Method 3500

Formaldehyde by Visible Absorption Spectrophotometry

This is the most sensitive formaldehyde method in the NIOSH Manual of Analytical Methods and is able to measure ceiling levels as low as 0.1 ppm (1 5-L sample). It is best suited for the determination of formaldehyde in area samples. The working range is 0.02 to 4 ppm (0.025 to 4.6 mg/m³) for an 80-L air sample. NOTE: This method was originally adapted from the Intersociety Committee and designated P&CAM 125.

(NIOSH Issue 2: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   30 days @ 25 °C in LDPE bottles
Preservatives:   25 °C
Required Preps:   1 um PTFE membrane filter and 2 impingers of 20 ml 1% sodium bisulfite solution
Collection Method:   Filter and impingers, 1-100 L @ 0.2-1 L/min
Analytical Methodology:   Visible Absorption Spectrometry
Documentation:   3500

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.