This method is used for the determination of cadmium and compounds as cadmium. The sample is collected on cellulose ester membrane filters, ashed in concentrated nitric acid @ 140 °C, followed by concentrated hydrochloric acid at 400 °C, and then analyzed by flame atomic absorption. The working range is 0.1 to 2 mg/m³ for a 25 L air sample, and 0.01 to 0.2 mg/m³ for a 250 L air sample. This is an elemental analysis and will not distinguish cadmium fume from cadmium dust. Aliquots of samples can be analyzed separately for many additional metals. NOTE: This method combines and replaces P&CAM 173, S312, S313. A similar method appears in the criteria document. Method 7300 (elements by ICP-AES) is an alternate, multielement measurement method with approximately the same sensitivity. Aliquots of the sample can be analyzed by graphite furnace AA with greatly increased sensitivity.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Stable |
| Preservatives: | Stable |
| Required Preps: | Cellulose ester membrane filter (0.8µm pore size). |
| Collection Method: | Filter: 25L - 1500L @ 1 to 3 L/min. |
| Analytical Methodology: | Flame Atomic Absorption. |
| Documentation: | 
7048
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Cadmium oxide | CdO |
1306-19-0 |
0.05 |
µg |
| Cadmium | Cd |
7440-43-9 |
0.05 |
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.