title: Analysis of pyrethroid insecticides in Chironomus dilutus using matrix solid phase dispersion extraction.
abstract: A matrix solid phase dispersion method was developed to detect eight pyrethroid insecticides in the aquatic invertebrate, Chironomus dilutus. A mixture of silica gel, diatomaceous earth and primary/secondary amino solid absorbents were selected as the dispersion matrix, while 7% ethyl ether in hexane was used as the elution solvent. Method detection limits for the target pyrethroids ranged from 0.46 to 4.4 microg kg(-1), and recoveries were 63.5%-124.0%, 43.7%-116.0% and 53.1%-93.1% at spiked levels of 5, 20 and 50 microg kg(-1), respectively. The developed method was used to assess pyrethroid residues in laboratory-exposed and field-collected C. dilutus.
authors.affiliation: Fisheries and Illinois Aquaculture Center & Department of Zoology, Southern Illinois University, Carbondale, IL 62901, USA.
authors.forename: Yuping
authors.initials: Y
authors.lastname: Ding
authors.forename: Jing
authors.initials: J
authors.lastname: You
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Lydy
mesh_terms: D000818:Animals; D002683:Chironomidae / Q000737:chemistry*; D002849:Chromatography, Gas; D007202:Indicators and Reagents; D007306:Insecticides / Q000032:analysis*; D007814:Larva / Q000737:chemistry; D008055:Lipids / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis; D011722:Pyrethrins / Q000032:analysis*; D052616:Solid Phase Extraction; D012997:Solvents
chemical_list: D007202:Indicators and Reagents; D007306:Insecticides; D008055:Lipids; D010573:Pesticide Residues; D011722:Pyrethrins; D012997:Solvents