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Sampling Rate for Formaldehyde
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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 days
See the More Information tab for UMEx 100 sampling rates for other aldehydes.
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Detection Principle
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Formation of stable DNPH-hydrazone in the presence of formaldehyde |
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Validation Range
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0.06 to 3.0 ppm |
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Lower Detection Limits
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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) |
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Shelf-life
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12 mos from date of manufacture at < 39.2 F ([4 C]) |
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Capacity
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29 µg/sample |
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Analysis
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Solvent extraction and analysis by HPLC (high-performance liquid chromatography) with UV detection |
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Accuracy
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± 25%, exceeds OSHA requirements |
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Storage
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Before use: < 39.2 F ([4 C])
After use: < 39.2 F ([4 C]) and analyze within 3 weeks
Do not store with food. |
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Temperature Effects
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No effect on sampling rate between 10 and 30 C |
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Humidity Effects
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No effect from 10 to 80% relative humidity (RH)
Do not use sampler below 10% RH. |
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Wind Effects
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No effect from 5 to 100 cm/sec |
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Interferences‡
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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) |
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Weight
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0.38 oz (10.8 gm) |