionisation

mass spectrometry; R.C.Beavis, E.R.Rohwer, J.Lindner, C.Köster, J.Grotemeyer and E.W.Schlag; 37th ASMS Conference on Mass Spectrometry and Allied Topics, Miami Beach, Florida, 21-26 May 1989

3. Poster presentation: Interfacing chromatographic techniques to muliphoton ionisation

mass spectrometry; C.Köster, E.R.Rohwer, J.Grotemeyer and E.W.Schlag; Proc. 37th ASMS Conference on Mass Spectrometry and Allied Topics, Miami Beach, Florida, 21-26 May 1989

4. Poster presentation: A new approach for generating linear and shaped gradients of

nanoliter volumes compatible with electrophoresis in capillaries; V.Berry and E.Rohwer; Second International Symposium on High Performance Capillary Electrophoresis

5. Poster presentation: Isotope ratio measurements on nascent UF6

photoproducts using TOF-MS; R.C.Scales, E.R.Rohwer and H.G.C.Human; 12th International Mass Spectrometry Conference, Amsterdam, 26-30 August 1991, Abstracts page 89.

6. Invited lecture: Capillary gas chromatography and process control; E.R.Rohwer; 3rd International Symposium on Analytical Chemistry in the exploration, mining and processing of materials, Sandton Sun Convention Centre, Sandton, South Africa, 2-7 August 1992; Abstracts page 23

7. Invited lecture: Laser induced ionization and time of flight mass spectrometry as

diagnostic tool in the processing of materials; H.G.C.Human

and E.R.Rohwer; 3rd International Symposium on Analytical Chemistry in the exploration, mining and processing of materials, Sandton Sun Convention Centre, Sandton, South Africa, 2-7 August 1992; Abstracts page 34

8. Invited lecture: Time-of-flight mass spectrometry of solids, gases and biopolymers using laser ionization/desorption; H.J.Strydom, H.G.C.Human, C.R.Green and E.R.Rohwer; Second International Workshop on Physics and Modern Applications of Lasers, 6-14 September 1993, Harare, Zimbabwe. Full length paper in the Proceedings, pp 260-269.

9. Oral presentation at the "18th International Symposium on Capillary

Chromatography", 20 - 24 May 1996, Riva del Garda, Italy ; Laser Induced Jet-REMPI-Mass Spectrometer as Isomer Selective Capillary Gas Chromatographic Detector: An Approach for Rapid Environmental Analysis; R.Zimmermann,

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H.J.Heger, A.Kettrup, K.-W.Schramm, E.R.Rohwer, E.K.Ortner, U.Boesl. Full length paper in the Symposium Proceedings pp.61-75

10. Oral presentation at "8th International Symposium on RIS, RIS-96, Resonance

Ionization Spectrometry & Its Applications", 30 June - 5 July 1996, The Penn State Scanticon, State College, Pennsylvania, USA; Coupling of Gas Chromatography with Jet-REMPI Spectroscopy and Mass Spectrometry; R.Zimmermann, H.J.Heger, E.R.Rohwer, E.W.Schlag, A.Kettrup, U.Boesl. Reviewed paper in the Proceedings.

11. Oral presentation at the A8th International Symposium on RIS, RIS-96, Resonance

Ionization Spectrometry & Its Applications; 30 June - 5 July 1996, The Penn State Scanticon, State College, Pennsylvania, USA; Resonance Ionization Laser Mass Spectrometry: New Possibilities for On-Line Analysis of Waste Incinerator Emissions; R.Zimmermann, E.R.Rohwer, H.J.Heger, E.W.Schlag, A.Kettrup, G.Gilch, D.Lenoir, U.Boesl. Reviewed paper in the Proceedings.

12. Oral presentation at the "American Society of Brewing Chemists Annual

Convention", 11-15 May 1996, Chicago, Illinois, USA.; Quantitative analysis of Volatile Sulphur Compounds in Beer using A Membrane Extraction Interface; A.Dercksen, J.Laurens, P.Torline, B.Axcell, E.Rohwer

13. Poster presentation at the "IQEC'96 - XX International Quantum Electronics

Conference", 14-19 July 1996, Sydney, Australia; A long range dipole-dipole interaction mechanism for the vibrational energy exchange in SF6 and UF6 ; E.Ronander, E.R.Rohwer, C.J.Liebenberg. Abstract in Proceedings.

14. Poster presentation at the "26th International Conference on Combustion", 29 July - 2

August 1996, Naples, Italy; Sensitive and selective measuring techniques for the on-line emission control of the exhaust gas of waste incinerators; H.J.Heger, R.Zimmermann, E.R.Rohwer and U.Boesl

15. Keynote lecture at the 20th

International Symposium on Capillary Chromatography, 25 - 29 May 1998, Riva del Garda, Italy; Gas Chromatography - Laser Mass Spectrometry (GC-REMPI-TOFMS): New supersonic jet inlet technique and catalytic reactor for selective detection of chlorinated aromatics; R.Zimmermann, E.R.Rohwer, H.J.Heger, R.Dorfner, U.Boesl, A.Kettrup; Full length paper (12 page) in proceedings of the Symposium (CDROM)

16. Poster presentation at the 7th International Chemistry Conference in Africa, 34th

Convention of the South African Chemical Institute, 6 - 10 July 1998, Durban, South Africa; Gas chromatographic trace analysis of industrial air; A.C.Botha and E.R Rohwer

17. Poster presentation (abstracts in Proceedings) at the 22nd International Symposium on Chromatography, 13 - 18 September 1998, Rome, Italy; GC-MS analysis of odorous compounds in water; isolation by closed-loop stripping using a multi-channel silicone rubber trap; A J Hassett and E R Rohwer

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18. Poster presentation (abstracts in Proceedings) at the 22nd

International Symposium on Chromatography, 13 - 18 September 1998, Rome, Italy; Trapping efficiency of aqueous pollutants using multichannel thick film silicone rubber traps with capillary gas chromatography; E K Ortner and E R Rohwer

19. Poster presentation (abstracts in Proceedings) at the 22nd International Symposium on Chromatography, 13 - 18 September 1998, Rome, Italy; The analysis of parafin, olefin, aromatic and oxygenate groups in petrochemical mixtures by SFC on silica gel; A Venter, E R Rohwer

and A E Laubscher

20. Poster presentation (abstracts in Proceedings) at the 22nd

International Symposium on Chromatography, 13 - 18 September 1998, Rome, Italy; Dynamic modification of the stationary phase in capillary gas chromatography: I Introduction of low-volatility selectors; G-C Chen and E R Rohwer

21 Poster presentation (abstracts in Proceedings) at the 22nd International Symposium on Chromatography, 13 - 18 September 1998, Rome, Italy; Dynamic modification of the stationary phase in capillary gas chromatography: II Continuous introduction of water vapour; G-C Chen and E R Rohwer

21. Invited plenary lecture presented at the three day seminar, jointly organised by

Protechnik Laboratories, International Co-operation and Assistance Branch of the OPCW and the South African Council for the Non-Proliferation of Weapons of Mass Destruction. ASAI 1999: First African Seminar on Analytical Issues related to the CWC; 16-18 November 1999, Centurion, South Africa. Strategy for the rapid analysis of trace organic compounds, E R Rohwer. Abstract in the Proceedings.

