Analysis of chlorothalonil and three degradates in sediment and soil

Journal of Agricultural and Food Chemistry
By:  and 



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%.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Analysis of chlorothalonil and three degradates in sediment and soil
Series title Journal of Agricultural and Food Chemistry
DOI 10.1021/jf703695s
Volume 56
Issue 7
Year Published 2008
Language English
Publisher ACS
Contributing office(s) California Water Science Center, Toxic Substances Hydrology Program
Description 5 p.
First page 2310
Last page 2314