Analysis of Pesticide Residues by Chemical Derivatization. II. N-Methylcarbamates in Natural Water and Soils
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- John A Coburn
- Water Quality Branch, Canada Centre for Inland Waters, 867 Lakeshore Rd, Burlington, Ontario, Canada L7R 4A6
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- Brian D Ripley
- Water Quality Branch, Canada Centre for Inland Waters, 867 Lakeshore Rd, Burlington, Ontario, Canada L7R 4A6
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- Alfred S Y Chau
- Water Quality Branch, Canada Centre for Inland Waters, 867 Lakeshore Rd, Burlington, Ontario, Canada L7R 4A6
説明
<jats:title>Abstract</jats:title> <jats:p>A method for the quantitative determination of several N-methylcarbamates in natural waters and the applicability of the derivative to soil samples using a previously published extraction procedure are described. After extraction of the carbamates from the substrate, the carbamates are hydrolyzed in a 10% methanol-potassium hydroxide solution to form the phenolic hydrolysis products, which are isolated and derivatized with pentafluorobenzyl (PFB) bromide to produce the PFB ether derivatives. The PFB derivatives are cleaned up and fractionated on a silica gel microcolumn and determined by electron capture gas-liquid chromatography (GLC). Eight organophosphate pesticides and 2 phthalate acid esters that hydrolyze to phenols or phthalic acid were evaluated as potential interferences and were found not to interfere with any of the carbamates tested. Quantitative determinations of 0.1 μg carbofuran and 3-ketocarbofuran and 0.5 μg carbaryl, metmercapturon, and Mobam in a 1 L water sample are possible. Propoxur was not determined at levels <1 μg/L due to the short GLC retention time of the derivative and interferences from the reagents at the lower levels.</jats:p>
収録刊行物
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- Journal of AOAC INTERNATIONAL
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Journal of AOAC INTERNATIONAL 59 (1), 188-196, 1976-01-01
Oxford University Press (OUP)
