Proficiency Testing Scheme for Water Analysis · contains the uncertainties of the target value....

Proficiency Testing Scheme for Water Analysis

Round HB87 Herbicides

Sample Dispatch: 4 November 2013

University of Natural Resources and Life Sciences, Vienna Address: University of Natural Resources and Life Sciences, Vienna Department for Agrobiotechnology IFA-Tulln

Center for Analytical Chemistry Head of Department: Prof. DI. Dr. Rudolf Krska Konrad-Lorenz-Str. 20 3430 Tulln Austria Website: www.ifatest.eu www.ifa-tulln.ac.at www.boku.ac.at Telephone/Fax: +43 2272 66280 - Ext +43 2272 66280 - 403 Proficiency Testing (PT) Scheme:

Lab Manager:

Dr. Wolfgang Kandler Dw 408 [email protected]

Ing. Uta Kachelmeier Dw 461 [email protected]

Dipl.-HTL-Ing. Andrea Koutnik Dw 406 [email protected]

Ing. Marco Reiter Dw 461 [email protected]

Ing. Caroline Stadlmann Dw 406 [email protected]

This report summarises the results of round HB87 (herbicides) within the IFA-Test Proficiency Testing Scheme for water analysis. The samples HB87A and HB87B were distributed to the participants on Monday, 4 November 2013. Closing date for reporting results to the IFA-Tulln was Friday, 29 November 2013.

Fourteen laboratories participated in this interlaboratory comparison. Eleven laboratories submitted results.

Samples

The samples consisted of simulated ground water, which was spiked with solutions of the herbicides. For sample preparation, ultrapure water was spiked with concentrated solutions of inorganic salts in order to simulate the ionic composition of natural ground water. The following salts were added to the samples: Mg(NO3)2, MgSO4, Na2SO4, NaHCO3, KHCO3, CaCl2 and Ca(NO3)2. The calculation of the target concentrations of the compounds was based on the mass of standard added to the samples.

MCPA was not added to sample HB87A. Dichlorprop was not added to sample HB87B in order to check the analytical blank values.

Homogeneity, accuracy and stability tests at the IFA-Tulln

For verification of homogeneity, each sample bottle was analysed for dissolved organic carbon (DOC). The DOC in each bottle is defined by the volume of organic solvent added with the pesticide stock solution. The results of these DOC measurements showed a relative standard deviation of max. 1.17 %. Thus, sufficient sample homogeneity could be demonstrated.

Accuracy of the assigned pesticide concentrations of Bentazone, 2,4-D, Dicamba, Dichlorprop, MCPA and Mecoprop was confirmed by HPLC-DAD measurements. For these measurements three bottles of HB87A and HB87B were analysed prior to sample dispatch. The accuracy of the concentration of Chloridazon, Desphenylchloridazon and Methyldesphenylchloridazon was proven by LC-MS/MS analysis of aliquots from two bottles each of HB87A and HB87B. The results are listed in the results tables and the parameter oriented part of the report (“IFA result“).

Stability tests for the water samples of the present proficiency testing round were carried out four weeks after dispatch. From each sample, two bottles that had been stored at 5°C in the dark were analysed for their herbicide concentrations. The results (mean values) are listed in the parameter-oriented part of this report (”Stability test”).

Results

Data evaluation was based on target concentrations that were calculated from the weights of the standards used to produce the samples. Their uncertainty intervals correspond to the expanded uncertainty (coverage factor k = 2) as described in the EURACHEM/CITAC Guide “Quantifying Uncertainty in Analytical Measurement” (Second Edition).

Recoveries for individual laboratory results and overall mean values were calculated from these target concentrations. The results were tested for outliers using the Hampel outlier test (level of significance 99 %). A minimum number of four results was required for the outlier test.

The target concentration of MCPA in sample HB87A and Dichlorprop in sample HB87B, which were not added to the sample, were set to < 0.05 µg/L MCPA and < 0.05 µg/L Dichlorprop, which meets the minimum quantifiable values defined by the Austrian ground and river water monitoring program and the quantification limits of the analytical methods applied in the IFA.

Standard deviations and coefficients of variation (CVs) were only calculated when at least three results were available. The between laboratory CVs covered the range between 3.3 % (Chloridazon in sample HB87B) and 39.0 % (Methyldesphenylchloridazon in sample HB87B).

The recoveries of the target concentrations, calculated from outlier-corrected data mean values ranged between 88.4 % (Bentazone in sample HB87B) and 129.1 % (Dicamba in sample HB87A).

All confidence intervals of the outlier-corrected laboratory mean values encompass the corresponding target values with their uncertainties. Thus statistically, no difference could be detected between theoretical target concentrations and outlier corrected laboratory means.

z-Scores

The most common approach is to form the z-score given by

zx xi

z z-score xi result of laboratory x target value or mean value („consensus value“) standard deviation

Thus, the z-score is the ratio of the estimated bias (difference between result and target value) and a standard deviation. The z-score criteria were determined from relative standard deviations from all interlaboratory comparisons that were organised by the IFA-Tulln in the period from 2002 to 2012. They represent long-term performance data of all former participating laboratories. The z-scores are listed together with the recoveries in the tables of the parameter oriented part.

Additionally, each laboratory obtained for every sample a single sheet that summarises the z-scores of the laboratory in graphical and tabular form.

The following table lists the z-score criteria as relative standard deviation and their limits of applicability. Z-scores were only calculated, if the target values were higher than these limits.

