The Determination of Chlorinated Herbicides in Municipal and Industrial Wastewater
This method covers the determination of certain chlorinated herbicides. This is a gas chromatographic (GC) method applicable to the determination of the compounds listed above in industrial and municipal discharges as provided under 40 CFR 136.1.
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.
–Method 61:The Determination of Chlorinated Herbicides in Municipal and Industrial Wastewater, EPA 1992
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