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View Actual EPA Method 615 (PDF File)
EPA Method 615:The Determination of Chlorinated Herbicides in Municipal and Industrial Wastewater
Summary:A measured volume of sample, approximately 1 L, is acidified. The acid herbicides and their esters and salts are extracted with ethyl ether using a separatory funnel. The derivatives are hydrolyzed with potassium hydroxide and extraneous organic material is removed by a solvent wash. After acidification, the acids are extracted and converted to their methyl esters using diazomethane as the derivatizing agent. Excess reagent is removed, and the esters are determined by electron capture (EC) gas chromatography.
Scope:This method covers the determination of certain chlorinated herbicides.