Parameter z-Score-criteria

(%) Lower limit

[µg/L]

Bentazone 20 0.05

2,4-D 19 0.05

Dicamba 25 0.05

Dichlorprop 17 0.05

MCPA 20 0.05

Mecoprop 19 0.05

Chloridazon 16 0.05

Desphenylchloridazon 15 0.05

Methyldesphenylchloridazon 12 0.05

Normally, a classification based on z-scores is made this way:

|z-Score| Classification

<2 satisfactory

2<|z|<3 questionable

>3 unsatisfactory

Please note that this evaluation is made on the background of the average performance of all participants of the IFA-Test-Systems proficiency testing scheme during the period from 2002 to 2012.

Illustration of results

An explanation to the illustration of the results is given on the following page. Graphical and tabular illustration of results can be divided into a parameter oriented and a laboratory-oriented part.

The laboratory-oriented part contains the measurement results and reported uncertainties of each individual laboratory for all parameters together with the achieved recoveries in graphical and tabular form. This part of the report also lists tables with the results originally reported by the laboratories.

In the parameter-oriented part the reported results and corresponding uncertainties are illustrated together with recoveries of the target values for each parameter and all laboratories. This information is presented in graphical and tabular form. Results which were identified as outliers by the Hampel test are marked with an asterisk in the column “out”. These values were not considered for calculating statistical parameters (mean values, standard deviations and confidence intervals). Moreover, the parameter oriented part contains the uncertainties of the target value. The reported uncertainty is an expanded uncertainty calculated using a coverage factor (k) of 2 which gives a level of confidence of approximately 95% (as described in the EURACHEM / CITAC Guide “Quantifying Uncertainty in Analytical Measurement” (Second Edition)). The uncertainty interval of the reference concentration is illustrated in the graph as a grey band around the 100% recovery line.

Results for which no recoveries can be calculated, are illustrated by one of the following symbols: FN (false negative), FP (false positive) or the • - symbol.

- FN: A result is false negative when the “< result” reported is lower than the corresponding target value (under consideration of the uncertainty of the target value)

- FP: False positive results can be obtained for compounds not added to the samples: a result is termed FP when it is higher than the corresponding method quantification limit of the procedure employed at the IFA-Tulln.

- •: all other results for which no recovery rate can be calculated are illustrated by this symbol

Tulln, 10 December 2013

Sample C10B Parameter Dichloromethane Target value ± U (k=2) 10,4 µg/l ± 0,5 µg/l Obtained from mass weighed out, U = uncertainty

IFA result ± U (k=2) 10,2 µg/l ± 1,0 µg/l Determined at IFA prior to shipment of samples

Stability test ± U (k=2) 10,2 µg/l ± 1,0 µg/l Determined at IFA 5 weeks after sample dispatch

Lab code Result Out +/- Unit Recovery

z-Score

A 11,0 1,28 µg/l 106 % 0,30 B 9,0 1,8 µg/l 87 % -0,71 C 10 2 µg/l 96 % -0,20 D µg/l E 13,7 0,40 µg/l 132 % 1,67 F 6,8 0,7 µg/l 65 % -1,82 G < 20 µg/l H µg/l � I 11,0 µg/l 106% 0,30 J 24,1 * 1,51 µg/l 232 % 6,93 K 10,09 1,22 µg/l 97 % -0,16 L 2,76 * µg/l 27 % -3,87 M 6,38 1,87 µg/l 61 % -2,03 N < 5 0,5 µg/l FN O 15,6 * 4 µg/l 150 % 2,63 P 10,3 1,0 µg/l 99 % -0,05 Q 10 1,14 µg/l 96 % -0,20 R 8,88 0,46 µg/l 85 % -0,77 S µg/l T 9,03 0,08 µg/l 87 % -0,69 U 22,5 * 0,5 µg/l 216 % 6,12 V 10,33 0,25 µg/l 99 % -0,04

All results Outliers excl. Unit Mean +/- CI (99%)

Recov. +/- CI (99%)11,3 ± 3,8

108,3 ± 36,3 9,7 ± 1,6

93,6 ± 15,1 µg/l %

SD between labsRSD between labs

5,3 47,3

1,9 19,1

µg/l %

n for calculation 17 13

EXPLAN

ATIO

N

Number of data used for calculation of statistic parameters

Between laboratory standard deviation

Overall laboratory mean and recovery with corresponding confidence intervals (p=99%)

An asterisk indicates a result detected as outlier by Hampel test

Diagram 2. Recoveries and deviations from target values

Relative deviation from target value in percent

grey band illustrates uncertainty interval of target value

Result neither false positive, false negativenor possible to calculate recovery

False negative: reported �<-result� is lower than target value

Recovery of target value in percent

Interval expected to encompass target value as stated by participant

Recovery [%]

Laboratories

Diagram 1. Measurement results and corresponding uncertainty intervals

z-Score of the laboratory

Result ± uncertainty as stated by participant target value obtained from mass weight

