National Water Quality Laboratory

Friday October 19, 2018

USGS Open-File Report 02-462

Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory — A Method Supplement for the Determination of Fipronil and Degradates in Water by Gas Chromatography/Mass Spectrometry

James E. Madsen, Mark W. Sandstrom, and Steven D. Zaugg


A method for the isolation and determination of fipronil and four of irs degradates has been developed. This method adapts an analytical method created by the U.S. Geological Survey National Water Quality Laboratory in 1995 for the determination of a broad range of high-use pesticides typically found in filtered natural-water samples. In 2000, fipronil and four of its degradates were extracted, analyzed, and validated using this method. The recoveries for these five compounds in reagent-water samples fortified at 1 microgram per liter (µ/L) averaged 98 percent. Initial method detection limits averaged 0.0029 µg/L. The performance of these five new compounds is consistent with the performance of the compounds in the initial method, making it possible to include them in addition to the other 41 pesticides and pesticide degradates in the original method.

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