This method describes the sample collection and analysis of airborne tungsten (W) and cobalt (Co). An air sample is collected on a 37-mm mixed-cellulose ester (MCE) filter using a calibrated sampling pump and a 37-mm sampling cassette. Wipe and bulk samples can also be taken. The MCE filter is subjected to a sequence of digestion steps using ammonium hydroxide (aqueous ammonia), water, hydrochloric acid, nitric acid, and phosphoric acid. The resulting solution is analyzed by aspiration into the argon stream of an inductively coupled plasma atomic emission spectrometer (ICP-AES).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None noted in method. |
| Preservatives: | None noted in method. |
| Required Preps: | Mixed-cellulose ester (MCE) filters (0.8-µm pore size). |
| Collection Method: | Mixed cellulose ester filter: 480L (TWA) @ 2L/min; 30L (STEL) @ 2L/min. |
| Analytical Methodology: | ICP-AES |
| Documentation: | 
ID-213
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Tungsten | W |
7440-33-7 |
2.1 |
µg |
| Cobalt | Co |
7440-48-4 |
0.16 |
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.