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Resource Center

We have included some reference materials for your use. Please click on the descriptions below to review the specific subject matter. If you have any questions, please contact us or use our Live Chat and we can answer all your questions. If there are other topics that we can help you with, please let us know.We’re always here to assist with all your industrial hygiene questions and needs!

Coal Tar Pitch Volatiles

Benzene soluble particulate matter should not be attributed to coal tar pitch volatiles unless polynuclear aromatic hydrocarbons (PNAHs) are present. OSHA Method 58 specifies the collection of particulates using a glass fiber filter (GFF) and the gravimetric determination of the benzene-soluble fraction (BSF). If the BSF exceeds 0.2 mg/m3, then the sample should be analyzed by high performance liquid chromatography (HPLC) to determine the presence of selected PNAHs. The detection limit of the gravimetric procedure is listed as 6 ug per sample; the detection limit of the HPLC procedure is significantly lower. In many cases, NIOSH Method 5506 is preferred, as this method specifies collection using a filter as well as an XAD tube and collects both particulate and vapor phase PNAHs; analyses of both is performed by HPLC. The NIOSH method eliminates possible interferences and inaccuracies produced by the tedious extraction specified in the OSHA method. You can request two different PNAH HPLC scans: 5 compounds or 17 compounds.

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