Illustration of Results Tables and Parameter Oriented Part



Results Sample HB87A

Bentazone 2,4-D Dicamba Dichlorprop MCPA

Unit µg/L µg/L µg/L µg/L µg/L

Target value 0.055 0.203 0.154 0.072 <0.05

IFA result 0.065 0.205 0.161 0.081 <0.01

Stability test 0.062 0.208 0.155 0.075 <0.01

A 0.053 0.166 0.138 0.070 <0.03

B

C

D

E 0.051 0.216 0.167 0.076 <0.020

F 0.058 0.314 0.265 0.115 <0.025

G

H

I 0.049 0.404 0.125 <0.01

J 0.06 0.246 0.240 0.09 <0.05

K 0.24 0.25 0.28 0.10 <0.05

L 0.063 0.213 0.077 <0.010

M 0.051 0.219 0.078 <0.01

N 0.048 0.188 0.103 0.071 <0.02

Uncertainties Sample HB87A

Bentazone

±

2,4-D

±

Dicamba ±

Dichlorprop ±

MCPA ±


Target value 0.003 0.010 0.008 0.004

IFA result 0.007 0.020 0.016 0.008

Stability test 0.006 0.021 0.016 0.008

A 0.008 0.025 0.021 0.011

B

C

D

E 0.010 0.043 0.033 0.015

F 0.006 0.027 0.165 0.009

G

H

I 0.01 0.08 0.025

J 0.02 0.06 0.06 0.02 0.02

K 0.02 0.02 0.03 0.02

L

M 0.002 0.022 0.006

N 0.005 0.18 0.01 0.007

Results Sample HB87A

Mecoprop Chloridazon Desphenyl

chloridazon

Methyl desphenyl

chloridazon

Unit µg/L µg/L µg/L µg/L

Target value 0.064 0.098 0.192 0.230

IFA result 0.069 0.116 0.205 0.247

Stability test 0.068 0.086 0.168 0.215

A 0.064 0.107 0.173 0.228

B 0.106 0.190 0.286

C

D

E 0.069

F 0.104 0.273 n.a. n.a.

G 0.076

H

I 0.093 0.103 0.184 0.258

J 0.09

K 0.06

L 0.034 0.102 0.096

M 0.063 0.095 0.167 0.289

N 0.063

Uncertainties Sample HB87A

Mecoprop

±

Chloridazon

±

Desphenyl chloridazon

±

Methyldesphenylchloridazon

±


Target value 0.003 0.005 0.010 0.012

IFA result 0.007 0.023 0.041 0.049

Stability test 0.007 0.017 0.034 0.043

A 0.010 0.016 0.026 0.034

B 0.02 0.06 0.06

C

D

E 0.013

F 0.013 0.051

G 0.020

H

I 0.018 0.021 0.037 0.052

J 0.02

K 0.02

L

M 0.005 0.008 0.011 0.030

N 0.006

Results Sample HB87B

Bentazone 2,4-D Dicamba Dichlorprop MCPA


Target value 0.300 0.250 0.280 <0.05 0.298

IFA result 0.267 0.240 0.265 <0.01 0.275

Stability test 0.282 0.270 0.285 <0.01 0.342

A 0.293 0.209 0.250 <0.03 0.245

B

C

D

E 0.263 0.269 0.308 <0.020 0.301

F 0.278 0.369 0.365 <0.025 0.318

G

H

I 0.235 0.543 <0.01 0.696

J 0.263 0.272 0.294 <0.05 0.373

K 0.40 0.30 0.40 <0.05 0.36

L 0.243 0.216 <0.020 0.261

M 0.276 0.254 <0.01 0.295

N 0.271 0.229 0.252 <0.02 0.273

Uncertainties Sample HB87B

Bentazone

±

2,4-D

±

Dicamba ±

Dichlorprop ±

MCPA ±


Target value 0.015 0.013 0.014 0.015

IFA result 0.027 0.024 0.027 0.028

Stability test 0.028 0.027 0.028 0.034

A 0.044 0.031 0.038 0.037

B

C

D

E 0.053 0.054 0.062 0.060

F 0.010 0.050 0.144 0.057

G

H

I 0.047 0.109 0.139

J 0.07 0.07 0.07 0.02 0.09

K 0.05 0.02 0.05 0.02

L

M 0.011 0.026 0.025

N 0.027 0.023 0.0252 0.027

Results Sample HB87B

Mecoprop Chloridazon Desphenyl

chloridazon

Methyl desphenyl

chloridazon


Target value 0.114 0.353 0.456 0.184

IFA result 0.108 0.367 0.528 0.190

Stability test 0.116 0.340 0.483 0.189

A 0.114 0.348 0.431 0.178

B 0.370 0.480 0.245

C

D

E 0.123

F 0.168 1.01 n.a. n.a.

G 0.135

H

I 0.141 0.352 0.470 0.213

J 0.138

K 0.10

L 0.275 0.260 0.063

M 0.110 0.343 0.433 0.221

N 0.118

Uncertainties Sample HB87B

Mecoprop

±

Chloridazon

±

Desphenyl chloridazon

±

Methyldesphenylchloridazon

±


Target value 0.006 0.018 0.023 0.009

IFA result 0.011 0.073 0.106 0.038

Stability test 0.012 0.068 0.097 0.038

A 0.017 0.052 0.065 0.027

B 0.07 0.14 0.05

C

D

E 0.025

F 0.003 0.116

G 0.035

H

I 0.028 0.070 0.094 0.043

J 0.03

K 0.02

L

M 0.009 0.056 0.042 0.023

N 0.012

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

126,60,070

Unit

±

±

±

±0,075Mean ± CI(99%)

0,062SD between labsRSD between labs

136,0Recov. ± CI(99%)0,054

0,00610,2

98,4µg/l

All results Outliers excl.

