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Passive Samplers UMEx 100 for Formaldehyde

The convenient UMEx 100 Passive Sampler features sensitive method-validated chemistry for detection of low levels of formaldehyde. The single-use UMEx 100 contains a tape treated with 2,4-dinitrophenylhydrazine (DNPH) for reliable collection. Sampling rates are validated from 15 minutes to 24 hours or 7 days. Analysis is performed by high-performance liquid chromatography (HPLC).

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Performance Profile

Sampling Rate for Formaldehyde
28.6 ml/min with a RSD of 7.6% at wind velocity of 5 to 100 cm/sec for 15 minutes to 24 hours
20.4 ml/min at wind velocities < 5 cm/sec for 1 to 7 daysSee the More Information tab for UMEx 100 sampling rates for other aldehydes.
Detection Principle
Formation of stable DNPH-hydrazone in the presence of formaldehyde
Validation Range
0.06 to 3.0 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)
12 mos from date of manufacture at < 39.2 F ([4 C])
29 µg/sample
Solvent extraction and analysis by HPLC (high-performance liquid chromatography) with UV detection
± 25%, exceeds OSHA requirements
Before use: < 39.2 F ([4 C])
After use: < 39.2 F ([4 C]) and analyze within 3 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 5 to 100 cm/sec
Large amounts of carbonyl compounds may reduce the uptake of formaldehyde.

Use in ozone levels < 0.5 ppm.

3.4 x 1.1 x .35 in (8.6 x 2.8 x .89 cm)
0.38 oz (10.8 gm)
Note: If sampling in an atmosphere containing formalin, see Sampling Formaldehyde from Formalin Using Passive Samplers for field study information.
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