22. Contributions as specialist advisor (organic trace analysis) of the South African

delegation to the United Nations Environmental Programme (UNEP) Workshop on Management of Persistent Organic Pollutants (POPs) for the SADC Region. Lusaka, Zambia, 14-16 February 2000.

23. Contributions as official member of the South African delegation to the 4th

Meeting of the Intergovernmental Negotiating Committee (INC) for an International Legally Binding Instrument for Implementing International Action on Certain Persistent Organic Pollutants (POPs), Bonn, Germany, 20 - 25 March 2000

24. Poster presentation (abstract in CD ROM proceedings) at the 23rd

International Symposium on Capillary Chromatography, 5-10 June 2000, Riva del Garda, Italy; Analysis of VOCs by closed-loop stripping analysis and absorptive concentration; A J Hassett, E R Rohwer, E K Ortner and B Cowan

25. Poster presentation (abstract on page 519 of the Proceedings) at the 28th International Symposium on Combustion, University of Edinburgh, Scotland, 30 July - 4 August 2000; Modification of a REMPI-TOFMS laser mass spectrometer for combustion diagnostics: Implementation of a capillary supersonic jet inlet system; K Hafner, R

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Dorfner, R Zimmermann, E R Rohwer, A Kettrup 26. Contributions as official member of the South African delegation to the 5th

and final Meeting of the Intergovernmental Negotiating Committee (INC) for an International Legally Binding Instrument for Implementing International Action on Certain Persistent Organic Pollutants (POPs), Sandton, 4-9 December 2000

27. Member of the organising committee (programme committee), Chairman of session on Mass Spectrometry & Lasers, Colloqium Spectroscopicum Internationale, CSI XXXII, Pretoria, 8 -13 July 2001

28. Poster presentation: Detection of petrol in fire debris by gas chromatography / mass

spectrometry (GC/MS/MS) B-J de Vos, M Froneman, E Rohwer and D A Sutherland; Conference Abstracts, P4-1, Colloqium Spectroscopicum Internationale, CSI XXXII, Pretoria, 8 -13 July 2001

29. Lecture: Negative ion chemical ionisation mass spectrometry for trace detection of

TNT; B D Debowski, S J van der Walt and E R Rohwer

, Conference Abstracts, Th 3-8, Colloquium Spectroscopicum Internationale, CSI XXXII, Pretoria, 8 -13 July 2001

30. Lecture: Building bridges between ancient knowledge and modern drug discovery through chemical fingerprinting; M Horak

, A J Hassett and E R Rohwer; International Immunopharmacology Congress 2001; Sun City, Pilanesberg, South Africa; 16-20 September 2001

31. Session chair >Capillary GC= and invited Plenary Lecture PL.23: New instrumentation for comprehensive SFCxGC; E Rohwer and A Venter, 25th

International Symposium on Capillary Chromatography, 13-17 May 2002, Riva del Garda, Italy

32. Poster presentation: Optimization of temperature programming rate for a fast, resistively heated gas chromatographic column; A Venter and E R Rohwer; 25th

International Symposium on Capillary Chromatography, 13-17 May 2002, Riva del Garda, Italy

33. Poster presentation: Oxygenate group separation by supercritical fluid chromatography coupled comprehensively to fast programmed gas chromatography (SFCxGC), A Venter, P Makgwane and E R Rohwer; 25th

International Symposium on Capillary Chromatography, 13-17 May 2002, Riva del Garda, Italy

34. Contributions, as only member from Africa, to the First Meeting of the Advisory Group to the Global Network for the Monitoring of Chemicals in the Environment, United Nations Environmental Programme (UNEP), Geneva, 13-14 May 2002

35. Lecture at the 15th International Congress on Electron Microscopy; Penetration of

epoxy resin components through some glove materials, J Coetzee, E R Rohwer, A J Hassett; 1-6 September 2002, Durban, South Africa. Abstract in Proceedings p452

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36. Contributions as national delegate of the South African Water Research Commission:

Global Water Research Coalition (GWRC) Workshop on Endocrine Disruptors, Farm Inn, Pretoria, South Africa, 6-9 October 2002

37. Contributions, as invited guest of the National Metrology Laboratory (CSIR), to the

SADCMET Workshop on : The Role of Metrology in Monitoring Food, Health and the Environment in Southern Africa, CSIR Conference Centre, Pretoria, 20 Nov 2002

38. Chair, sessions 4 on Chromatography and 19a on Instruments; keynote lecture:

Comparing comprehensively coupled techniques: Supercritical Fluid Chromatography-Gas Chromatography, Gas Chromatography-Gas Chromatography and Gas Chromatography-Mass Spectrometry; E R Rohwer

, A J Hassett, E K Harden, S Bauermeister, A Venter, A Zellelow, P Makgwane and W Welthagen; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

39. Poster; Instrumentation for comprehensive two-dimensional supercritical fluid and fast temperature programmed gas chromatography; A Venter and E R Rohwer; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

40. Poster; Analysis of South African essential oils by comprehensive two dimensional

supercritical fluid and gas chromatography, P Makgwane and E R Rohwer, International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

41. Poster; Headspace-gas chromatography-mass spectrometry analysis of skatole and

other off-odours in boar fat, E K Harden, P Lubuma, E R Rohwer and H J de Kock; nternational Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

42. Poster; Optmization of comprehensive two-dimensional gas chromatography and the

analysis of diesel petroleum fractions; W Welthagen, A Z Zellelow, E R Rohwer; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

43. Poster; Analysis of some South African essential oils with comprehensive two-

dimensional gas chromaography; A Z Zellelow

, W Welthagen, E R Rohwer; International Symposium on Analytical Science, International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

44. Poster; The differentiation between localities based on the mineral content of single cultivar wines; P P Minnaar, E R Rohwer, M Lamont; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

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45. Poster; In-situ derivatization of haloacids in silicone rubber traps; M Fernandes-

Whaley, E R Rohwer; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

46. Poster; Investigating the pre-concentration of Dioxins, PAHs and Chlorophenols in

silicone rubber traps with analysis by GC-MS(NCI); A Whaley, E R Rohwer; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

47. Keynote lecture; Different concentrating models for the simultaneous analysis of a

wide volatility range of organic compounds in air using multichannel silicone rubber traps with gas chromatography; E K Harden

, E R Rohwer; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

48. Keynote lecture; Detection of NO by UV Laser Induced Ionisation and TOF-MS, H G C Human

and E R Rohwer; International Symposium on Analytical Science, Analitika 2002, 4 - 10 December 2002, Stellenbosch, South Africa

49. Invited lecture; Optimizing separation in GC x GC and SFC x GC; E Rohwer

, W Welthagen, A Venter; First International Symposium on Comprehensive Multidimensional Gas Chromatography, 6-7 March 2003, Volendam, The Netherlands

50. Poster: Optimization of comprehensive two-dimensional gas chromatography and the analysis of diesel petroleum fractions; W Welthagen, A Zellelow, E Rohwer; First International Symposium on Comprehensive Multidimensional Gas Chromatography, 6-7 March 2003, Volendam, The Netherlands