9n for calculation 8

%

%

0,00712,4

Lab Code Result ± RecoveryUnit

Recovery [%]

Sample HB87A

Target value 0,055

IFA result 0,065

Stability test 0,062 60%

40%

20%

20%

40%

60%

0,088

0,077

0,066

0,055

0,044

0,033

0,022

Resultµg/l

µg/l

µg/l

[µg/l]

Target value ± U (k=2)

-

-

-

20% 40% 60%

0,0110 0,0220 0,0330

z-Score

83,1

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,003

0,007

0,006

µg/l

µg/l

µg/l

±

±

±

Parameter Bentazone

0,053 0,008 96%µg/lA -0,18

µg/lB

µg/lC

µg/lD

0,051 0,010 93%µg/lE -0,36

0,058 0,006 105%µg/lF 0,27

µg/lG

µg/lH

0,049 0,01 89%µg/lI -0,55

0,06 0,02 109%µg/lJ 0,45

0,24 0,02 436%µg/lK 16,82*

0,063 115%µg/lL 0,73

0,051 0,002 93%µg/lM -0,36

0,048 0,005 87%µg/lN -0,64

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

18,00,054

Unit

±

±

±

±0,280Mean ± CI(99%)


93,4Recov. ± CI(99%)0,265

0,0197,1

88,4µg/l



%

%

0,0237,8


Recovery [%]

Sample HB87B

Target value 0,300

IFA result 0,267


40%

20%

20%

40%

60%

0,480

0,420

0,360

0,300

0,240

0,180

0,120

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0600 0,1200 0,1800

z-Score

17,2

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,015

0,027

0,028

µg/l

µg/l

µg/l

±

±

±

Parameter Bentazone

0,293 0,044 98%µg/lA -0,12

µg/lB

µg/lC

µg/lD

0,263 0,053 88%µg/lE -0,62

0,278 0,010 93%µg/lF -0,37

µg/lG

µg/lH

0,235 0,047 78%µg/lI -1,08

0,263 0,07 88%µg/lJ -0,62

0,40 0,05 133%µg/lK 1,67*

0,243 81%µg/lL -0,95

0,276 0,011 92%µg/lM -0,40

0,271 0,027 90%µg/lN -0,48

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

40,00,081

Unit

±

±

±

±0,246Mean ± CI(99%)


121,3Recov. ± CI(99%)0,227

0,04519,8

111,6µg/l



%

%

0,05527,3


Recovery [%]

Sample HB87A

Target value 0,203

IFA result 0,205


40%

20%

20%

40%

60%

0,325

0,284

0,244

0,203

0,162

0,122

0,081

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0406 0,0812 0,1218

z-Score

29,5

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,010

0,021

0,021

µg/l

µg/l

µg/l

±

±

±

Parameter 2,4-D

0,166 0,025 82%µg/lA -0,96

µg/lB

µg/lC

µg/lD

0,216 0,043 106%µg/lE 0,34

0,314 0,027 155%µg/lF 2,88

µg/lG

µg/lH

0,404 0,08 199%µg/lI 5,21*

0,246 0,06 121%µg/lJ 1,11

0,25 0,02 123%µg/lK 1,22

0,213 105%µg/lL 0,26

0,219 0,022 108%µg/lM 0,41

0,188 0,18 93%µg/lN -0,39

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

47,00,117

Unit

±

±

±

±0,296Mean ± CI(99%)


118,3Recov. ± CI(99%)0,265

0,05219,7

105,9µg/l



%

%

0,06525,8


Recovery [%]

Sample HB87B

Target value 0,250

IFA result 0,240


40%

20%

20%

40%

60%

0,400

0,350

0,300

0,250

0,200

0,150

0,100

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0500 0,1000 0,1500

z-Score

35,4

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,013

0,024

0,027

µg/l

µg/l

µg/l

±

±

±

Parameter 2,4-D

0,209 0,031 84%µg/lA -0,86

µg/lB

µg/lC

µg/lD

0,269 0,054 108%µg/lE 0,40

0,369 0,050 148%µg/lF 2,51

µg/lG

µg/lH

0,543 0,109 217%µg/lI 6,17*

0,272 0,07 109%µg/lJ 0,46

0,30 0,02 120%µg/lK 1,05

0,216 86%µg/lL -0,72

0,254 0,026 102%µg/lM 0,08

0,229 0,023 92%µg/lN -0,44

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

77,90,120

Unit

±

±

±

±0,199Mean ± CI(99%)


129,1Recov. ± CI(99%)0,199

0,07336,7

129,1µg/l



%

%

0,12077,9


Recovery [%]

Sample HB87A

Target value 0,154

IFA result 0,161


40%

20%

20%

40%

60%

0,246

0,216

0,185

0,154

0,123

0,092

0,062

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0308 0,0616 0,0924

z-Score

36,7

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,008

0,016

0,016

µg/l

µg/l

µg/l

±

±

±

Parameter Dicamba

0,138 0,021 90%µg/lA -0,42

µg/lB

µg/lC

µg/lD

0,167 0,033 108%µg/lE 0,34

0,265 0,165 172%µg/lF 2,88

µg/lG

µg/lH

µg/lI

0,240 0,06 156%µg/lJ 2,23

0,28 0,03 182%µg/lK 3,27

µg/lL

µg/lM

0,103 0,01 67%µg/lN -1,32

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

35,60,100

Unit

±

±

±

±0,312Mean ± CI(99%)


111,3Recov. ± CI(99%)0,312

0,06119,4

111,3µg/l



%

%

0,10035,6


Recovery [%]

Sample HB87B

Target value 0,280

IFA result 0,265


40%

20%

20%

40%

60%

0,448

0,392

0,336

0,280

0,224

0,168

0,112

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0560 0,1120 0,1680

z-Score

19,4

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,014

0,027

0,029

µg/l

µg/l

µg/l

±

±

±

Parameter Dicamba

0,250 0,038 89%µg/lA -0,43

µg/lB

µg/lC

µg/lD

0,308 0,062 110%µg/lE 0,40

0,365 0,144 130%µg/lF 1,21

µg/lG

µg/lH

µg/lI

0,294 0,07 105%µg/lJ 0,20

0,40 0,05 143%µg/lK 1,71

µg/lL

µg/lM

0,252 0,0252 90%µg/lN -0,40

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

31,20,022

Unit

±

±

±

±0,089Mean ± CI(99%)


