This method is for the collection and analysis of airborne respirable quartz and cristobalite, also referred to as slica, from workplace air. The sample is collected on a 10mm nylon cyclone followed by a 37mm PVC filter. After collection the particulates are dissolved in tetrahydrofuran (THF), deposited onto a silver membrane filter, and analyzed by X-ray diffraction (XRD).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in the method. |
| Preservatives: | None specified in the method. |
| Required Preps: | 37mm PVC filter with a 5 micron pore size |
| Collection Method: | The method recommends a 1.7 L/min. flow rate with a 816L sample collection volume. |
| Analytical Methodology: | XRD |
| Documentation: | 
ID-142
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Cristobalite | SiO2 |
14464-46-1 |
30 |
µg |
| Silica, crystalline | SiO2 |
14808-60-7 |
10 |
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.