51. Poster: Instrumentation for comprehensive two-dimensional supercritical fluid and

independent fast-temperature-programmed gas chromatography; A Venter, E Rohwer; First International Symposium on Comprehensive Multidimensional Gas Chromatography, 6-7 March 2003, Volendam, The Netherlands

52. Advisory paper written by workgroup 2 at the >UNEP Workshop to Develop a Global

POPs Monitoring Programme to Support the Effectiveness Evaluation of the Stockholm Convention=, 24- 27 March 2003, Geneva, Switzerland: Pages 18 - 23 of the Proceedings: Substances and Analytical Techniques (to be used for the Global POPs Monitoring Programme); E Rohwer (co-chair), D Muir (co-chair), H K Lee (Rapporteur), Y Huang, A Konoplev, M Morita, T H Koné, J C Tenorio, O Osibanjo, R C K Yive, D Graham, B O Nejeri

53. Poster: Negative Chemical Ionization for the detection of ultra-trace, air-borne

compounds by silicone rubber concentration/desorption and GC-MS; E R Rohwer, A Whaley, S F van der Walt, B D Debowski; 16th International Mass Spectrometry Conference, Edinburgh, Great Britain, 31 August - 5 September 2003

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54. Plenary lecture: Retention time locking for comparing GC-MS and GCxGC data; E

Rohwer, Y Naudé, N Potgieter, A Z Zellelow, E K Harden and A J Hassett; PL 28; 27th

International Symposium on Capillary Chromatography; Riva del Garda, Italy, 31 May - 4 June 2004

55. Invited lecture: Dioxin monitoring B A developing country perspective; PBC Forbes

, ER Rohwer, EK Harden and A Whaley; Enviromin 2004, International Chemistry Conference on Environmental and Health Aspects of Mining, Refining and Related Industries, Kasane, Botswana, 27 June to 1 July 2004.

56. Rapporteur of Workgroup 3 (Sustainability of POPs Laboratories), at the ARegional Workshop on Existing Capacity and Capacity Building Needs to Analyse POPs in Developing Countries@ held by UNEP (United Nations Environment Programme) for the African Region of the Stockholm Convention, 4-6 October 2005, Pretoria. E Rohwer responsible for drafting, discussing, amending the consensus document on Sustainability of POPs Laboratories

57. Poster presentation: Determining alkylphenols from water by concentration and

derivatization in multichannel PDMS traps; M J Fenandes-Whaley and E R Rohwer; 29th

International Symposium on capillary chromatography; (Abstract in CD of the symposium); Riva del Garda, Italy; 29 May - 2 June 2006.

58. Poster presentation; A novel screening method for atmospheric PAHs arising from biomass burning; PBC Forbes, B Dryden-Schofield, Y Naudé and ER Rohwer; International Conference on Atmospheric Chemistry at the Interfaces; 18-22 September 2006, Cape Town.

60. Poster presentation: The purity analysis of nitrogen and oxygen at CSIR NML South

Africa; M Janse van Rensburg, A Botha and E Rohwer; NEN and ISO/TC 158 jointly organised GAS2007 conference in the World Trade Centre in Rotterdam, the Netherlands, 14-16 February 2007 (poster prize)

61. Invited lecture: Laser induced fluorescence as a screening method for atmospheric

polycyclic aromatic hydrocarbons; Patricia Forbes and Egmont Rohwer; Optics and Laser Applications in Medicine and Environmental Monitoring for Sustainable Development, 19-24 November 2007, Cape Coast, Ghana.

62. Poster presentation: The olfactory assessment of milk volatiles by a new method of

capturing and releasing gas chromatographic fractions; Y Naude, M Van Aardt, E Buys, R De Kock and E Rohwer; 32nd International Symposium on Capillary Chromatography, 26-30 May 2008, Riva del Garda, Italy

63. Poster presentation: A novel screening method for atmospheric PAHs arising from

biomass burning; PBC Forbes, B Dryden-Schofield, Y Naudé and ER Rohwer, Atmospheric Chemistry at the Interfaces 2006, 17-22 September 2006, Cape Town. (Also presented at ChromSAAMS 2008, 12-15 October 2008, Bela Bela).

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64. Lecture: Monitoring of trace organic air pollutants a developing country perspective;

P.B.C. Forbes and E.R. Rohwer, Air Pollution 2008, 22-24 September 2008, Skiathos, Greece. Peer reviewed article in conference proceedings, see list of publications.

65. Poster presentation: A new method for quantitative determination of free molecular

and particle bound DDT in contaminated indoor air by GC-MS; Y Naudé, R Bornman, E R Rohwer. 18th International Mass Spectrometry Conference 30 Aug B 4 Sept 2009, Bremen, Germany.

66. Chairman of session: General Analytics/ Forensic and doping analysis; 18th

International Mass Spectrometry Conference, 30 Aug B 4 Sept 2009, Bremen, Germany.

67. Invited lecture: Application of laser induced fluorescence to monitor atmospheric

polycyclic aromatic hydrocarbons; P Forbes and E Rohwer, 18th International Conference on Air Pollution 2010, Kos, Greece, 21 - 23 June 2010. Full paper in peer-reviewed conference proceedings, see list of publications.

68. New multidimensional chromatographic methods for enantiomeric analysis of op-DDT and associated environmental pollutants;Yvette Naudé and Egmont R. Rohwer; Poster presented at the 34nd International Symposium on Capillary Chromatography, 30 May - 4 June 2010, Riva del Garda, Italy

69. Symposium oral presentation: The analysis of pinotage wine aromas by a novel

fractionating olfactometric method combined with comprehensive two dimensional gas chromatography - mass spectrometry; Y Naudé and E Rohwer; IUFoST 2010, Symposium of the International Union of Food Science and Technology, 22-26 August 2010, Cape Town.

CONTRIBUTIONS AT REGIONAL AND NATIONAL SYMPOSIA 1. Invited lecture: Headspace analysis using GLC; E.R.Rohwer, V.Pretorius, P.J.Apps

and K.H.Lawson; Analytical Workshop '83, Durban, 1983 2. Invited lecture: Atmospheric pressure ionization in mass spectrometry E.R.Rohwer;

28th Convention of the South African Chemical Institute, Stellenbosch, 1984 3. Invited lecture: Introduction to gas chromatography-mass spectrometry E.R.Rohwer;

Symposium on Gas Chromatography-Mass Spectrometry, Pretoria, 1984 4. Invited lecture: Quantitation and selectivity in mass spectrometry; E.R.Rohwer;

Symposium on Quantitative Mass Spectrometry, Pretoria, 1985 5. Invited lecture: Present and future trends in capillary column technology for GC;

E.R.Rohwer; National Conference on Chromatography, Durban, 1986

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6. Invited lecture: Mass analysers for mass spectrometry; E.R.Rohwer; Symposium on

Gas Chromatography - Mass Spectrometry, Pretoria, 1987 7. Invited lecture: New trends in combined chromatography/mass spectrometry

techniques; E.R.Rohwer; 40th Convention of the South African Chemical Institute, Johannesburg, January 1989.

8. Invited lecture: SFC en SFC-MS vir die bepaling van plaagdoders; (SFC and

SFC-MS for the determination of pesticides) E.R.Rohwer; One-day symposium of the working group for pesticide analysis, Pretoria, April 1989.

