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Analytical Techniques to Measure Sethoxydim and Breakdown Products

Published online by Cambridge University Press:  12 June 2017

Antony R. Shoaf  and
William C. Carlson
Antony R. Shoaf
Affiliation:
Div. Toxicol., Dep. Pharmacol. and Interdisciplinary Toxicol., Univ. Arkansas for Medical Sciences, Little Rock, AR 72205
William C. Carlson
Affiliation:
South. Forestry Res. Dep., Weyerhaeuser Co., Hot Springs, AR 71902
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Abstract

A method was developed for the quantitative determination of trace levels of the widely used herbicide sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} and its metabolites in an aqueous solution using reversed-phase high-performance liquid chromatography (HPLC). Optimum extraction of sethoxydim was with dichloromethane and was only 15% efficient at pH 3. The limit of detection by HPLC for sethoxydim was 5 ng on column and <5 ppb in soil. At least five different compounds were detected in the commercial formulation, in EPA reference standards, and in commercial sethoxydim standards. Sethoxydim undergoes a rapid decomposition in the presence of water to form more polar products, which accounts for the low extraction efficiency. Decomposition was greatest under alkaline conditions. Acid pH and soil inhibited decomposition and gave greater recoveries of parent compound. At least one breakdown product cochromatographed with a known sulfone derivative. The procedures are directly applicable to soils, environmental waters, and plant and animal tissues.

Keywords

Liquid chromatographyrapid alkaline decomposition
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 5 , September 1986 , pp. 745 - 751
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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