This method is specific for amorphous silica in crystalline (e.g., quartz) matrices in the range 1 to 10 mg/m³ for a 200-L air sample. Amorphous silica usually contains some crystalline silica. Samples are collected using a filter or a cyclone and filter and analyzed using X-ray powder diffraction. NOTE: This method makes improvements in sample handling and quality assurance to P&CAM 316, which it replaces.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Indefinite |
| Preservatives: | N/A |
| Required Preps: | 37 mm, 5.0 µm PVC filter |
| Collection Method: | Filter or cyclone and filter, 50-400 L @ 5 mg/m3, variable flow rates |
| Analytical Methodology: | X-ray Powder Diffraction |
| Documentation: | 
7501
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Amorphous Silica, gel | 112926-00-8 |
0.005 |
mg/sample | |
| Amorphous Silica, fumed | 112945-52-5 |
0.005 |
mg/sample | |
| Diatomaceous Earth | 61790-53-2 |
0.005 |
mg/sample | |
| Silicic Acid | H2O3Si |
7699-41-4 |
0.005 |
mg/sample |
* 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.