9. Invited lecture: Laser spectroscopy of molecules by multiphoton ionization;

E.R.Rohwer; Carman Symposium on Laser Technology and Spectroscopy, Pretoria, 9 November 1989.

10. Poster presentation: GC profiele van vlugtige verbindings afkomstig van akasia

blomme vir chemotaksonomie (GC profiles of volatile compounds from acacia flowers for chemotaxonomy); M.E.C.Erasmus, V.Pretorius, E.R.Rohwer en P.J.Robbertse; Analytica '90 - First National Symposium on Analytical Science, Pretoria, 19-23 March 1990

11. Poster presentation: Easy conversion of packed column GC for capillary work;

Z.Apostolides, M.Barendse and E.Rohwer; Analytica '90 - First National Symposium on Analytical Science, Pretoria, 19-23 March 1990

12. Poster presentation: Die daarstelling van 'n SFC-apparaat gebaseer op 'n Varian 8500

vloeistofpomp (The manufacture of a SFC instrument based on a Varian 8500 liquid pump); H.W.Viljoen and E.R.Rohwer; Analytica '90 - First National Symposium on Analytical Science, Pretoria, 19-23 March 1990

13. Invited lecture: New developments in time-of-flight mass spectrometry; E.R.Rohwer;

Analytical Forum '90, High Performance Systems, Johannesburg, 28 August 1990 14. Invited lecture: Carrier gases in gas chromatography and purity considerations;

E.R.Rohwer; Fedgas/ChromSA Gas Chromatography Seminar, Johannesburg, 20 June 1991

15. Invited lecture: Advances in chromatography and mass spectrometry pertaining to

biochemical analysis; E.R.Rohwer; Analytica/SACI Symposium on Advances in Modern Analytical Techniques, Pretoria, 3 July 1991

16. Invited lecture: Vlugtydmassaspektrometrie (Time-of-flight mass spectrometry);

H.G.C.Human and E.R.Rohwer; 36th Annual Conference of the South African Institute for Physics, Bloemfontein, R.S.A., July 1991

17. Invited lecture: Toepassings van vlugtydmassaspektrometrie (Applications of time-of-

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flight mass spectrometry); H.G.C.Human and E.R.Rohwer; 36th Annual Conference of the South African Institute for Physics, Bloemfontein, R.S.A., July 1991

18. Invited lecture: Ontwikkeling van metodes vir die analise van spore onsuiwerhede in

lug en water (Development of methods for the analysis of trace impurities in air and water); E.R.Rohwer; Simposium oor omgewingsnavorsing, -bewaring en -bestuur (Symposium on environmental research, - protection, and - management), University of Pretoria, 31 October 1991

19. Invited lecture: Nuwe tegnieke vir die vervaardiging en analise van materiale met

behulp van lasers (New techniques for the manufacture and analysis of materials with lasers); E.R.Rohwer; Simposium oor Materiaalnavorsing aan die Universiteit van Pretoria, University of Pretoria, 14 November 1991

20. Poster presentation: Detection of explosives by ion mobility spectrometry; P.R.Nel

and E.R.Rohwer; National symposium, Chromatography : Mass Spectrometry '92, Warmbad, 3-6 May 1992

21. Poster presentation: Analysis of the essential oil of a Pellargonium

cultivar by gas chromatography - mass spectrometry; M.E.C.Erasmus, A.J.Hassett and E.R.Rohwer; National symposium, Chromatography : Mass Spectrometry '92, Warmbad, 3-6 May 1992

22. Poster presentation: The construction and evaluation of an oxygen specific detector for capillary gas chromatography; W.J.Havenga and E.R.Rohwer; National symposium, Chromatography : Mass Spectrometry '92, Warmbad, 3-6 May 1992

23. Poster presentation: Application of GC and GC-MS to the analysis of coal extracts;

B.D.Debowski, M.E.C.Erasmus, A.J.Hassett, D.L.Morgan and E.R.Rohwer; National symposium, Chromatography : Mass Spectrometry '92, Warmbad, 3-6 May 1992

24. Invited lecture: Extraction of pollutants in water with special reference to solid phase

techniques; A.J.Hassett and E.R.Rohwer; Working Group for Pesticide Analysis Symposium 1993, Onderstepoort, South Africa, 22 April 1993

25. Invited lecture: Matrix-assisted laser desorption time-of-flight mass spectrometry of

high mass proteins; H.J.Strydom, C.R.Green and E.R.Rohwer; 38th Annual Conference of the South African Institute for Physics, 7-9 July 1993, Stellenbosch, South Africa

26. Poster presentation at the " 33rd SACI Convention", 28 Jan - 2 Feb 1996, Cape

Town; Trace Analysis of Organic Water Pollutants using the Multichannel Silicone Rubber Trap with Capillary Gas Chromatography; E.K.Ortner, A.J.Hassett and E.R.Rohwer

27. Poster presentation at the " 33rd SACI Convention", 28 Jan - 2 Feb 1996, Cape

Town; A Comparative Study of Taste and Odour analysis by GC-MS Using a

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Multichannel Silicone Rubber Trap and Closed Loop Stripping Isolation Techniques; A.J.Hassett, E.Ortner and E.R.Rohwer

28. Oral presentation at the "Deutsche Physikalische Gesellschaft - Frühjahrstagung" in

Rostock, Germany, 18 - 21 March 1996. Einlaßtechniken für Lasermassenspektrometer (LAMS); H.J. Heger, R. Zimmermann, E.R.Rohwer und U.Boesl; Verhandlungen der Deutschen Physikalischen Gesellschaft, ISSN 0420-0195, page 689

29. Poster and extended abstract presented at the "29. Diskussionstagung der

Arbeitsgemeinschaft Massenspektrometrie - AGMS'96" , 28 - 31 May 1996, Universität Bremen, Germany; Entwicklung einer dreidimensionalen spurenanalytischen Methode: Kopplung von Gaschromatographie mit isomerenseletiver Jet-REMPI-Massenspektrometrie, R.Zimmermann, H.J.Heger, A.Kettrup, D.Lenoir, K.-W.Schramm, E.R.Rohwer, U.Boesl.

