This method is used for the determination of formaldehyde. The sample is collected on a cartridge containing silica gel coated with 2,4-dinitrophenylhydrazine, extracted with carbonyl-free acetonitrile, eluted through the cartridge, and analyzed by HPLC with UV detection. The working range is 0.021 to 2.5 mg/m³ for a 15 L air sample. This method can be used for the determination of formaldehyde for both STEL(short term exposure limit) and TWA (time weighted average) exposures. The analysis procedure in this method has also been used for detection of formaldehyde in automobile exhaust. NOTE: NIOSH Method 5700 uses similar analysis procedures. Other methods available for formaldehyde analysis include OSHA Method 52 and NIOSH Methods 3500 and 2541.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 14 days from samplling to analysis if kept at 4°C |
| Preservatives: | Store at 4°C. |
| Required Preps: | Cartridge: containing 0.35 g of silica gel coated with 0.9 mg of 2,4-dinitrophenylhydrazine |
| Collection Method: | Cartridge: 1 - 15 L @ 0.1 - 1.5 L/min. |
| Analytical Methodology: | HPLC, UV detection |
| Documentation: | 
2016
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Formaldehyde | CH2O |
50-00-0 |
0.09 |
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.