123,8Recov. ± CI(99%)0,085

0,01618,8

117,5µg/l



%

%

0,02027,3


Recovery [%]

Sample HB87A

Target value 0,072

IFA result 0,081


40%

20%

20%

40%

60%

0,115

0,101

0,086

0,072

0,058

0,043

0,029

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0144 0,0288 0,0432

z-Score

22,5

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,004

0,008

0,008

µg/l

µg/l

µg/l

±

±

±

Parameter Dichlorprop

0,070 0,011 97%µg/lA -0,16

µg/lB

µg/lC

µg/lD

0,076 0,015 106%µg/lE 0,33

0,115 0,009 160%µg/lF 3,51

µg/lG

µg/lH

0,125 0,025 174%µg/lI 4,33*

0,09 0,02 125%µg/lJ 1,47

0,10 0,02 139%µg/lK 2,29

0,077 107%µg/lL 0,41

0,078 0,006 108%µg/lM 0,49

0,071 0,007 99%µg/lN -0,08

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

UnitMean ± CI(99%)


Recov. ± CI(99%)µg/l


n for calculation

%

%


Recovery [%]

Sample HB87B

Target value <0,05

IFA result <0,01

Stability test <0,01 60%

40%

20%

20%

40%

60%

0,05

Resultµg/l

µg/l

µg/l

[µg/l]

-

-

-

20% 40% 60%

z-Score

µg/l

Laboratories

RecoveryDeviation

Target value

Parameter Dichlorprop

<0,03 •µg/lA

µg/lB

µg/lC

µg/lD

<0,020 •µg/lE

<0,025 •µg/lF

µg/lG

µg/lH

<0,01 •µg/lI

<0,05 0,02 •µg/lJ

<0,05 •µg/lK

<0,020 •µg/lL

<0,01 •µg/lM

<0,02 •µg/lN

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

UnitMean ± CI(99%)


Recov. ± CI(99%)µg/l


n for calculation

%

%


Recovery [%]

Sample HB87A

Target value <0,05

IFA result <0,01

Stability test <0,01 60%

40%

20%

20%

40%

60%

0,05

Resultµg/l

µg/l

µg/l

[µg/l]

-

-

-

20% 40% 60%

z-Score

µg/l

Laboratories

RecoveryDeviation

Target value

Parameter MCPA

<0,03 •µg/lA

µg/lB

µg/lC

µg/lD

<0,020 •µg/lE

<0,025 •µg/lF

µg/lG

µg/lH

<0,01 •µg/lI

<0,05 0,02 •µg/lJ

<0,05 •µg/lK

<0,010 •µg/lL

<0,01 •µg/lM

<0,02 •µg/lN

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

51,70,154

Unit

±

±

±

±0,347Mean ± CI(99%)


116,4Recov. ± CI(99%)0,303

0,04515,0

101,8µg/l



%

%

0,05618,9


Recovery [%]

Sample HB87B

Target value 0,298

IFA result 0,275


40%

20%

20%

40%

60%

0,477

0,417

0,358

0,298

0,238

0,179

0,119

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0596 0,1192 0,1788

z-Score

39,7

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,015

0,028

0,034

µg/l

µg/l

µg/l

±

±

±

Parameter MCPA

0,245 0,037 82%µg/lA -0,89

µg/lB

µg/lC

µg/lD

0,301 0,060 101%µg/lE 0,05

0,318 0,057 107%µg/lF 0,34

µg/lG

µg/lH

0,696 0,139 234%µg/lI 6,68*

0,373 0,09 125%µg/lJ 1,26

0,36 0,02 121%µg/lK 1,04

0,261 88%µg/lL -0,62

0,295 0,025 99%µg/lM -0,05

0,273 0,027 92%µg/lN -0,42

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

32,50,021

Unit

±

±

±

±0,072Mean ± CI(99%)


111,9Recov. ± CI(99%)0,072

0,02028,0

111,9µg/l



%

%

0,02132,5


Recovery [%]

Sample HB87A

Target value 0,064

IFA result 0,069


40%

20%

20%

40%

60%

0,102

0,090

0,077

0,064

0,051

0,038

0,026

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0128 0,0256 0,0384

z-Score

28,0

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,003

0,007

0,007

µg/l

µg/l

µg/l

±

±

±

Parameter Mecoprop

0,064 0,010 100%µg/lA 0,00

µg/lB

µg/lC

µg/lD

0,069 0,013 108%µg/lE 0,41

0,104 0,013 163%µg/lF 3,29

0,076 0,020 119%µg/lG 0,99

µg/lH

0,093 0,018 145%µg/lI 2,38

0,09 0,02 141%µg/lJ 2,14

0,06 0,02 94%µg/lK -0,33

0,034 53%µg/lL -2,47

0,063 0,005 98%µg/lM -0,08

0,063 0,006 98%µg/lN -0,08

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

45,90,052

Unit

±

±

±

±0,142Mean ± CI(99%)


124,7Recov. ± CI(99%)0,127

0,02016,0

111,8µg/l



%

%

0,02320,1


Recovery [%]