30. Poster presentation at the AMass Spectrometry/Chromatography 1996" National

Symposium, 25-29 August 1996, Vaal Spa, Christiana; Quantitative Analysis of Compound Classes in Petrochemical Samples by Supercritical Fluid Chromatography; A.Venter, M.Probst, A.E.Laubscher, E.R.Rohwer

31. Poster presentation at the AMass Spectrometry/Chromatography 1996" National

Symposium, 25-29 August 1996, Vaal Spa, Christiana; Isolation of Trace Organic Compounds from Environmental Samples for Gas Chromatographic Analysis using the Multichannel Silicone Rubber Trap; E.K.Ortner, A.J.Hassett, E.R.Rohwer (best poster prize)

32. Poster presentation at the AMass Spectrometry/Chromatography 1996" National

Symposium, 25-29 August 1996, Vaal Spa, Christiana; Isolating Tastes and Odours for GC-MS Analysis using a Multichannel Silicone Rubber Trap and Grob Closed-loop Stripping; A.J.Hassett, E.K.Ortner, E.R.Rohwer

33. Invited lecture at the One Day Course >Chemical Analysis: Pride and Prejudice=

presented by the South African Chemical Engineers and the South African Chemical Institute, 12 February 1998, Vaal Triangle Technikon; Gas Chromatography - strengths; E R Rohwer

34. Invited lecture at the One Day Course >Chemical Analysis: Pride and Prejudice=

presented by the South African Chemical Engineers and the South African Chemical Institute, 12 February 1998, Vaal Triangle Technikon; Gas Chromatography - limitations and challenges; E R Rohwer

35. Paper presented (Course manual pp 1-12) at the One Day Course >Chemical Analysis:

Pride and Prejudice= presented by the South African Chemical Engineers and the South African Chemical Institute, 12 February 1998, Vaal Triangle Technikon; Gas Chromatography - an overview for laymen, managers or other end-users of analytical data; E R Rohwer

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36. Lecture at the MPAQASA Symposium 1998, 13 - 14 August 1998, CSIR, Pretoria;

Comparing preconcentration techniques for the gas chromatographic analysis of organic water pollutants; E K Ortner and E R Rohwer

37. Lecture at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; The Determination of Taste and Odour Compounds, found in Water, using a Multi-channel Silicone Rubber Trap and GC-MS Analysis; A J Hassett and E R Rohwer

38. Poster at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; Monitoring amines in industrial air; A C Botha and E R Rohwer

39. Poster at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; A Study of the Extraction Efficiency and Recovery of Organic Water Pollutants with the Mulitchannel Silicone Rubber Trap; E K Ortner and E R Rohwer

40. Poster at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; Increasing the Selectivity of GC Stationary Phases by Gas Phase Introduction of Low-volatility Modifiers; G-C Chen and E R Rohwer

41. Poster at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; Supercritical fluid chromatography of petrochemical mixtures; A Venter, E R Rohwer and A E Laubscher

42. Poster at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; Increasing the polarity of PEG stationary phase in GC by continuous introduction of water vapour; G-C Chen and E R Rohwer

43. Poster at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; Detection of traces of TNT in air by GC-ECD; B D Debowski, S J van der Walt and E R Rohwer

44. Poster at the Analitika=98 Conference (refereed abstract found in Proceedings, ISBN

1-874832-91-9, published by the South African Institute of mining and Metallurgy), 12 - 14 October 1998, Midrand, South Africa; Gas Chromatography - Laser Mass

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Spectrometry: In-line Derivitization Technique for Selective Detection of Chlorinated Aromatics; R Zimmermann, H J Heger and E R Rohwer

45. Poster at the 63rd

Physikertagung, Deutsche Physikalische Gesellschaft, Heidelberg, Germany, 15-19 March 1999; Probenahme und Einlaßsysteme für die Online-Massenspektrometrie (Sampling and inlet systems for on-line Mass Spectrometry) ; R Dorfner, K Hafner, R Zimmermann, H J Heger, F Mühlberger, E Rohwer, A Kettrup and U Boesl

46. Invited lecture at the one day ICP-MS Seminar organized by SASS, SAAMS and the Chemistry Department of the Technikon Witwatersrand, 27 May 1999, Johannesburg, South Africa; Principles of Mass Spectrometry; E R Rohwer

47. Invited lecture at the one day seminar at the University of Stellenbosch: The

Occurrence and Analysis of PCBs and Dioxins: A World-wide Issue, 23 November 1999, Stellenbosch, South Africa; Dioxins and PCBs: What is the situation in South Africa?, E R Rohwer

48. Invited lecture at the Chromatography Mass Spectrometry 2000 Symposium, 16-18

October 2000, Warmbaths: Silicone rubber concentrating devices for Gas Chromatography; E R Rohwer

49. Lecture at the Chromatography Mass Spectrometry 2000 Symposium, 16-18 October

2000, Warmbaths: Detecting landmines by vapour detection; B D Debowski, S J van der Walt

, E R Rohwer

50. Lecture at the Chromatography Mass Spectrometry 2000 Symposium, 16-18 October 2000, Warmbaths: Advanced chemical fingerprinting of polluted water samples using SPME-GC/MS; W J Havenga

and E R Rohwer

51. Poster at the Chromatography Mass Spectrometry 2000 Symposium, 16-18 October 2000, Warmbaths: In-situ derivitization on multichannel silicone rubber traps; M J Fernandes and E R Rohwer

52. Poster at the Chromatography Mass Spectrometry 2000 Symposium, 16-18 October

2000, Warmbaths: Group separation of various oxygenates with sub-critical CO2

using a silica gel PLOT column; A Venter, A E Laubscher and E R Rohwer

53. Poster at the Chromatography Mass Spectrometry 2000 Symposium, 16-18 October 2000, Warmbaths: The multichannel silicone rubber trap used for the analysis of volatile organics in water; A J Hassett and E R Rohwer

54. Invited lecture at the Symposium New Horizons in Analytical Chemistry, organised by

the Analytical Division of SACI, 20 July 2000, Pretoria; Coupling high resolution UV Spectroscopy with Mass Spectrometry, E R Rohwer

55. Panelist at the SAAMS & ChromSA organised meeting; Problem solving: Questions

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and Examples in Chromatographic and MS applications, E Rohwer, P Apps, M Roseman, S de Kock, Sandton, 23 Aug 2001

56. Lecture at 47th Annual Conference of the SA Institute for Physics; Nitrogen Monoxide

detection by UV laser ionization and Time-of-Flight Mass Spectrometry, HGC Human

and ER Rohwer, 25 - 27 September 2002, University of Potchefstroom, Potchefstroom.

57. Lecture at the Short Course on Environmental Analysis in Stellenbosch; Time-of-Flight Mass Spectrometry and Chromatography; E R Rohwer, 11 December 2002, University of Stellenbosch, Stellenbosch

58. Lecture at 1st annual Bio/Chemtek Science and Technology Conference 2003,

Pretoria,15 August 2003; The Analysis Of Essential Oils Using Comprehensive Coupled Chromatographic Techniques, EK Harden

, ER Rohwer, AZ Zellelow, PR Makgwane, A Venter, AJ Hassett

59. Chairman of Chromatography/Mass Spectrometry session: E Rohwer, 6 July 2004; The 37th

National Convention of SACI, CSIR International Convention Centre, Pretoria, 4-9 July 2004.

60. Lecture at The 37th National Convention of SACI, CSIR International Convention Centre, Pretoria, 4-9 July 2004; The use of the comprehensively coupled chromatographic techniques GCxGC and SFCxGC for the analysis of essential oils; E Rohwer

, P Makgwane, A Venter, E Harden, A Zellelow, N Potgieter and Y Naudé

61. Poster at The 37th

National Convention of SACI, CSIR International Convention Centre, Pretoria, 4-9 July 2004; Polydimethylsiloxane as Concentration and Reaction Medium for Gas Chromatographic Analysis of Air Pollutants; M Fernandes-Whaley and E Rohwer.

