Abstract

Polychlorinated biphenyls (PCBs) have been found in some pipeline condensates by the natural gas pipeline companies. Polyurethane foam Florisil and Amberlite XAD-2 have been used by US EPA to determine PCBs in air and stack gases. However, it was not known whether natural gas, which contains several impurities including hexane, the solvent normally used to extract the media prior to analysis, would elute the trapped PCBs from the collection media. To resolve this question, retention efficiency studies were conducted for each trapping medium using natural gas in place of air.

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