Restek Air

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Versatile, High-Performing radiello Passive Air Samplers • 3D radial design outperforms 2D axial samplers.

• Excellent low-level detection, even in short sampling times.

• High capacity ensures accurate long-term sampling.

• Easy to use—no pump required.

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Versatile, High-Performing radiello Passive Air SamplersNow available from Restek, radiello passive diffusive air samplers feature a unique 3D radial design that provides several performance advancements compared to standard 2D flat axial air samplers. These samplers are a reliable, cost-effective alternative that offers both high sensitivity for low-level detection in short sampling periods, as well as higher capacity so accurate results can be obtained over longer sampling times. Versatile radiello air samplers are available for a wide range of chemical classes, so the choice of sampling material can be tailored to specific applications.

What Makes It Better?The 3D cylindrical, coaxial design of radiello passive air samplers creates a large diffusive surface at a fixed, uniform distance from an adsorbent center column. Air enters from all sides and analytes are trapped on the large inner adsorptive surface. This results in a much higher sample uptake rate and capacity compared to standard 2D flat axial samplers.

Diffusive Surface

Adsorbing Surface

sample uptake

sample uptake

sample uptake

sample uptake

• Higher sample uptake rate provides ppbv sensitivity in short sampling periods.

• Higher capacity for more accurate long-term monitoring.

• Easy to use—no pump required.

• Not affected by face velocity.

The radiello Advantage

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• Unique 3D radial design is not prone to face velocity effects and delivers higher uptake rates than standard 2D flat axial devices.

• Higher uptake rates give excellent low-level sensitivity, even for short sampling periods (down to 15 min).

• Higher capacity allows you to sample accurately up to 30 days without bias from breakthrough or back diffusion.

• Versatile, easy-to-use air sampler for a wide range of chemical classes is ideal for environmental monitoring, vapor intrusion, industrial hygiene, and personal air sampling.

• Solvent and thermal desorption options available.

• Features water repellant diffusive body and reusable holders.

• Easy to use—no pump required.

Why Use radiello Air Samplers?

Unique 3D Radial Design Means radiello Air Samplers Have a Much Higher Sample Uptake Rate than 2D Axial Samplers.

Compound3D Radial radiello Sampler

Uptake Rate (mL/min)2D Axial Sampler

Uptake Rate (mL/min)

Methanol 125 NS

Ethanol 102 44

Acetone 77 40

Benzene 80 36

Methyl ethyl ketone 79 36

Toluene 74 31

Ethylbenzene 68 27

n-Octane 53 27

Naphthalene 25 25

NS – Not suitable

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Higher Sample Uptake Rates Mean High Sensitivity and Good Low-Level Detection, Even in Short Sampling Periods

• Increased response for all compounds compared to axial samplers.

• Average increase in response of 163% for the 8 compounds shown below.

• Excellent reproducibility with an average RSD of 5.6%

The radiello Advantage

radiello Samplers Have Higher Capacity than Axial Samplers, so You Can Report Accurate Results over Long Sampling Periods

Met

hylen

e chlo

ride

Acet

one

Chlor

ofor

mTe

trahy

drof

uran

2-Bu

tano

ne (M

EK)

Benz

ene

Tolue

ne

p-Xy

lene

radiello 130 Sampler Axial Sampler

Peak

Are

a Re

spon

se

0.0E+00

5.0E+04

1.0E+05

1.5E+05

2.0E+05

2.5E+05

Three 8-hour samples were collected in a shipping facility with a radiello 130 air sampler and a traditional flat axial air sampler. Samples were extracted with 2 mL of carbon disulfide and analyzed by GC-FID. Error bars represent standard deviations.