62. Poster at The 37th

National Convention of SACI, CSIR International Convention Centre, Pretoria, 4-9 July 2004; The Use of Comprehensively Coupled Supercritical Fluid and Gas Chromatography (SFCxGC) for Lemon Grass Essential Oil Fingerprinting; P Makgwane, A Venter and E Rohwer

63. Poster at The 37th

National Convention of SACI, CSIR International Convention Centre, Pretoria, 4-9 July 2004; Beer Aroma Profiling by Purge-and-Trap GC Analysis, using the Multichannel Silicone Rubber Trap; N Potgieter and E Rohwer

64. Poster at The 37th

National Convention of SACI, CSIR International Convention Centre, Pretoria, 4-9 July 2004; Negative Chemical Ionization for the Detection of Ultra-Trace, Air-Borne Compounds by Silicone Rubber Concentration/Desorption and GC-MS; A Whaley, SJ van der Walt, ER Rohwer and BD Debowski

65. Chairman, scientific programme committee, session chairman of the symposium; Chromatography Mass Spectrometry 2004; Buffelspoort, Rustenburg, South Africa,

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17-20 October 2004 66. Lecture at the symposium Chromatography Mass Spectrometry 2004; Buffelspoort,

Rustenburg, South Africa, 17-20 October 2004; The Analysis of Beer Aroma by Modern Gas Chromatographic Techniques; E Rohwer

, N Potgieter, E Harden, Y Naudé

67. Award winning poster at the symposium Chromatography Mass Spectrometry 2004; Buffelspoort, Rustenburg, South Africa, 17-20 October 2004; Concentration and derivatization of trace level endocrine disruptors in water for analysis by gas chromatography-mass spectrometry; M Fernandes-Whaley and E R Rohwer (best poster prize)

68. Poster at the symposium Chromatography Mass Spectrometry 2004; Buffelspoort,

Rustenburg, South Africa, 17-20 October 2004; Beer aroma profiling by purge-and-trap GC analysis using the multichannel silicone rubber trap; N Potgieter, E Harden and E Rohwer

69. Poster at the symposium Chromatography Mass Spectrometry 2004; Buffelspoort,

Rustenburg, South Africa, 17-20 October 2004; GC-MS with negative chemical ionisation for the detection of persistent organic pollutants using silicone rubber concentrators; AES Whaley and ER Rohwer

70. Invited lecture at the one-day conference, A The Greener side of Pulp and Paper@, 21

April 2005, Sappi Technology Centre, The Innovation Hub, Pretoria as part of the TAPPSA Northern Region Conference Program. Title: Detection of POPs (Persistent Organic Pollutants) in Outdoor Air; A Whaley and E Rohwer

71. Member of the organising committee, Chairman of sessions, Analitika Conference

2006, 10 -13 September 2006, Kwa Maritane, Pilansberg, South Africa. 72. Lecture; Concentration and derivatiztion in silicone rubber traps for trace analysis of

air and water pollutants ; M Fernandes-Whaley, E Rohwer, F Muhlberger, A Whaley, T Adam and R Zimmermann; Proceedings p 4, MTS 9; Analitika Conference 2006, 10 -13 September 2006, Kwa Maritane, Pilansberg, South Africa.

73. Poster presentation; A novel technique for the analysis of atmospheric polycyclic

aromatic hydrocarbons; PBC Forbes, E Harden, Y Naudé and ER Rohwer; Proceedings p 23, poster P8; Analitika Conference 2006, 10 -13 September 2006, Kwa Maritane, Pilansberg, South Africa.

74. Poster presentation; A new method for olfactory assessment of gas chromatographic

aroma profiles; M Lim Ah Tock, ER Rohwer and Y Naudé; Proceedings p23, poster P16, Analitika Conference 2006, 10 -13 September 2006, Kwa Maritane, Pilansberg, South Africa. (best poster prize)

75. Poster presentation; A new liquid chromatographic method for the identification of

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tuberculosis and other mycobacterium species; VR Schillack and ER Rohwer; Proceedings p24, poster P29; Analitika Conference 2006, 10 -13 September 2006, Kwa Maritane, Pilansberg, South Africa.

76. Poster presentation; Interesting trends in persistent organic pollutants detection; A

Whaley and ER Rohwer; Proceedings p24, poster P39; Analitika Conference 2006, 10 -13 September 2006, Kwa Maritane, Pilansberg, South Africa.

77. Production of methoxypyrazine flavours by Mycelial fungi from South Africa; A.B.

Mahomed Ali, G.J. Marais, E.R. Rohwer and Y. Naudé. Poster presentation at the Southern African Society for Plant Pathology's 45th Conference (SASPP), Johannesburg, South Africa, January 2007

78. Lecture; A novel screening method for atmospheric polycyclic aromatic

hydrocarbons; P Forbes and E Rohwer; National Association for Clean Air Conference, 10-12 October 2007, Drakensberg.

79. Participation: Energy Summit - Energy Security for sustainable & shared economic

growth for all; Attended by E Rohwer as University of Pretoria representative: Department of Minerals and Energy, Sandton International Convention Centre, 25 - 27 Sept 2007.

80. Production of methoxypyrazines by Penicillium purpurogenum and Penicillium

rubrum. A.B. Mahomed Ali, G.J. Marais, E.R. Rohwer and Y. Naudé; Poster presented at Bio-08 Combined Conference. (Bio-08 is the combination of the SASBMB Congress, Biotech SA Conference and SASM Congress), Grahamstown, January 21 - 25, 2008.

81. Poster presentation: A novel denuder for trace organic air pollutant monitoring; PBC

Forbes, A Trüe and ER Rohwer; ChromSAAMS 2008, 12-15 October 2008, Bela Bela, South Africa

82. Member of organising committee and session chair: ChromSAAMS 2008, 12-15

October 2008, Forever Resorts, Warmbaths, Bela Bela, South Africa 83. Poster presentation: Identification of semiochemical compounds from Eucalyptus

detected by Gonipterus scutellatus, using GC-FID-electroantennography and GC-MS; M Bouwer, R Nadel, B Slippers, MJ Wingfield, Y Naude and E Rohwer; ChromSAAMS 2008, 12-15 October 2008, Bela Bela, South Africa

84. Poster presentation: A new sampling method for the detection of DDT in

contaminated indoor air and dust; Y Naude and E Rohwer; ChromSAAMS 2008, 12-15 October 2008, Bela Bela, South Africa

85. Poster presentation: The olfactory assessment of milk volatiles by a new method of

capturing and releasing gas chromatographic fractions; Y Naude, M Van Aardt, E Buys, R De Kock and E Rohwer; ChromSAAMS 2008, 12-15 October 2008, Bela

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Bela, South Africa 86. Poster presentation: The analysis of biodiesel with coprehensively coupled

supercritical fluid and gas chromatogaphy (SFCxGC); D Malan, S Van der Walt and E Rohwer; ChromSAAMS 2008, 12-15 October 2008, Bela Bela, South Africa

87. Poster presentation: Comparing the Jacobsen (salen) CoIII catalyst and the potato

epoxide hydrolase enzyme for hydrolytic kinetic resolution of styrene oxides; L.C. Stander, C. Simpson, D. Brady, E. R. Rohwer; SACI-GDCh Bi-national Organic Chemistry Conference, 14-19 September 2008, Berg-en-Dal, Kruger National Park, South Africa

88. Invitation to give a keynote lecture at the Analitika 2010 symposium 5-9 December 2010, Stellenbosch.

OTHER INVITED RESEARCH LECTURES 1. Combining mass spectrometry and chromatography: New challenges; E.R.Rohwer;

Institut für physikalische und teoretische Chemie, Tech. Univ. München, Germany, 19 May 1988.

