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ANALYTICAL METHOD DEVELOPMENT FOR ALACHLOR ESA AND OTHER ACETANILIDE HERBICIDE DEGRADATION PRODUCTS
Citation:
Shoemaker, J A. ANALYTICAL METHOD DEVELOPMENT FOR ALACHLOR ESA AND OTHER ACETANILIDE HERBICIDE DEGRADATION PRODUCTS. Presented at 49th ASMS Conference on Mass Spectrometry and Allied Topics, Chicago, IL, May 27-31, 2001.
Impact/Purpose:
Develop an analytical method for the analysis of alachlor ESA and other acetanilide pesticide degradation products. The draft method, suitable for use in assessing occurrence of the pesticide degradation products as part of the Unregulated Contaminant Monitoring Rule (UCMR), will be delivered to OGWDW by February 2004. The final peer-reviewed method was delivered in September 2004.
Description:
In 1998, USEPA published a Drinking Water Contaminant Candidate List (CCL) of 50 chemicals and 10 microorganisms. "Alachlor ESA and other acetanilide herbicide degradation products" is listed on the the 1998 CCL. Acetanilide degradation products are generally more water soluble and mobile, thus there is greater potential for these degradates to be found in groundwater and surface water. Ethanessulfonic acid (ESA) and oxanilic acid (OA) degradates of the parent herbicides have been reported in US Midwestern surface and ground waters in concentrations as high as 20 micrograms/L. Before a regulatory determination can be made concerning these chemicals, EPA must assess the extent of their occurrence in public water systems. Thus, a reliable EPA occurrence method is needed.