Formaldehyde Passive Sampler:  UMEx 100

The UMEX 100 Passive Sampler for formaldehyde was developed in collaboration with the National Institute of Working Life in Umea, Sweden. Constructed of tough polypropylene, the UMEX 100 contains a tape impregnated with 2,4-dinitrophenylhydrazine (DNPH) for reliable collection of formaldehyde.


Sampling Rate for Formaldehyde

28.6 ml/min with a RSD of 18% (for 15-min to 8-hrs or 24-hrs
20.4 ml/min (7 days)

See the Passive Sampling Guide for UMEX 100 sampling rates for other aldehydes.

Detection Principle Formation of stable DNPH (2,4 dinitrophenylhydrazine) in the presence of formaldehyde
Concentration Range 5 ppb to 5 ppm
Lower Detection Limits 15-min: 200 ppb (0.24 mg/m3)
8-hrs: 5 ppb (0.006 mg/m3)
24-hrs 2 ppb (0.002 mg/m3)
7 days 0.2 ppb (0.0002 mg/m3)
Shelf-life 12-mo from date of manufacture at < 39.2F (4C)
Capacity 29 µg/sample
Analysis Desorption of hydrazine and analysis by high-performance liquid chromatography (HPLC) with UV detection
Accuracy ± 25%, exceeds OSHA requirements
Storage Before use: < 39.2 F (4C)
After use: < 39.2 F (4C) and analyze within three weeks
Do not store with food.
Temperature Effects No effect on sampling rate between 10 and 30 C
Humidity Effects No effect from 10 to 80% relative humidity (RH)
Do not use sampler below 10% RH.
Wind Effects No effect from 0.05 to 1.0 m/s
good correlation at 0.02 m/s
Interferences Large amounts of carbonyl compounds may reduce the uptake of formaldehyde.
Use in ozone levels < 0.5 ppm.
Dimensions 3.4 x 1.1 x .35 in (8.6 x 2.8 x .89 cm)
Weight 0.38 oz (10.8 gm)

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