Skip to main content
U.S. flag

An official website of the United States government

Analysis of chlorothalonil and three degradates in sediment and soil

January 1, 2008

A method has been developed for the simultaneous extraction of chlorothalonil and three of its degradates (4-hydroxy-2,5,6-trichloroisophthalonitrile, 1-carbamoyl-3-cyano-4-hydroxy-2,5,6-trichlorobenzene, and 1,3-dicarbamoyl-2,4,5,6-tetrachlorobenzene) from soils and sediments; the compounds were extracted using sonication with acetone and isolation of the parent compound and matrix interferences from the degradates by solid phase extraction (SPE). The chlorothalonil fraction underwent further coextracted matrix interference removal with Florisil. The degradates were derivatized with N,O-bis(trimethylsilyl) trifluoroacetamide (BSTFA) and chlorotrimethylsilane (TMCS). All compounds were analyzed by gas chromatography–mass spectrometry (GC-MS). Recoveries on a spiked (20 and 200 µg kg−1) sediment ranged from 80% to 91% with calculated limits of detection of 1−5 µg kg−1 dry weight sediment. An additional 20 sediment samples were collected in watersheds from the Southeastern United States where chlorothalonil is used widely on peanuts and other crops. None of the target compounds were detected. Laboratory fortified recoveries of chlorothalonil and its degradates in these environmental sediment samples ranged from 75% to 89%.

Publication Year 2008
Title Analysis of chlorothalonil and three degradates in sediment and soil
DOI 10.1021/jf703695s
Authors M.L. Hladik, K.M. Kuivila
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Agricultural and Food Chemistry
Index ID 70032016
Record Source USGS Publications Warehouse
USGS Organization California Water Science Center; Toxic Substances Hydrology Program