Method 537 is currently used only for drinking water samples. Although nationally approved methods for measuring PFCs in non-drinking water samples are not yet available, the following consensus organization methods are provided by the American Society for Testing and Materials (ASTM):

• ASTM D7968: Standard Test Method for Determination of Perfluorinated Compounds in Soil by Liquid Chromatography Tandem Mass Spectrometry (LC/MS/MS) (PDF)(17 pp, 175 K) Exit [ASTM may charge a fee for this document.]

• ASTM D7979: Standard Test Method for Determination of Perfluorinated Compounds in Water, Sludge, Influent, Effluent and Wastewater by Liquid Chromatography Tandem Mass Spectrometry (LC/MS/MS) (PDF) (18 pp, 181 K) Exit [ASTM may charge a fee for this document.]