Evaluation of desulfuration methods for pyrethroid, organophosphate, and organochlorine pesticides in sediment with high sulfur content.
This study investigated different cleanup procedures to eliminate sulfur interference from sediments from a reclaimed mining site in Sparta, Illinois. Sonication extraction with activated copper powder was the most effective method to eliminate elemental sulfur. Extracts were then cleaned with a Florisil column before pyrethroid, organophosphate, and organochlorine pesticides were determined using gas chromatography with electron-capture detection. The method detection limits ranged from 0.03 to 0.68 microg/kg dry sediment. Recoveries for spiked samples were from 82.2% to 132.7% with relative standard deviations < 15%. Fifty-four sediment samples collected from 15 lakes and 1 stream in the proposed Illinois National Guard Armory were analyzed using the desulfuration procedure. Of the 26 target pesticides analyzed in sediment, 20 were detected above the detection threshold of 1 microg/kg. DDT was detected most frequently (found at 50% of the sampling sites), whereas permethrin was found at the greatest concentration.
You
J
J
Fisheries and Illinois Aquaculture Center and Department of Zoology, Southern Illinois University-Carbondale, Carbondale, Illinois 62901, USA.
Lydy
M J
MJ
D002849:Chromatography, Gas; D019015:Geologic Sediments / Q000737:chemistry*; D008906:Mining; D010573:Pesticide Residues / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D012680:Sensitivity and Specificity; D013048:Specimen Handling; D013455:Sulfur / Q000737:chemistry* / Q000302:isolation & purification*
D010573:Pesticide Residues; D010575:Pesticides; D013455:Sulfur