This method describes the collection of airborne formaldehyde in the breathing zone of workplace personnel and the subsequent analysis of those samples using a colorimetric technique. Samples are collected on a passive badge monitor containing bisulfite-impregnated paper. A modified chromotropic acid procedure is used. Sample filters are desorbed using deionized water. Solutions are acidified, and chromotropic acid is added. The color complex formed is analyzed using a UV spectrophotometer at 580 nm.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The collected formaldehyde sample is stable for at least 30 days. |
| Preservatives: | None noted in method. |
| Required Preps: | Passive monitor |
| Collection Method: | Passive monitor: 8 hours @ 0.0614 ± 0.005 L/min. |
| Analytical Methodology: | UV Spectrophotometer. |
| Documentation: | 
ID-205
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Formaldehyde | CH2O |
50-00-0 |
2 |
µg |
* 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.