This method describes the collection and analysis of inorganic arsenic for wipe samples. Wipe materials are collected using grab sampling techniques. Sample preparation at the laboratory involves mineral acid digestion and nickel stabilization. Wipes are digested with nitric acid and stabilized by addition of nickel. After digestion, a small amount of hydrochloric acid is added. Arsine collected on charcoal is extracted using a dilute nitric acid/nickel solution. All samples are then diluted to volume and 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.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Not noted in method |
| Preservatives: | Not noted in method |
| Required Preps: | Smear tabs |
| Collection Method: | Wipe surface area covering at least 100 cm². |
| Analytical Methodology: | AAS-HGA (atomic absorption spectrometer-heated graphite atomizer) |
| Documentation: | 
ID-105
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Arsenic | As |
7440-38-2 |
0.25 |
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.