Sample HB87B

Target value 0,114

IFA result 0,108


40%

20%

20%

40%

60%

0,182

0,160

0,137

0,114

0,091

0,068

0,046

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0228 0,0456 0,0684

z-Score

35,5

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,006

0,011

0,012

µg/l

µg/l

µg/l

±

±

±

Parameter Mecoprop

0,114 0,017 100%µg/lA 0,00

µg/lB

µg/lC

µg/lD

0,123 0,025 108%µg/lE 0,42

0,168 0,003 147%µg/lF 2,49

0,135 0,035 118%µg/lG 0,97

µg/lH

0,141 0,028 124%µg/lI 1,25

0,138 0,03 121%µg/lJ 1,11

0,10 0,02 88%µg/lK -0,65

0,275 241%µg/lL 7,43*

0,110 0,009 96%µg/lM -0,18

0,118 0,012 104%µg/lN 0,18

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

117,00,115

Unit

±

±

±

±0,131Mean ± CI(99%)


133,7Recov. ± CI(99%)0,103

0,0054,6

104,7µg/l



%

%

0,0109,9


Recovery [%]

Sample HB87A

Target value 0,098

IFA result 0,116


40%

20%

20%

40%

60%

0,157

0,137

0,118

0,098

0,078

0,059

0,039

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0196 0,0392 0,0588

z-Score

53,2

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,005

0,023

0,017

µg/l

µg/l

µg/l

±

±

±

Parameter Chloridazon

0,107 0,016 109%µg/lA 0,57

0,106 0,02 108%µg/lB 0,51

µg/lC

µg/lD

µg/lE

0,273 0,051 279%µg/lF 11,16*

µg/lG

µg/lH

0,103 0,021 105%µg/lI 0,32

µg/lJ

µg/lK

0,102 104%µg/lL 0,26

0,095 0,008 97%µg/lM -0,19

µg/lN

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

129,80,458

Unit

±

±

±

±0,447Mean ± CI(99%)


126,7Recov. ± CI(99%)0,353

0,0123,3

100,1µg/l



%

%

0,0349,7


Recovery [%]

Sample HB87B

Target value 0,353

IFA result 0,367


40%

20%

20%

40%

60%

0,565

0,494

0,424

0,353

0,282

0,212

0,141

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0706 0,1412 0,2118

z-Score

62,3

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,018

0,073

0,068

µg/l

µg/l

µg/l

±

±

±

Parameter Chloridazon

0,348 0,052 99%µg/lA -0,09

0,370 0,07 105%µg/lB 0,30

µg/lC

µg/lD

µg/lE

1,01 0,116 286%µg/lF 11,63*

µg/lG

µg/lH

0,352 0,070 100%µg/lI -0,02

µg/lJ

µg/lK

0,260 74%µg/lL -1,65*

0,343 0,056 97%µg/lM -0,18

µg/lN

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

15,80,030

Unit

±

±

±

±0,179Mean ± CI(99%)


93,0Recov. ± CI(99%)0,179

0,0105,8

93,0µg/l



%

%

0,03015,8


Recovery [%]

Sample HB87A

Target value 0,192

IFA result 0,205


40%

20%

20%

40%

60%

0,307

0,269

0,230

0,192

0,154

0,115

0,077

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0384 0,0768 0,1152

z-Score

5,8

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,010

0,041

0,034

µg/l

µg/l

µg/l

±

±

±

Parameter DPhChloridazon

0,173 0,026 90%µg/lA -0,66

0,190 0,06 99%µg/lB -0,07

µg/lC

µg/lD

µg/lE

n,a. µg/lF

µg/lG

µg/lH

0,184 0,037 96%µg/lI -0,28

µg/lJ

µg/lK

µg/lL

0,167 0,011 87%µg/lM -0,87

µg/lN

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

16,10,074

Unit

±

±

±

±0,454Mean ± CI(99%)


99,5Recov. ± CI(99%)0,454

0,0255,6

99,5µg/l



%

%

0,07416,1


Recovery [%]

Sample HB87B

Target value 0,456

IFA result 0,528


40%

20%

20%

40%

60%

0,730

0,638

0,547

0,456

0,365

0,274

0,182

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0912 0,1824 0,2736

z-Score

5,6

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,023

0,106

0,097

µg/l

µg/l

µg/l

±

±

±

Parameter DPhChloridazon

0,431 0,065 95%µg/lA -0,37

0,480 0,14 105%µg/lB 0,35

µg/lC

µg/lD

µg/lE

n,a. µg/lF

µg/lG

µg/lH

0,470 0,094 103%µg/lI 0,20

µg/lJ

µg/lK

µg/lL

0,433 0,042 95%µg/lM -0,34

µg/lN

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

71,20,164

Unit

±

±

±

±0,231Mean ± CI(99%)


100,6Recov. ± CI(99%)0,231

0,08034,4

100,6µg/l



%

%

0,16471,2


Recovery [%]

Sample HB87A

Target value 0,230

IFA result 0,247


40%

20%

20%

40%

60%

0,368

0,322

0,276

0,230

0,184

0,138

0,092

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0460 0,0920 0,1380

z-Score

34,4

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,012

0,049

0,043

µg/l

µg/l

µg/l

±

±

±

Parameter MDPhChloridazon

0,228 0,034 99%µg/lA -0,07

0,286 0,06 124%µg/lB 2,03

µg/lC

µg/lD

µg/lE

n,a. µg/lF

µg/lG

µg/lH

0,258 0,052 112%µg/lI 1,01

µg/lJ

µg/lK

0,096 42%µg/lL -4,86

0,289 0,030 126%µg/lM 2,14

µg/lN

60

70

80

90

100

110

120

130

140

A

A

B

B

C

C

D

D

E

E

F

F

G

G

H

H

I

I

J

J

K

K

L

L

M

M

N

N

80,20,148

Unit

±

±

±

±0,184Mean ± CI(99%)


100,0Recov. ± CI(99%)0,184

0,07239,0

100,0µg/l



%

%

0,14880,2


Recovery [%]

