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Table of Contents < Method 547 Method 548.1 >  Method 548 The USEPA method 548 is an analytical method in which a 5-mL aliquot of sample is derivitized with PFPH. The drivitized sample is extraction and then analyzed using a gas chromatograph equipped with a capillary column to perform the separation and an ECDto detect the analytes.  ENDOTHALL STOCK STD Endothal           1.2 mL @ 2000 µg/ml in WATER   Catalog#: 548-A       ENDOTHALL-PFPH - STOCK STD Endothal-PFPH           1.2 mL @ 2000 µg/ml in MTBE   Catalog#: 548-APFPH       INT STD Endosulfan I         1.2 mL @ 200 µg/ml in MTBE   Catalog#: 548-IS