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Table of Contents < Method 548 Method 549.1 >  Method 548.1 The USEPA method 548.1 is an analytical method in which a sample is extracted using ion-exchange, then derivitized using acidic methylation. The derivitized sample is analyzed using a gas chromatograph equipped with a capillary column to perform theseparation and an MS (Mass Spectrometer) detector to detect the analytes. A GC/FID may be used, but an alternate column must confirm results.  Derivitized Endothall Stand Endothall methyl ester           1.2 mL @ 2000 µg/ml in METH   Catalog#: 5481-MEO  $16.00     Endothall Standard Endothal           1.2 mL @ 2000 µg/ml in METH   Catalog#: 5481-A  $27.00     GC-MS TUNING STD Bis(pentafluorophenyl)phenylphosphine           1.2 mL @ 2500 µg/ml in METH   Catalog#: CLPS-T  $21.00     Intrnal Standard Acenaphthene-d10         1.2 mL @ 2000 µg/ml in METH   Catalog#: 5481-IS  $16.00