Kansas Water Science Center
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Accurate Mass Analysis of Ethanesulfonic Acid Degradates of Acetochlor and Alachlor using High-Performance Liquid Chromatography and Time-of-Flight Mass SpectrometryBy E.M. Thurman, Imma Ferrer, and Rick ParryAbstractDegradates of acetochlor and alachlor (ethanesulfonic acids, ESAs) were analyzed in both standards and in a groundwater sample using high-performance liquid chromatography--time-of-flight mass spectrometry with electrospray ionization. The negative pseudomolecular ion of the secondary amide of acetochlor ESA and alachlor ESA gave average masses of 256.0750ß0.0049 amu and 270.0786ß0.0064 amu respectively. Acetochlor and alachlor ESA gave similar masses of 314.1098ß0.0061 amu and 314.1153ß0.0048 amu; however, they could not be distinguished by accurate mass because they have the same empirical formula. On the other hand, they may be distinguished using positive-ion electrospray because of different fragmentation spectra, which did not occur using negation-ion electrospray. Keywords: Water analysis; environmental analysis; acetochlor; alachlor; pesticides; ethanesulfonic acids, organosulfur compounds Additional information about the Organic Geochemistry Research Laboratory can be found at: http://ks.water.usgs.gov/studies/reslabThurman, E.M., Ferrer, Imma, and Parry, Rick, 2002, Accurate mass analysis of ethanesulfonic acid degradates of acetochlor and alachlor using high-performance liquid chromatography and time-of-flight mass spectrometry; Journal of Chromatography A, v. 957, p. 3-9. |
U.S. Department of the Interior |
U.S. Geological Survey
URL: /pubs/abstracts/emt.jca.v957.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