title: Multi-residue method for the analysis of 85 current-use and legacy pesticides in bed and suspended sediments.
abstract: A multi-residue method was developed for the simultaneous determination of 85 current-use and legacy organochlorine pesticides in a single sediment sample. After microwave-assisted extraction, clean-up of samples was optimized using gel permeation chromatography and either stacked carbon and alumina solid-phase extraction cartridges or a deactivated Florisil column. Analytes were determined by gas chromatography with ion-trap mass spectrometry and electron capture detection. Method detection limits ranged from 0.6 to 8.9 microg/kg dry weight. Bed and suspended sediments from a variety of locations were analyzed to validate the method and 29 pesticides, including at least 1 from every class, were detected.
authors.affiliation: U.S. Geological Survey, 6000 J. Street, Placer Hall, Sacramento, CA 95819, USA. ksmall@usgs.gov
authors.forename: Kelly L
authors.initials: KL
authors.lastname: Smalling
authors.forename: Kathryn M
authors.initials: KM
authors.lastname: Kuivila
mesh_terms: D002850:Chromatography, Gel / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis; D008872:Microwaves; D010573:Pesticide Residues / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D052616:Solid Phase Extraction / Q000379:methods*
chemical_list: D004785:Environmental Pollutants; D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D010575:Pesticides