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Performance Profi le
Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
Tel: 724-941-9701 • www.skcinc.com
Passive Sampler for Formaldehyde
Cat. No. 500-100
Sampling Rate:
Validation Range:
Detection Principle:
Analysis Method:
Lower Detection Limits:
Shelf-life:
Storage:
Capacity:
Accuracy:
Temperature Effects:
Humidity Effects:
Wind Velocity Effects:
Interferences:*
Dimensions:
Weight:
* If sampling in an atmosphere containing formalin, see www.skcinc.com/instructions/1795.pdf for fi eld study information.
28.6 ml/min with a relative standard deviation of 7.6% at a wind velocity of
5 to 100 cm/sec for 15 min to 24 hrs
20.4 ml/min wind velocities < 5 cm/sec for 1 to 7 days
See the Passive Sampling Guide at www.skcinc.com for UME
0.06 to 3.0 ppm
Formation of stable DNPH-hydrazone in the presence of formaldehyde*
Solvent extraction and analysis by HPLC (high-performance liquid chromatography) with UV detection
3
15 min: 200 ppb (0.24 mg/m
8 hr: 5 ppb (0.006 mg/m3)
24 hr: 2 ppb (0.002 mg/m3)
7 days: 0.2 ppb (0.0002 mg/m
12 mos from date of manufacture at ≤ 39.2 F (4 C)
Before use: ≤ 39.2 F (4 C)
After use: ≤ 39.2 F (4 C) and analyze within 3 wks
29 μg/sample
± 25%, exceeds OSHA requirements
No eff ect on sampling rate between 10 and 30 C
No eff ect from 10 to 80% relative humidity (RH). Do not use sampler below 10% RH.
No eff ect from 5 to 100 cm/sec
• Highly specifi c for formaldehyde. Large amounts of carbonyl compounds may reduce the uptake of formaldehyde
• Use in ozone levels < 0.5 ppm
3.4 x 1.1 x 0.35 in (8.6 x 2.8 x 0.89 cm)
0.38 oz (10.9 gm)
)
3
)
x
100 sampling rates for other aldehydes.
Description
The UMEx 100 Passive Sampler for Formaldehyde has a green sliding cover that opens and closes easily to start and stop sampling. Because
of its relatively high sampling rate and sensitive analysis, the UMEx 100 can be used for 15-minute (STEL) sampling in the ppm range,
personal monitoring up to 12 hours, and 24-hour to 7-day monitoring of contaminants found in indoor environments.
Sampling
• UMEx samplers are designed for single use only. Do NOT reuse UMEx samplers.
• Do not use Sharpie® markers or equivalent to mark label or pouch as these can off-gas VOCs.
1. Open the pouch and remove the sampler. Do not discard the
pouch as it is used to protect the sampler during shipment
to the laboratory. Store the pouch away from potential
formaldehyde sources. Note: Inside the pouch is a small length
of tape similar to the tape inside the sampler. This tape protects
the background of the sampler should any formaldehyde in the
atmosphere enter the pouch. Leave the tape inside the pouch at all
times and send along with the sample to the laboratory.
2. Write the date, location, and
sample start time on the label on
the back of the sampler.
500-100
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 (diff usion plate
exposed) to begin sampling.
5. After sampling for the desired
time, slide the sampler cover
to the “off ” position (diff usion
plate covered) to stop sampling.
6. Enter the sample stop time on
the label on the back of the
sampler.
7. Immediately place the sampler
in the original pouch and
seal the pouch. Send it, along
with pertinent information,
to an accredited laboratory
for analysis. Use expedited
shipping.
Analysis
Desorption
1. Remove the sampler from the pouch and the sliding cover from the sampler. Use forceps (cleaned with acetonitrile)
to lift out the reactive tape from each section. Note: The blank tape has an indentation for easy identifi cation. Place each
one in a sealed vial. This provides a sample and a blank.
Note: It is also acceptable to use a "lot" blank to correct for background. One lot blank is included in each box of badges.
2. Desorb the formaldehyde 2,4-dinitrophenylhydrazone from both the sample and blank tapes by placing each
one in its own 4-ml glass vial containing 3 ml of acetonitrile and shaking them by hand for one minute.
Calculations
1. A 10-μl portion of the solution resulting from Step 2 above is subjected to HPLC determination using an
octadecylsilane column and a mobile phase consisting of 33% water in methanol.
2. The formaldehyde 2,4-dinitrophenylhydrazone is detected with UV absorption at 365 nm for optimum
results. Detection limit depends on instrument sensitivity.
3. Quantitative analysis is performed using the synthesized formaldehyde hydrazone as an external standard
‡
Reactive tape
(blank)
and then converting results to refl ect concentration in formaldehyde:
Concentration μg/ml formaldehyde = Concentration μg/ml hydrazone x 30.03
210.21
Where:
Molecular weight of formaldehyde = 30.03
Molecular weight of formaldehyde 2,4-dinitrophenylhydrazone = 210.21
4. Formaldehyde content of the blank tape must always be subtracted from the sample tape when calculating air concentrations.
5. Calculate the results by comparing the standards against the samples:
Total mass collected (μg) = Concentration (μg/ml) x Desorption volume (ml)
Volume of air (liters) = Time (minutes) x Sampling rate (28.6 ml/min)
Concentration (mg/m
3
) = Total mass collected (mg) x 1000
1000
¥
Total volume sampled
PPM in air = (24.45/30.03) x mg/m
‡ Other conditions may be acceptable.
¥ When calculating results from 7-day sampling, use a sampling rate of 20.4 ml/min.
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Diffusion plate
Reactive tape (sample)
Body
Sliding
cover
Ordering Information
Description Cat. No.
UMEx 100,* for formaldehyde and other aldehydes, pk/10 500-100
Accessories
Treated Tape, for QC purposes only, pk/50 P20084
Stand for Area Sampling 690-302
* Limited shelf-life; storage at ≤39.2 F (4 C) required. Designed for single use only. Do NOT reuse UMEx samplers.
References
Levin, J.O. and Lindahl, R., “Diff usive Air Sampling of Reactive Compounds - A Review,” Analyst, Vol. 119, Jan. 1994, pp. 79-83
Levin, J., et al., “High-performance Liquid Chromatographic Determination of Formaldehyde in Air in the Ppb and Ppm range Using Diff usive
Sampling and Hydrazone Formation,” Sweden Environ. Technology Le er 9, 1988, pp. 1423-1430
OSHA Method 1007 Formaldehyde (Diff usive Samplers), May 2005
Levin, J. O., Lindahl, R., and Andersson, K., “A Passive Sampler for Formaldehyde in Air Using 2,4-Dinitrophenylhydrazine-coated Glass Fiber Filters,”
Environmental Science and Technology, Vol. 20, No. 12, 1986, pp. 1273-1276
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.
Form 3760 Rev 1901
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