Sample HB87B

Target value 0,184

IFA result 0,190


40%

20%

20%

40%

60%

0,294

0,258

0,221

0,184

0,147

0,110

0,074

Resultµg/l

µg/l

µg/l

[µg/l]


-

-

-

20% 40% 60%

0,0368 0,0736 0,1104

z-Score

39,0

µg/l

Laboratories

RecoveryDeviation

± U (k=2)

± U (k=2)

± U (k=2)

0,009

0,038

0,038

µg/l

µg/l

µg/l

±

±

±

Parameter MDPhChloridazon

0,178 0,027 97%µg/lA -0,27

0,245 0,05 133%µg/lB 2,76

µg/lC

µg/lD

µg/lE

n,a. µg/lF

µg/lG

µg/lH

0,213 0,043 116%µg/lI 1,31

µg/lJ

µg/lK

0,063 34%µg/lL -5,48

0,221 0,023 120%µg/lM 1,68

µg/lN

Illustration of Results Laboratory Oriented Part



60

70

80

90

100

110

120

130

140

Bentazone 2,4-D Dicamba Dichlorprop MCPA Mecoprop Chloridazon DPhChloridazon MDPhChloridazon

Sample HB87A

Laboratory A

Parameter Target value

Result ± RecoveryUnit

Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,053 0,008 96%µg/l0,003Bentazone

0,203 0,166 0,025 82%µg/l0,0102,4-D

0,154 0,138 0,021 90%µg/l0,008Dicamba

0,072 0,070 0,011 97%µg/l0,004Dichlorprop

<0,05 <0,03 •µg/lMCPA

0,064 0,064 0,010 100%µg/l0,003Mecoprop

0,098 0,107 0,016 109%µg/l0,005Chloridazon

0,192 0,173 0,026 90%µg/l0,010DPhChloridazon

0,230 0,228 0,034 99%µg/l0,012MDPhChloridazon

60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory A



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,293 0,044 98%µg/l0,015Bentazone

0,250 0,209 0,031 84%µg/l0,0132,4-D

0,280 0,250 0,038 89%µg/l0,014Dicamba

<0,05 <0,03 •µg/lDichlorprop

0,298 0,245 0,037 82%µg/l0,015MCPA

0,114 0,114 0,017 100%µg/l0,006Mecoprop

0,353 0,348 0,052 99%µg/l0,018Chloridazon



60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory B



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 µg/l0,003Bentazone

0,203 µg/l0,0102,4-D

0,154 µg/l0,008Dicamba

0,072 µg/l0,004Dichlorprop

<0,05 µg/lMCPA

0,064 µg/l0,003Mecoprop

0,098 0,106 0,02 108%µg/l0,005Chloridazon



60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory B



Recovery [%]

RecoveryDeviation

± U (k=2)


0,250 µg/l0,0132,4-D


<0,05 µg/lDichlorprop

0,298 µg/l0,015MCPA


0,353 0,370 0,07 105%µg/l0,018Chloridazon



60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory C



Recovery [%]

RecoveryDeviation

± U (k=2)


0,203 µg/l0,0102,4-D



<0,05 µg/lMCPA


0,098 µg/l0,005Chloridazon

0,192 µg/l0,010DPhChloridazon

0,230 µg/l0,012MDPhChloridazon

60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory C



Recovery [%]

RecoveryDeviation

± U (k=2)


0,250 µg/l0,0132,4-D



0,298 µg/l0,015MCPA





60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory D



Recovery [%]

RecoveryDeviation

± U (k=2)


0,203 µg/l0,0102,4-D



<0,05 µg/lMCPA





60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory D



Recovery [%]

RecoveryDeviation

± U (k=2)


0,250 µg/l0,0132,4-D



0,298 µg/l0,015MCPA





60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory E



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,051 0,010 93%µg/l0,003Bentazone

0,203 0,216 0,043 106%µg/l0,0102,4-D

0,154 0,167 0,033 108%µg/l0,008Dicamba

0,072 0,076 0,015 106%µg/l0,004Dichlorprop

<0,05 <0,020 •µg/lMCPA

0,064 0,069 0,013 108%µg/l0,003Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory E



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,263 0,053 88%µg/l0,015Bentazone

0,250 0,269 0,054 108%µg/l0,0132,4-D

0,280 0,308 0,062 110%µg/l0,014Dicamba


0,298 0,301 0,060 101%µg/l0,015MCPA

0,114 0,123 0,025 108%µg/l0,006Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory F



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,058 0,006 105%µg/l0,003Bentazone

0,203 0,314 0,027 155%µg/l0,0102,4-D

0,154 0,265 0,165 172%µg/l0,008Dicamba

0,072 0,115 0,009 160%µg/l0,004Dichlorprop

<0,05 <0,025 •µg/lMCPA

0,064 0,104 0,013 163%µg/l0,003Mecoprop

0,098 0,273 0,051 279%µg/l0,005Chloridazon

0,192 n,a. µg/l0,010DPhChloridazon

0,230 n,a. µg/l0,012MDPhChloridazon

60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory F



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,278 0,010 93%µg/l0,015Bentazone

0,250 0,369 0,050 148%µg/l0,0132,4-D

0,280 0,365 0,144 130%µg/l0,014Dicamba


0,298 0,318 0,057 107%µg/l0,015MCPA

0,114 0,168 0,003 147%µg/l0,006Mecoprop

0,353 1,01 0,116 286%µg/l0,018Chloridazon

0,456 n,a. µg/l0,023DPhChloridazon

0,184 n,a. µg/l0,009MDPhChloridazon

60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory G



Recovery [%]

