SKC 500-200 User Manual

Operating Instructions

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863 Valley View Road, Eighty Four, PA 15330 USA

Passive Sampler for Sulfur Dioxide

Cat. No. 500-200

Performance Profi le

Sampling Rate: 15.2 ml/min with a relative standard deviation of 16.5%

Validated Concentration
Range: 0.4 to 8 ppm, 15 minutes to 24 hours

Analysis Method: Solvent extraction and IC analysis with conductivity detection

Lower Detection Limits: 15 minutes: 170 ppb
8 hours: 5.3 ppb

Collection Method: Tape treated with triethanolamine (TEA); built-in blank

Shelf-life: 18 months from date of manufacture at ambient temperature

Storage: Before use: Ambient temperature

After use: Analyze within 3 weeks. Can be stored at ambient

Accuracy: ± 30%

Temperature Effects: No effect on sampling rate from 20 to 25 C

Humidity Effects: No effect from 20 to 80% relative humidity (RH)

Wind Velocity Effects:

Interferences: None identifi ed

Dimensions: 3.4 x 1.1 x 0.35 in (8.6 x 2.8 x 0.89 cm)

Weight: 0.38 oz (10.9 gm)

Slide Cover: Yellow

24 hours: 1.8 ppb

included

temperature or at ≤ 39.2 F (4 C)

No effect from 5 to 100 cm/sec

Note: NO2 can be analyzed on the same UMEx 200 Sampler as SO2.

Sampling Instructions

Cautions: • Do not store with food.

• Before sampling, check the expiration date on the label on the

• SKC recommends using gloves when handling chemically

• UMEx samplers are designed for single use only. Do NOT reuse

1. Open the aluminized pouch and remove the sampler. Do not discard the pouch;

use it to send sampler to the laboratory. Store the pouch away from potential

sulfur dioxide sources.

2. Enter date and location in the space provided on the back of the sampler.

3. Position the sampler on a worker’s collar for personal sampling or in an
appropriate location for area sampling.

4. Slide the sampler cover to the “on” position to begin sampling. Enter the sample
start time in the space provided on the back of the sampler.

5. A er sampling for the desired time, up to 24 hours, slide the sampler cover
to the “off ” position to stop sampling. Enter the sample stop time in the space
provided on the back of the sampler.

6. Place the sampler in the original pouch immediately a er sampling.

outside of the pouch. Do not use a er the last day of the month
indicated.

treated media.

x

UME

samplers.

7. Seal the pouch. Send pertinent information and sample to an accredited
laboratory for analysis.

Analysis Instructions for Sulfur Dioxide

Calibration Standards - Sulfate

Purchase commercially available sulfate standards appropriate for your application.
Prepare a range of sulfate standards in de-ionized ultra-fi ltered (DIUF) water and
prepare as outlined in Sample Preparation. Note: Standards for sulfur dioxide

require a 1:1 dilution with 0.15% hydrogen peroxide.

Sample Preparation for Sulfur Dioxide

1. Remove the sampler from the pouch and the sliding cover from the sampler.

2. Use clean forceps to li out the reactive tape from each section. Place each
section in a sealed vial. This provides a sample and a blank/correction.

Note: The blank/correction section of tape has an indentation for easy identifi cation.

3. Sulfate is desorbed from both the sample and the blank/correction tapes by
inserting each in its own 4-ml glass vial containing 2 ml of de-ionized DIUF
water and placing them on a vibrator/shaker for 20 minutes.

4. Pipe e 1 ml of extract into a vial and dilute
with 1 ml of 0.15% hydrogen peroxide. Shake
well for analysis of sulfur dioxide.

5. If also analyzing for NO

,§ transfer the

2

remaining 1 ml of extract to an auto-sampler
vial for analysis of nitrogen dioxide.

§ Sampling rate for NO2 is 17.3 ml/min.

Collar clip

Reactive tape (sample)

Diffusion plate

Body

Reactive tape
(blank/correction)

Sliding
cover

Sulfur Dioxide Sample Analysis

1. The sample extracts are analyzed for sulfate by ion chromatography with
conductivity detection.

2.

A 20 microliter portion of the extract is injected onto a Dionex 4 x 250 mm AS14A
column and with an 8.0/1.0 mM sodium carbonate/sodium bicarbonate eluent.

3. Calculate the sulfate results by comparing against a standard calibration curve.

4. Convert the results from sulfate to sulfur dioxide using the following formula:

Concentration μg/ml sulfur dioxide = Concentration μg/ml sulfate x (64.1/96.1)

Where 64.1 is the molecular weight of sulfur dioxide and
Where 96.1 is the molecular weight of sulfate

5. Total mass of sulfur dioxide is calculated below:

Concentration sulfur dioxide (μg/ml) x Desorption volume (2 ml)

6. The sulfur dioxide of the blank/correction tape must always be subtracted from
the sample tape when calculating air concentrations.

7. Calculate the air concentration in ppm using the following equations:

Volume of air (liters) = Time (minutes) x Sampling rate (15.2 ml/min )

1000

Concentration (ppm) = Mass (mg) x 24450
Air volume (L) x Molecular weight (64.1)

UMEx Passive Samplers

x

UME

200,*† for sulfur dioxide and/or nitrogen dioxide, pk/10

x

UME

100,*†‡ for formaldehyde and other aldehydes, pk/10

* Limited shelf-life † Do not store with food. ‡ Storage at ≤39.2 F (4 C) required

x

# UME

passive samplers are designed for single use only. Do NOT reuse UMEx samplers.

#

Catalog No.
500-200
500-100

SKC Limited Warranty and Return Policy

SKC products are subject to the SKC Limited Warranty and Return Policy, which
provides SKC’s sole liability and the buyer’s exclusive remedy. To view the complete
SKC Limited Warranty and Return Policy, go to h p://www.skcinc.com/warranty.asp.

Form 40108 Rev 1404