Met

hylen

e chlo

ride

Acet

one

Chlor

ofor

mTe

trahy

drof

uran

2-Bu

tano

ne (M

EK)

Benz

ene

Tolue

ne

p-Xy

lene

radiello 130 Sampler Axial Sampler

Peak

Are

a Re

spon

se

0.0E+00

5.0E+04

1.0E+05

1.5E+05

2.0E+05

2.5E+05M

ethy

lene c

hlorid

e

Acet

one

Chlor

ofor

mTe

trahy

drof

uran

2-Bu

tano

ne (M

EK)

Benz

ene

Tolue

ne

p-Xy

lene

radiello 130 Sampler Axial Sampler

Peak

Are

a Re

spon

se

0.0E+00

5.0E+04

1.0E+05

1.5E+05

2.0E+05

2.5E+05

In active sampling using a vacuum pump, the phenomenon of “breakthrough” occurs when the analyte band begins to move out of the adsorbent bed. If the concentration of analyte in the outlet air exceeds 10% of the concentration in the sampled air, any further pumping leads to analyte loss and an underrepresentation of the true environmental concentration. A similar situation, called “back diffusion,” occurs with diffusion sampling. Although, radiello air samplers can exhibit back diffusion, the high capacity of these devices allows much higher sample volumes to be processed before this effect is observed.

In this comparison, benzene is actively sampled (pumped) onto an activated charcoal adsorbent and also diffusively sampled using a radiello 130 sampler (both at 25 °C). For the pumped charcoal adsorbent (solid lines), breakthrough is reached at 35, 44, and 49 L when the benzene concentration is 100, 50, and 10 µg/m³, respectively. Whereas, for the radiello sampler (dotted lines) back diffusion does not occur until 1600, 2300, and 3050 L at the same concentrations.

100

10000 2000 3000 4000

80

60

40

20

0

µg.m

³ flo

win

g ou

t

breakthroughback-diffusion air (liters)

pumpedsamplers

100 µg.m³

50 µg.m³

10 µg.m³

35 1600 230044

49 3050

radiello

mQ

¹t

¹radiello

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Time (min)

2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00

12

3

4

5

6

7

8

9

10

70 ppbv

GC_AR1170

Time (min)

2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00

1 23

45

6

7

8

9

10

1112

1.8 ppbv

GC_AR1171

Example Applications: radiello 145The radiello 145 (RAD145) air sampler is designed specifically for airborne volatile organic compounds (VOCs). The 3D radial, diffusive design provides much higher uptake rates and more capacity than standard 2D flat axial, diffusive samplers. The higher sample uptake rate means that ppbv levels of VOCs can be detected in very short sampling times.

4-Hr Shipping Facility Air Sample with radiello 145

Peaks 1. Propene 2. 2-Methyl-1-propene 3. Acetaldehyde 4. 2-Methylbutane 5. Pentane 6. Furan 7. Methylene chloride 8. Hexane 9. Acetonitrile 10. Benzene 11. Toluene 12. Chlorobenzene

16-Hr Laboratory Air Sample with radiello 145

Peaks 1. Propene 2. 2-Methyl-1-propene 3. Acetaldehyde 4. Acetone 5. Hexane 6. Butanal 7. Acetic acid 8. Toluene 9. D-Limonene 10. Benzaldehyde

Column: Rtx-VMS, 60 m, 0.25 mm ID, 1.40 µm (cat.# 19916) with MXT low-dead-volume connector (cat.# 20536); Injection: on-column; Oven: Oven Temp.: 40 °C (hold 7 min) to 250 °C at 30 °C/min (hold 2 min); Carrier Gas: He, constant flow; Flow Rate: 2.0 mL/min; Detector: MS; Mode: Scan; Start Time: 8.80 min; Scan Range: 38 amu; Scan Rate: 226 scans/sec; Transfer Line Temp.: 250 °C; Analyzer Type: Quadrupole; Source Type: Extractor; Extractor Lens: 6 mm ID; Source Temp.: 230 °C; Quad Temp.: 150 °C; Electron Energy: 70 eV; Tune Type: BFB; Ionization Mode: EI; Preconcentrator: Markes Unity; Trap 1 Settings: Type/Sorbent : radiello 145; Desorb temp.: 350 °C; Desorb flow: 50 mL/min; Desorb time: 300 sec; Trap 2 Settings: Type/Sorbent: Air Toxics; Cooling temp.: 30 °C; Desorb temp.: 310 °C; Desorb time: 3 sec; Instrument: Agilent 7890B GC & 5977A MSD; Notes: The radiello 145 passive air sampler (RAD145) utilizes a stainless steel net cartridge packed with 350 mg of graphitized charcoal (Carbograph 4). Airborne volatile organic compounds (VOCs) were adsorbed to the charcoal and then thermally desorbed and analyzed by GC-MS. Trap 1 conditions were used for radiello desorption. Trap 2 conditions were used for Unity desorption.