2. Der Lösemitteleffekt: ein neues Verfahren zur "Headspace" Analyse in der

Chromatographie; E.R.Rohwer; Institut für Lebensmitteltechnologie, Tech. Univ. München, Germany, 14 July 1988.

3. Neue Möglichkeiten im Bereich der Chromatographie - Massenspektrometrie;

E.R.Rohwer; Institut für organische Chemie, Univ. Bayreuth, Germany, 26 July 1988. 4. Die Analyse von Aromastoffen mit dem dynamischen Lösemittel-effekt als

Einlass-system für die Gaschromatographie; E.R.Rohwer; Institut für Lebensmittelchemie, Tech. Univ. München, 11 Aug. 1988.

5. Techniques for linking liquid chromatography with mass spectrometry; E.R.Rohwer;

ChromSA seminar, Beckman Instruments, Halfway House, 27 September 1990 6. Monitoring Organic Pollutants in Incinerator Emmission: New Methods based on Gas

Chromatography; E.R.Rohwer; ChromSA seminar at Merck, Midrand, 20 Feb.1997 7. New Approaches to Dioxin Analysis; E.R.Rohwer; Invited lecture at the Research and

Development Division of the AECI, Modderfontein, 7 March 1997 8. Affordable Pollution Control Measures: A Challenge to Analytical Scientists;

E.R.Rohwer; Invited lecture at the Research and Development Division of ISCOR, Pretoria, 25 March 1997

9. Time-of-Flight (TOF) mass spectrometry as a detector for comprehensive two-

dimensional gas chromatography (GCxGC); E Rohwer, Invited lecture at SASTECH, Sasolburg, 29 January 1998

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10. Die gebruik van gepulseerde lasers in die Massaspektrometrie en die

Isotoopskeidingsbedryf, (The use of pulsed lasers in Mass Spectrometry and in Isotope Separation), Department of Chemistry, University of Stellenbosch, Stellenbosch, 11 August 1998

11. Multichannel silicone rubber traps: Trace analysis of explosives in air as an

application, E R Rohwer, Invited lecture at BASF, Ludwigshafen (Germany), 4 October 2001

12. Trace analysis with silicone rubber absorption traps, thermal desorption and GC-MS,

E R Rohwer, Invited lecture at the Institute for Ecological Chemistry, GSF (German federal research centre for health and the environment), Munich, 24 October 2001

13 Recent developments in chromatography; E R Rohwer, invited lecture to the

analytical section of Bio/Chemtek, CSIR, Modderfontein, 17 July 2002 14 Comprehensive multidimensional techniques in chromatography and mass

spectrometry for the analysis of complex mixtures of organic compounds; E R Rohwer, Dep of Chemistry seminar, University of the Witwatersrand, 2 October 2002; lecture repeated at Dep of Chemistry seminar series, University of Pretoria, 4 October 2002

15 GCxGC and GCxGC-TOFMS for essential oil analysis; invited lecture by E R

Rohwer, A Zellelow and E Harden, at the LECO SA seminar on GCxGC-TOFMS held at the CSIR, Pretoria on 21 August 2003.

16 Comparison of the comprehensively coupled chromatographic techniques: GCxGC

and SFCxGC; invited lecture by E Rohwer at the Bavarian Institute for Applied Environmental Research and Technology (BIfA), Department of Environmental and Process Chemistry, Augsburg, Germany, 11 September 2003

17 The development of a multi-purpose silicone rubber trapping device for improved

trace organic analysis in a Chromatography and Mass Spectrometry laboratory; Invited lecture by E Rohwer , Y Naudé, P Forbes and M Fernandes-Whaley, at the Institut für Chemie, University Rostock, Germany, 8 June 2010

CAREER-GUIDANCE AND MOTIVATIONAL ACTIVITIES 1 Careers in Chemistry; E R Rohwer, Invited lecture to the University of Pretoria

Foundation Year (UPFY) students with underprepared backgrounds, 28 February 2002

2 Chemists and Chemistry; E R Rohwer; motivational lecture at the undergraduate

prize-giving ceremony of the Department of Chemistry, Univ Pretoria, 23 October 2002

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3 Careers in Chemistry; E R Rohwer, Invited lecture to the University of Pretoria

Foundation Year (UPFY) students with underprepared backgrounds, 15 May 2003 4 Co-ordinating a Day with Chemistry, 24 June 2003, as part of the winter school for

grade 10 pupils under the auspices of the University of Pretoria AUP with Science@- Russels group with introductory lecture AWhy Chemistry ?@ by E R Rohwer and 4 practical demonstrations by post-graduate students A Whaley, M Fernandes, W Barnard and N Potgieter.

5 Chemistry - the central science; E R Rohwer; Introductory lecture at the Day with

Chemistry, 28 June 2004 ( as part of the winter school for grade 10 pupils under the auspices of the University of Pretoria AUP with Science@- Russels group)

6 Networking as a vehicle for research advancement; E R Rohwer; Invited lecture to the

AEducation network cluster Workshop@ for NRF researchers in education at the National Research Foundation (NRF), Pretoria on 24 August 2004

7 Chemistry - the central science; E R Rohwer; Introductory lecture at the Day with

Chemistry, 28 June 2005 ( as part of the winter school for grade 10 pupils under the auspices of the University of Pretoria AUP with Science@ project ).

8 Careers in Chemistry; E R Rohwer, Invited lecture to the University of Pretoria Foundation Year (UPFY) students with underprepared backgrounds, 15 September 2005

9 The Challenge of Chemistry; E R Rohwer, Introductory lecture at the Day with

Chemistry, 27 June 2006 ( as part of the winter school for grade 10 pupils under the auspices of the University of Pretoria AUP with Science@ project ).

10 Careers in Chemistry; E R Rohwer, Invited lecture to the University of Pretoria

Foundation Year (UPFY) students with underprepared backgrounds, 17 August 2006 11 The Challenge of Chemistry; E R Rohwer, Introductory lecture at the Day with

Chemistry, 26 June 2007 ( as part of the winter school for grade 10 pupils under the auspices of the University of Pretoria AUP with Science@ project ).

12 Careers in Chemistry; E R Rohwer, Invited lecture to the University of Pretoria

Foundation Year (UPFY) students with underprepared backgrounds, 2 August 2007

PATENTS 1 Verfahren zum Nachweis von Substanzen und Substanzklassen, (Method for the

determination of compounds and compound classes), German Patent DE 19754161A1 issued on 26 August 1999; R Zimmermann, E R Rohwer, H J Heger, U Boesl, A Kettrup

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2 Verfahren und Vorrichtung zur Erzeugung eines gerichteten Gasstrahls (Method and device for the generation of a directed gas jet), German Patent granted 10 Nov 2005, DE 19822672 ( PLA 9839); E R Rohwer, R Zimmermann, H J Heger, R Dorfner, U Boesl, A Kettrup US Patent, same authors: AMethods and device for producing a directed gas jet@: Patent number: US 6,390,115 B1 of May 21, 2002.

