Skc limited warranty and return policy – SKC 500-100 UMEx 100 Passive Sampler for Formaldehyde User Manual
Page 4
Form 3760 Rev 1405
2. The formaldehyde 2,4-dinitrophenylhydrazone is detected with UV absorp-
tion between 230 and 370 nanometers (nm). Tunable UV detectors should
use 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 and then converting results to refl ect
concentration in formaldehyde. Use the following formula:
Concentration μg/ml formaldehyde = Concentration μg/ml hydrazone x 30.03
210.21
Where molecular weight of formaldehyde is 30.03
Where molecular weight of formaldehyde 2,4-dinitrophenylhydrazone is 210.21
4. Formaldehyde content of the blank/correction tape must always be subtract-
ed from the sample tape when calculating air concentrations.
5. Calculate the results by comparing the standards against the samples. Use
the following formulas to calculate:
Total mass collected (μg) = Concentration (μg/ml) x Desorption Volume (ml)
Volume of air (liters) = Time (minutes) x Sampling rate (28.6 ml/min
¥
)
1000
Concentration
(mg/m
3
) = Total mass collected (mg) x 1000
Total volume sampled
PPM in air = (24.45/30.03) x mg/m
3
‡ Other conditions may be acceptable.
¥ When calculating results from 7-day sampling, use a sampling rate of 20.4 ml/min.
* Limited shelf-life; storage at freezer temperatures (≤39.2 F [4 C]) required. Do not store with food.
Designed for single use only. Do NOT reuse UME
x
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 Lett 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
UME
x
Passive Samplers
Cat. No.
UME
x
100,* for formaldehyde and other aldehydes, pk/10
500-100
UME
x
200,* for sulfur dioxide and/or nitrogen dioxide, pk/10
500-200
UME
x
300,* for ammonia, pk/10
500-300
Accessory
Treated Tape, for QC purposes only, pk/50
P20084
Stand for Indoor Sampling
690-302
SKC Limited Warranty and Return Policy
SKC products are subject to the SKC Limited Warranty and Return Policy, which provides SKC’s
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