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Determination of New Sulfonic Acid Metabolites of Chloroacetanilide Herbicides in Ground Water by Ion Trap MS/MSBy E.M. Thurman—, M.T. Lindsey—, Imma Ferrerî, and E.T. Furlongî—U.S. Geological Survey, Lawrence, Kansas îU.S. Geological Survey, Denver, Colorado AbstractThe analysis of several groundwater samples containing acetochlor, alachlor, and metolachlor by ion trap tandem mass spectrometry (MS/MS) showed the presence of several sulfonated metabolites of these parent herbicides. Previous analysis of the samples by high-performance liquid chromatography/mass spectrometry (HPLC/MS) by using a single quadruple mass spectrometer indicated the presence of acetochlor, alachlor, and metolachlor ethane sulfonic acids (ESAs). Ion trap MS/MS was used to confirm the presence of the acetochlor and alachlor ESAs which have the same exact mass of 314 amu. Acetochlor and alachlor ESAs were differentiated by isolating the 314 amu parent ion by ion trap and the subsequent fragmentation in the trap to the 162 and 121 ions for acetochlor and 176 and 121 ions for alachlor. Although the characteristic 80 amu ion, corresponding to SO3¯ ¯, was detected in scan mode, it did not appear in the trap under isolation conditions, which is a shortcoming of the trap compared to triple quad MS/MS. However, the signature ions of the ESA metabolites were found for two new compounds, which are secondary amides of acetochlor, alachlor, and metolachlor ESAs. The approximate concentrations of the ESA amides were about 10 percent of the level of the primary ESAs and these compounds represent the first identification of secondary metabolites of the ubiquitous ESA metabolites of acetochlor, alachlor, and metolachlor in groundwater samples of the Midwestern United States. Additional information about the Organic Geochemistry Research Laboratory can be found at: http://ks.water.usgs.gov/studies/reslab/Thurman, E.M., Lindsey, M.T. Lindsey, Ferrer, Imma, and Furlong, E.T., 2001, Determination of new sulfonic acid metabolites of chloroacetanilide herbicides in ground water by ion trap MS/MS [abst.], in Abstracts of the Eighth Symposium on the Chemistry and Fate of Modern Pesticides, August 21-24, 2001, Copenhagen, Denmark: International Association of Environmental Analytical Chemistry, p. 72. |
U.S. Department of the Interior |
U.S. Geological Survey
URL: /pubs/abstracts/emt.082101.html
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The USGS has collected hydrologic information in Kansas since 1895 with the first USGS Cooperative
Water Program funding agreement for 6 streamflow gages with the Kansas Water Board. USGS collects streamflow
and gage-height data; reservoir content; water-quality and water-quantity data; suspended-sediment data;
and groundwater levels. Hydrologic studies are conducted on national, regional, statewide, and local levels.
The USGS in Kansas works cooperatively with 31 Federal, State, and local agencies, such as the Kansas Water Office, the U.S.Army Corps of Engineers, and the City of Wichita