A Preliminary Report on the Use of Silver Metal Membrane Filters in Sampling for Coal Tar Pitch Volatiles

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Abstract
Background information concerning reasons for the initiation of this study, the tentative threshold limit of 0.2 mg per cu. m of air (ACGIH), and previous attempts at sampling with glass fiber filters are discussed. Problems encountered in obtaining consistent results with glass fiber filters and the benzene extraction analysis technique led to a search for a better technique. Comparison of glass fiber filters, cellulose acetate membranes, cellulose filters, and cellulose thimbles with the silver membranes were made. This comparison included weight stability with humidity changes and benzene extraction and airflow determinations. The results of actual sampling are listed, and other possible uses of the metal membrane in industrial hygiene are discussed.

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