This method describes the collection and analysis of inorganic arsenic for airborne samples. Air samples can be taken for particulate and volatile inorganic arsenic. Inorganic arsenic particulate in the air is collected by drawing a known volume of the air through a mixed-cellulose ester (MCE) filter and a backup pad using a personal calibrated sampling pump. A chemically-treated backup pad is used if volatile inorganic arsenic species are suspected. If arsine is also suspected, a sampling train is used. Sample preparation at the laboratory involves mineral acid digestion and nickel stabilization. The analysis is performed with an atomic absorption spectrometer (AAS) utilizing a heated graphite atomizer (AAS-HGA). Additional analytes (Cd, Cu, Fe, Pb, and Zn) can also be analyzed from the sample media using flame AAS techniques. If volatile inorganic arsenic is suspected, the cellulose backup pads are chemically treated (with a sodium bicarbonate solution with glycerol) and the pads and MCE filters are contained in three-piece cassettes. This ensures capture of volatile inorganic arsenic in the backup pad. When arsine is suspected to be present, the above is used in series with a coconut shell charcoal glass arsine sampling tube, 400mg/200mg.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Not noted in method |
| Preservatives: | Not noted in method |
| Required Preps: | Mixed cellulose ester membrane filter (0.8µm pore size), cellulose backup pads, cassettes, and two- or three-piece cassettes, 37-mm diameter. |
| Collection Method: | Mixed Cellulose ester membrane: 480L @ 2L/min for MCE; 120L @ 0.5L/min for sampling train. |
| Analytical Methodology: | AAS-HGA (atomic absorption spectrometer-heated graphite atomizer) |
| Documentation: | 
ID-105
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Arsenic | As |
7440-38-2 |
0.01 |
µg/mL |
* 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.