EPA has published a draft procedure (with no EPA method number) for the determination of perfluorinated carboxylic acids, perfluorinated sulfonic acids, methyl and ethyl perfluroro-octanesulfonamides, and (methyl and ethyl sulfonamido)-ethanols in sewage sludge and biosolids. The procedure employs high performance liquid chromatography (HPLC) combined with tandem mass spectrometry (MS/MS).

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