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Example Applications: radiello 165Monitoring airborne carbonyls (aldehydes and ketones) is important for protecting human and environmental health. A radiello 165 (RAD165) passive sampler is ideal for collecting these compounds from either indoor or outdoor air. The 3D radial design ensures high sample uptake rates, allowing ppbv level detection. The large capacity allows for longer sampling periods to be used when desired.

16-Hr Laboratory Air Sample with radiello 165

Time (min)

1

0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00

-0.006

-0.004

-0.002

0.000

0.002

0.004

0.006

0.008

0.010

0.012

0.014

0.016

0.018

0.020

0.022

0.024

0.026

Minutes3.00 3.10 3.20 3.30 3.40 3.50 3.60 3.70 3.80 3.90 4.00 4.10 4.20 4.30 4.40 4.50 4.60 4.70

0.0025

0.0030

0.0035

0.0040

0.0045

0.0050

0.0055

0.0060

0.0065

0.0070

0.0075

0.0080

0.0085

0.0090

0.0095

0.0100

0.0105

0.0110

0.0115

0.0120

Minutes6.20 6.40 6.60 6.80 7.00 7.20 7.40 7.60 7.80 8.00 8.20 8.40 8.60 8.80 9.00 9.20 9.40 9.60 9.80 10.00 10.20

3

2

4

5

LC_AR0508

tR Peaks (min) 1. Formaldehyde-DNPH 2.80 2. Acetaldehyde-DNPH 3.47 3. Acetone-DNPH 4.55 4. n-Butyraldehyde-DNPH 6.58 5. Hexanal-DNPH 10.10

radiello air samplers are available for a wide range of chemical classes.See our selection for the best choice for your application!

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Column: Raptor C18 (cat.# 9304A65); Dimensions: 150 mm x 4.6 mm ID; Particle Size: 2.7 µm; Pore Size: 90 Å; Temp.: 30 °C; Diluent: 2 mL acetonitrile extract; Inj. Vol.: 5 µL; Mobile Phase: ; A: Water; B: Methanol:acetonitrile (650:50)*; Gradient (%B): 0.00 min (70%), 5.00 min (75%); 11.00 min (90%); 11.01 min (100%); 12.00 min (100%); 12.01 min (70%); 14.00 min (70%); Flow: 0.8 mL/min; Detector: UV/Vis @ 365, 4.8 nm; Preconcentrator: radiello 165; Instrument: Waters ACQUITY UPLC H-Class; Notes: The radiello 165 passive air sampler (RAD165) utilizes a stainless steel net cartridge filled with 2,4-dinitrophenylhydrazine (DNPH) coated Florisil adsorbent. Airborne carbonyls react with the DNPH to form stable hydrazones. The derivatives were subsequently extracted for 30 minutes with 2 mL of acetonitrile. The extract was then analyzed by LC-UV. *Mobile phase B was prepared by combining 650 mL methanol and 50 mL acetonitrile.

