This method is used for the determination of formic acid. The sample is collected on a 5 micron PTFE membrane filter followed by a washed silica gel tube. After collection the sample is desorbed with deionized water and analyzed by ion chromatography with conductivity detection.
The working range of the method is 0.13 to 12 ppm (0.25 to 22 mg/m³) for a 24 L air sample.
NOTE: This method is a modification of NIOSH Method 7903 (acids, inorganic) and revises Method S173.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 1 week from sample collection to analysis if samples are kept at 25°C. |
| Preservatives: | Store samples at 25°C. |
| Required Preps: | 5 µm PTFE membrane (SKC 225-2708), Washed silica gel tube, 400 mg/200 mg (SKC 226-10-03) |
| Collection Method: | The method recommends a 0.05 - 0.2 L/min. flow rate and a 1 - 24L sample collection volume. |
| Analytical Methodology: | IC |
| Documentation: | 
2011
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Formic acid | CH2O2 |
64-18-6 |
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.