This method is for the collection and analysis of carbon black from workplace air. The sample is collected on a pre-weighed 37mm low-ash polyvinyl chloride (PVC) filter. After collection, the filter is gravimetrically screened for carbon blank. If the result is greated than the OSHA PEL (3.5 mg/m3), further processing is needed. The filter is dissolved in tetrahydrofuran (THF) and the residue is redeposited on a THF-rinsed quartz fiber filter. The quartz filter is heated at 150°C, cooled, and then weighed. The filters are then reheated at 600°C and cooled and reweighed. The weight loss after heating at 600°C is reported as carbon black.
NOTE: This is a partially validated method.
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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 |
| Collection Method: | The method recommends a 2 L/min. flow rate and a 480 - 960L sample collection volume. |
| Analytical Methodology: | Gravimetric |
| Documentation: | 
ID-196
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Carbon black | C |
1333-86-4 |
0.1 |
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.