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Description qty. cat.#

Samplers and Diffusive Bodies

White diffusive body for general use 20-pk. RAD120 Blue diffusive body (same as white, but opaque to light) 20-pk. RAD1201 Yellow diffusive body (for thermal desorption cartridge RAD145) 20-pk. RAD1202 Permeative body for anesthetic gases/vapors 20-pk. RAD1203 Sterile sampler for anesthetic gases and vapors 10-pk. RAD125 radiello cart. VOCs CS2 desorption SS net (100 mesh, 5.9 mm dia), activated charcoal (35-50 mesh) 20-pk. RAD130 Starter kit: 1 complete sampler for BTEX/VOCs, CS2 desorption, white diffusive body, cartridge + blank, support plate, adaptor kit RAD130S radiello cart. Anesthetic gases/vapors SS net w/mix of mol sieve & activated charcoal (35-50 mesh) 20-pk. RAD132 radiello cart. Thermal desorption SS net (3 x 8 µm mesh, 4.8 mm dia), 350 mg Carbopack X (40-60 mesh) 20-pk. RAD141 Starter kit: 1 complete sampler for 1,3-butadiene & isoprene, thermal desorption, yellow diffusive body, cartridge + blank, support plate, adaptor kit RAD141S

radiello cart. VOCs thermal desorption SS net (3 x 8 µm mesh, 4.8 mm dia), 350 mg Carbograph 4 (40-60 mesh) 20-pk. RAD145 Starter kit: 1 complete sampler for BTEX/VOCs, thermal desorption, yellow diffusive body, cartridge + blank, support plate, adaptor kit RAD145S radiello cart. Phenol, methylphenol and dimethylphenol TD - SS net (100 mesh, 4.8 mm dia), 250 mg Tenax-TA 20-pk. RAD147 radiello cart. Aldehydes SS net w/ 2,4-DNPH coated Florisil 20-pk. RAD165 radiello cart. HF, NO2, & SO2- microporous PE coated w/ wet TEA 20-pk. RAD166 radiello cart. NH3 microporous PE impregnated w/ phosphoric acid 20-pk. RAD168 radiello cart. HCl SS net w/ silica gel (0.1-0.4 mm particle size) 20-pk. RAD169 radiello cart. H2S microporous PE impregnated with zinc acetate 20-pk. RAD170 Starter kit: 1 complete sampler for H2S, white diffusive body, cartridge + blank, support plate, adaptor kit RAD170S radiello cart. Ozone microporous PE tube with silica gel coated with 4,4' dipyridylethylene 20-pk. RAD172

Sampler Accessories

Triangular support plates 20-pk. RAD121 Vertical adaptors for personal sampling 20-pk. RAD122 Vertical snap ring adaptors for ready-to-use sampler 20-pk. RAD1221 Polycarbonate caps for ready-to-use sampler 20-pk. RAD1241 Polypropylene containers for ready-to-use sampler 20-pk. RAD1242 Empty glass tubes with stopper, 2.8 mL 100-pk. RAD1991 Empty plastic tubes with stopper, 12 mL 100-pk. RAD1992

Electronic Devices

Thermometer Kit (3x RAD122 with Thermometer) 3-pk. RAD126 Thermometer Kit (3x RAD1221 with Thermometer) 3-pk. RAD1261 Thermometer reader ea. RAD127

Sampler Housing

Clips to suspend triangular plates 20-pk. RAD195 Outdoor sampling shelter 10-pk. RAD196 Strips to suspend outdoor shelter 100-pk. RAD198

RAD121RAD1202

RAD141

RAD120

RAD130

radiello Passive Diffusive Air Samplers—Now Available from Restek

RAD1201

RAD1203

RAD122

RAD1221

RAD1241

RAD1242

RAD195

RAD168

RAD132

RAD1992

RAD170

RAD1991

Questions? Contact us or your local Restek representative (www.restek.com/contact-us).Restek patents and trademarks are the property of Restek Corporation. (See www.restek.com/Patents-Trademarks for full list.) Other trademarks in Restek literature or on its website are the property of their respective owners. Restek registered trademarks are registered in the U.S. and may also be registered in other countries. To unsubscribe from future Restek communications or to update your preferences, visit www.restek.com/subscribe To update your status with an authorized Restek distributor or instrument channel partner, please contact them directly.

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