RecoveryDeviation

± U (k=2)


0,203 µg/l0,0102,4-D



<0,05 µg/lMCPA

0,064 0,076 0,020 119%µg/l0,003Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory G



Recovery [%]

RecoveryDeviation

± U (k=2)


0,250 µg/l0,0132,4-D



0,298 µg/l0,015MCPA

0,114 0,135 0,035 118%µg/l0,006Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory H



Recovery [%]

RecoveryDeviation

± U (k=2)


0,203 µg/l0,0102,4-D



<0,05 µg/lMCPA





60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory H



Recovery [%]

RecoveryDeviation

± U (k=2)


0,250 µg/l0,0132,4-D



0,298 µg/l0,015MCPA





60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory I



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,049 0,01 89%µg/l0,003Bentazone

0,203 0,404 0,08 199%µg/l0,0102,4-D


0,072 0,125 0,025 174%µg/l0,004Dichlorprop

<0,05 <0,01 •µg/lMCPA

0,064 0,093 0,018 145%µg/l0,003Mecoprop

0,098 0,103 0,021 105%µg/l0,005Chloridazon



60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory I



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,235 0,047 78%µg/l0,015Bentazone

0,250 0,543 0,109 217%µg/l0,0132,4-D



0,298 0,696 0,139 234%µg/l0,015MCPA

0,114 0,141 0,028 124%µg/l0,006Mecoprop

0,353 0,352 0,070 100%µg/l0,018Chloridazon



60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory J



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,06 0,02 109%µg/l0,003Bentazone

0,203 0,246 0,06 121%µg/l0,0102,4-D

0,154 0,240 0,06 156%µg/l0,008Dicamba

0,072 0,09 0,02 125%µg/l0,004Dichlorprop

<0,05 <0,05 0,02 •µg/lMCPA

0,064 0,09 0,02 141%µg/l0,003Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory J



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,263 0,07 88%µg/l0,015Bentazone

0,250 0,272 0,07 109%µg/l0,0132,4-D

0,280 0,294 0,07 105%µg/l0,014Dicamba

<0,05 <0,05 0,02 •µg/lDichlorprop

0,298 0,373 0,09 125%µg/l0,015MCPA

0,114 0,138 0,03 121%µg/l0,006Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory K



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,24 0,02 436%µg/l0,003Bentazone

0,203 0,25 0,02 123%µg/l0,0102,4-D

0,154 0,28 0,03 182%µg/l0,008Dicamba

0,072 0,10 0,02 139%µg/l0,004Dichlorprop

<0,05 <0,05 •µg/lMCPA

0,064 0,06 0,02 94%µg/l0,003Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory K



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,40 0,05 133%µg/l0,015Bentazone

0,250 0,30 0,02 120%µg/l0,0132,4-D

0,280 0,40 0,05 143%µg/l0,014Dicamba


0,298 0,36 0,02 121%µg/l0,015MCPA

0,114 0,10 0,02 88%µg/l0,006Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory L



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,063 115%µg/l0,003Bentazone

0,203 0,213 105%µg/l0,0102,4-D


0,072 0,077 107%µg/l0,004Dichlorprop

<0,05 <0,010 •µg/lMCPA

0,064 0,034 53%µg/l0,003Mecoprop

0,098 0,102 104%µg/l0,005Chloridazon


0,230 0,096 42%µg/l0,012MDPhChloridazon

60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory L



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,243 81%µg/l0,015Bentazone

0,250 0,216 86%µg/l0,0132,4-D



0,298 0,261 88%µg/l0,015MCPA

0,114 0,275 241%µg/l0,006Mecoprop

0,353 0,260 74%µg/l0,018Chloridazon


0,184 0,063 34%µg/l0,009MDPhChloridazon

60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory M



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,051 0,002 93%µg/l0,003Bentazone

0,203 0,219 0,022 108%µg/l0,0102,4-D


0,072 0,078 0,006 108%µg/l0,004Dichlorprop

<0,05 <0,01 •µg/lMCPA

0,064 0,063 0,005 98%µg/l0,003Mecoprop

0,098 0,095 0,008 97%µg/l0,005Chloridazon



60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory M



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,276 0,011 92%µg/l0,015Bentazone

0,250 0,254 0,026 102%µg/l0,0132,4-D



0,298 0,295 0,025 99%µg/l0,015MCPA

0,114 0,110 0,009 96%µg/l0,006Mecoprop

0,353 0,343 0,056 97%µg/l0,018Chloridazon



60

70

80

90

100

110

120

130

140


Sample HB87A

Laboratory N



Recovery [%]

RecoveryDeviation

± U (k=2)

0,055 0,048 0,005 87%µg/l0,003Bentazone

0,203 0,188 0,18 93%µg/l0,0102,4-D

0,154 0,103 0,01 67%µg/l0,008Dicamba

0,072 0,071 0,007 99%µg/l0,004Dichlorprop

<0,05 <0,02 •µg/lMCPA

0,064 0,063 0,006 98%µg/l0,003Mecoprop




60

70

80

90

100

110

120

130

140


Sample HB87B

Laboratory N



Recovery [%]

RecoveryDeviation

± U (k=2)

0,300 0,271 0,027 90%µg/l0,015Bentazone

0,250 0,229 0,023 92%µg/l0,0132,4-D

0,280 0,252 0,0252 90%µg/l0,014Dicamba


0,298 0,273 0,027 92%µg/l0,015MCPA

0,114 0,118 0,012 104%µg/l0,006Mecoprop




Date post:	28-Feb-2021
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Proficiency Testing Scheme for Water Analysis · contains the uncertainties of the target value....

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