EPA Method 1650

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EPA Method 1650:
Adsorbable Organic Halides by Adsorption and Coulometric Titration

Summary:
Sample preservation: Residual chlorine that may be present is removed by the addition of sodium thiosulfate. Samples are adjusted to a pH < 2 and maintained at 0 to 4EC until analysis.

Scope:
This method is for determination of adsorbable organic halides (AOX) associated with the Clean Water Act, the Resource Conservation and Recovery Act; the Comprehensive Environmental Response, Compensation, and Liability Act; and other organic halides amenable to combustion and coulometric titration. The method is designed to meet the survey and monitoring requirements of the Environmental Protection Agency (EPA).

Interferences:
Solvents, reagents, glassware, and other sample processing hardware may yield elevated readings from the micro-coulometer. All materials used in the analysis shall be demonstrated to be free from interferences under the conditions of analysis by running method blanks initially and with each sample batch (samples started through the adsorption process in a given eight-hour shift, to a maximum of 20 samples). Specific selection of reagents and purification of solvents may be required.

Revision Number:
Revision C