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Table of Contents < Method 604 Method 606 >  Method 605 The USEPA method 605 is an analytical method which utilizes a chloroform extraction of municipal or industrial wastewater, concentrated to 5-mL (in acetate buffer) and an HPLC equipped with a Lichrosorb RP-2 column to perform the separation of henzidines.To detect the HPLC eluant, an electrochemical detector is used.  605-X Benzidine 3,3'-Dichlorobenzidine         5.2 mL @ 2000 µg/ml in METH   Catalog#: 605-X5       BENZIDINES MIX Benzidine 3,3'-Dichlorobenzidine           1.2 mL @ 2000 µg/ml in METH   Catalog#: 605-X           1.2ML X4   Catalog#: 605-X-4