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Table of Contents < Method 548.1 Method 550/550.1 >  Method 549.1 The USEPA method 549.1 is an analytical method in which a sample is extracted utilizing solid phase extraction, then analyzed using an HPLC system to perform the separation and a UV detect the analytes.  COMBINATION BLEND Diquat dibromide monohydrate Paraquat Dichloride Tetrahydrate           1.2 mL @ 1000 µg/ml in WATER   Catalog#: 5491-A