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Table of Contents < Method 552 Method 552.2 >  Method 552.1 The USEPA method 552.1 utilizes a liquid-solid extraction to determine haloacetic acids, disinfection by-products an dthe chlorinated herbicide, Dalapon. The sample is extracted with a miniature anion exchange column and the analytes are methylateddirectly in the eluent using acidic acidic methanol instead of diazomethane. A gas chromatograph equipped with a capillary column is used to perform the separation of methyl-haloacetates and anisoles. To detect the GC eluant, an ECD (Electron capture)detector is used.  1,2,3-Trichloropropane 1,2,3-Trichloropropane           1.2 mL @ 1000 µg/ml in METH-P&T   Catalog#: S-3665       2,3-Dibromopropionic Acid 2,3-Dibromopropionic acid           1.2 mL @ 1000 µg/ml in METH-P&T   Catalog#: S-3895       FREE ACIDS Bromoacetic acid Bromochloroacetic acid Chloroacetic acid Dalapon Dibromoacetic acid Dichloroacetic acid Trichloroacetic acid           1.2 mL @ 200 µg/ml in MTBE   Catalog#: 5521-A           1.2 ML X 4 PACK   Catalog#: 5521-A-4       METH 552.1 METHYL ESTERS Compound µg/mL Dalapon 200 Methyl-Bromoacetate 200 Methyl-bromochloroacetate 200 Methyl-Chloroacetate 300 Compound µg/mL Methyl-Dibromoacetate 100 Methyl-Dichloroacetate 300 Methyl-Trichloroacetate 100           1.2 mL @ 100 µg/ml in MTBE   Catalog#: 5521-MEO           1.2 mL @ 200 µg/ml in MTBE   Catalog#: 5521-MEO           1.2 mL @ 300 µg/ml in MTBE   Catalog#: 5521-MEO       Methyl-2-Bromopropionate Methyl-2-bromopropionate         1.2 mL @ 1000 µg/ml in MTBE   Catalog#: S-2598