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
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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) |
|
Shelf-life
|
12 mos from date of manufacture at < 39.2 F ([4 C]) |
|
Capacity
|
29 µg/sample |
|
Analysis
|
Solvent extraction and analysis by HPLC (high-performance liquid chromatography) with UV detection |
|
Accuracy
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± 25%, exceeds OSHA requirements |
|
Storage
|
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
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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 |
|
Interferences‡
|
Large amounts of carbonyl compounds may reduce the uptake of formaldehyde.
Use in ozone levels < 0.5 ppm. |
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Dimensions
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3.4 x 1.1 x .35 in (8.6 x 2.8 x .89 cm) |
|
Weight
|
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. |
