This method describes the breathing zone sampling and laboratory analysis of workplace personnel for occupational exposure to phosphine. Collected samples are analyzed by ion chromatography. Samples are collected using a calibrated sampling pump and a glass tube containing beaded carbon impregnated with potassium hydroxide. A humidification device may also be used in front of the sorbent tube. Sampling media is desorbed in 30% hydrogen peroxide and analyzed as phosphite by ion chromatography. If sampling in low relative humidity (<40% RH) areas, an in-line humidifier is necessary. The humidifier can be used regardless of humidity levels and if used, eliminates the need to measure humidity.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Analyze samples within 12 days after collection. |
| Preservatives: | Samples should be refrigerated to increase stability. |
| Required Preps: | Glass tube containing beaded carbon impregnated with potassium hydroxide (17cm x 5mmOD). A humidification device may also be used in front of the sorbent tube (11cm x 9mmOD); 1.5g treated sorbent. |
| Collection Method: | Glass sampling tube with beaded carbon: 36L @ 0.05-0.15L/min (TWA) and 36L @ 0.3L/min (STEL). |
| Analytical Methodology: | Ion Chromatography. |
| Documentation: | 
ID-180
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Phosphine | H3P |
7803-51-2 |
0.015 |
ppm |
* 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.