This method is used for the determination of calcium and compounds as calcium. The sample is collected on cellulose ester membrane filters, ashed in concentrated nitric acid @ 140 °C followed by 60% (w/v) perchloric acid at 400 °C and then analyzed by flame atomic absorption. The working range is 1 to 20 mg/m³ for an 85 L sample. This is an elemental analysis, and not compound specific. Verify that the types of compounds in the samples are soluble with this ashing procedure. Aliquots of samples can be analyzed separately for many additional methods. NOTE: This method combines and replaces P&CAM 173 and S205. Method 7300 (ICP-AES) is an alternate.
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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: 20L - 400L @ 1 to 3 L/min. |
| Analytical Methodology: | Flame Atomic Absorption. |
| Documentation: | 
7020
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Calcium dihydroxide | H2CaO2 |
1305-62-0 |
0.01 |
mg |
| Calcium oxide | CaO |
1305-78-8 |
0.01 |
mg |
| Calcium Carbonate | 471-34-1 |
0.01 |
mg | |
| Calcium | Ca |
7440-70-2 |
0.01 |
mg |
* 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.