EPA Method 1657


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EPA Method 1657:
The Determination of Organo-Phosphorus Pesticides in Municipal and Industrial Wastewater

Summary:
Samples containing water-insoluble compounds: A 1-L sample is extracted with methylene chloride using continuous extraction techniques. Samples containing highly water-soluble compounds such as methamidophos: Salt is added to a 1-L sample and the sample is extracted with an azeotropic mixture of chloroform:acetone using continuous extraction techniques. Non-sludge samples: If the solids content is 1 to 30%, the sample is diluted to 1% solids with reagent water, homogenized ultrasonically, and extracted as an aqueous sample. If the solids content is greater than 30%, the sample is extracted with methylene chloride:acetone using ultrasonic techniques. Municipal sludge samples and other intractable sample types: If the solids content is less than 30%, the sample is diluted to 1% solids and extracted as an aqueous sample. If the solids content is greater than 30%, the sample is extracted with acetonitrile and then methylene chloride using ultrasonic techniques. The extract is back-extracted with 2% (w/v) sodium sulfate in reagent water to remove water-soluble interferences and residual acetonitrile.

Scope:
This method is designed to meet the survey requirements of the Environmental Protection Agency (EPA). It is used to determine the (1) organo-phosphorus pesticides associated with the Clean Water Act, the Resource Conservation and Recovery Act, and the Comprehensive Environmental Response, Compensation and Liability Act; and (2) other compounds amenable to extraction and analysis by automated, wide-bore capillary column gas chromatography (GC) with a flame photometric detector.

Report Number:
821/R-93-010-A

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