This method is used for the determination of chromium and compounds as chromium. The sample is collected on cellulose ester membrane filters, ashed in concentrated hydrochloric acid @ 140 °C followed by concentrated nitric acid at 400 °C, and then analyzed by flame atomic absorption. The working range is 0.05 to 2.5 mg/m³ for a 100 L sample. This is an elemental analysis for total chromium, and not compound specific. Some compounds of chromium may not be dissolved by this method. Aliquots of samples can be analyzed separately for approximately four additional methods. NOTE: This method combines and replaces P&CAM 173, P&CAM 152, S323, S352. Method 7300 (elements by ICP-AES) is an alternate analytical method. Hexavalent chromium, sampled on PVC filter, may be determined colorimetrically by M7600/M7604.
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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: 10L - 1000L @ 1 to 3 L/min. |
| Analytical Methodology: | Flame Atomic Absorption. |
| Documentation: | 
7024
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Chromium(III) Ion | 16065-83-1 |
0.06 |
µg | |
| Chromium(II) Ion | 22541-79-3 |
0.06 |
µg | |
| Chromium | Cr |
7440-47-3 |
0.06 |
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.