3 Gaseinlaß für eine Ionquelle (Gas inlet for an ion source), German patent (1998) DE

19822674.8 (PLA 9838) pending; R Zimmermann, E R Rohwer, H J Heger, U Boesl, A Kettrup

4 Gaseinlaß zur Erzeugung eines gerichteten und gekühlten Gasstrahls, (Gas inlet for

the generation of a directed and cooled gas jet), German patent DE 19913451.0 submitted on 25 March 1999, pending; R Zimmermann, E R Rohwer, R Dorfner, U Boesl, A Kettrup. Same authors, US patent no: US 6,772,649 B2, August 10, 2004: Gas inlet for producing a directional and cooled gas jet.

5 Kapillarventil und Verfahren zu seiner Herstellung (Capillary valve and method of

construction) ; German patent DE 10014962.6 submitted on 25 March 2000; E R Rohwer, R Zimmermann, R Dorfner, A Kettrup

6 Chemical Analysis of Samples, SA provisional patent application number ZA

2002/3002, lodging date 16 April 2002, E R Rohwer and A Venter (New instrumentation for comprehensive SFCxGC). Allowed to lapse in 2004.

7 A method of fractionating a mixture, SA provisional patent application ZA

2006/07538; ER Rohwer, MJ Lim Ah Tock, Y Naudé; filed 08 Sep 2006; 8 A method of detecting an analyte, SA provisional patent application ZA 2006/07539 ;

ER Rohwer, PBC Forbes and Y Naudé; filed on 8 Sep 2006 9 A method of analysing a gas sample, SA provisional patent application ZA

2006/07760; ER Rohwer, B Dryden-Schofield, PBC Forbes, Y Naudé; filed on 15 Sep 2006

THESES COMPLETED UNDER SUPERVISION OF E ROHWER MSc theses:

Bodamp-gaschromatografie met die dinamiese oplosmiddeleffekinlaat: Toepassing in die chemotaksonomie van Acacia; M E C Erasmus, University of Pretoria, October 1990 The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis; G-C Chen; University of Pretoria, October 1992

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The quantitative mass spectrometric determination of trace impurities in uranium hexafluoride using relative response factors; M Sowden; University of Pretoria, October 1993

Alternative Concentration Techniques for the Trace Analysis of Semi-Volatile Organic Air Pollutants by Capillary Gas Chromatography; E K Ortner; University of Pretoria, 1994 (cum laude) Supercritical fluid chromatography combined with GC and GC-MS for the analysis of complex petrochemical mixtures; A Venter; University of Pretoria, March 1998 The determination of arsenic in soil by ICP-OES; A E S Whaley; University of Pretoria, October 1999

Analysis of volatile organic compounds in water by sorptive extraction and gas chromatography - mass spectrometry; A J Hassett; University of Pretoria, June 2001 Concentration and derivatisation in silicone rubber traps for gas chromatographic trace analysis of aldehydes; M J Fernandes; University of Pretoria, July 2001 The analysis of some South African essential oils by comprehensive two-dimensional gas chromatography (GCxGC); A Z Zellelow; University of Pretoria, July 2003 Analysis of cobalt, tantalum, titanium, vanadium and chromium in tungsten carbide by inductively coupled plasma - optical emission spectrometry; M Archer; University of Pretoria, March 2004 Gas chromatography coupled with ion trap mass spectrometry (GC-MS and GC-MS-MS) for arson debris analysis; B-J de Vos; University of Pretoria, February 2005 (cum laude) The optimisation of GC x GC and the analysis of diesel petrochemical samples; W Welthagen; University of Pretoria, April 2005 The forensic analysis of illicit methaqualone-containing preparations by gas chromatography and mass spectrometry; A A Grové; University of Pretoria, December 2005 Characterization of essential oils by comprehensively coupled supercritical fluid and gas chromatography (SFCxGC); P. R. Makgwane, March 2006 Analysis of beer aroma using purge-and-trap sampling and gas chromatography; N Potgieter, University of Pretoria, Oct 2006 (cum laude) A new liquid chromatographic method for the identification of tuberculosis and other mycobacterium species; V Schillack, University of Pretoria, Oct 2006 (cum laude) Analysis of trace amounts of oxygen, carbon monoxide and carbon dioxide in nitrogen using gas chromatography; M Janse van Rensburg, University of Pretoria, April 2007 (cum laude)

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The use of high performance liquid chromatography for the analysis of medicinal plants; T M Boloko (Co-supervisor Dr Vinesh Maharaj, CSIR). University of Pretoria, April 2008. Analysis of the mandibular pheromone of living honeybee queens using non-destructive sampling techniques; MM Masemane (co-supervisors: Prof R Crewe and Dr TC Wossler), University of Pretoria, 2009 Aroma analysis of alcoholic beverages using multi-channel silicone rubber traps; M J Lim Ah Tock; (Co-supervisors, Ms Patricia Forbes, Dr Sandra Combrinck) MTech thesis for Tshwane University of Technology, Tshwane University of Technology, 2009 Multi-element analysis of South African wines by ICP-AES and their classification according to geographical origin; P P Minnaar; (co-supervisor Dr O P H Augustyn), February 2009 Identification of volatile organic compounds from Eucalyptus detected by Gonipterus scutellatus (Gyllenhal) females; M C Bouwer; (co-supervisors Prof M Wingfield and Prof B Slippers, FABI) September 2010 Production of pyrazine flavours by mycelial fungi; A B Mahomed-Ali; (supervisor Prof GJ Marais, FABI, University Pretoria, co-supervisor E Rohwer); September 2010 PhD theses: Using Antipyrine, Debrisoquine, Metoprolol and Sparteine as probe drugs of Cytochrome P-450 polymorphism; J Moncrieff; University of Pretoria, October 1993; (Promotor: Prof DeK Sommers, Faculty of Medicine; co-promotor: E R Rohwer) Gas chromatographic trace analysis of sulphur compounds: Industrial applications; J B Laurens; University of Pretoria, Jan 1997 The dynamic modification of gas chromatographic stationary phases by vapours; G-C Chen; University of Pretoria, October 1998 The photochemistry of uranium hexafluoride as applied to laser isotope separation; E Ronander; University of Pretoria, Dec 1998 Analysis of aqueous samples with the multichannel silicone rubber trap and capillary gas chromatography; E K Ortner; University of Pretoria, September 1999 Characterisation of environmental pollution by GC-MS analysis of polycyclic aromatic compounds in water and soil; W J Havenga; University of Pretoria, October 2000 Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC); A Venter; University of Pretoria, Jan 2003 Concentration and derivatization in silicone rubber traps for mass spectrometric and gas chromatographic analysis of air and water pollutants; M J Fernandes-Whaley; University of

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Pretoria, April 2008 Development of a laser induced fluorescence technique for the analysis of organic air pollutants; PBC Forbes, University of Pretoria, February 2010 The quantitative characterisation of geological reference materials by isotope dilution inductively coupled plasma mass spectrometry (ICP-MS), Angelique Botha, September 2010.