title: Determination of imazaquin residues in soil by solid-phase extraction and high-performance liquid chromatography.
abstract: A method has been developed for the quantitation of imazaquin residues in soil. The herbicide was extracted from soil with methanol-water (2 + 1, v/v) and cleaned up by strong anion-exchange solid-phase extraction cartridges. Analysis was performed by using high-performance liquid chromatography with ultraviolet detection. Average recoveries through the method ranged from 90.7 to 100.6%, with relative standard deviation equal to or lower than 6.6%. The limit of detection was estimated to be 0.0015 mg/kg, and the minimum quantitation concentration of imazaquin in soil was 0.005 mg/kg. This method was successfully applied to evaluate imazaquin residue levels in soil and its dissipation rates in a soybean field in the Xisanqi District of Beijing, People's Republic of China. The dissipation study showed that the half life of imazaquin in soil was 10.37 +/- 0.0135 days at 3 different application rates.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, People's Republic of China. chenxy04@mails.gucas.ac.cn
authors.forename: Chen
authors.initials: C
authors.lastname: Xuyan
authors.forename: Hu
authors.initials: H
authors.lastname: Jiye
authors.forename: Li
authors.initials: L
authors.lastname: Jianzhong
mesh_terms: D000838:Anions; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002852:Chromatography, Ion Exchange; D002853:Chromatography, Liquid; D007093:Imidazoles / Q000032:analysis*; D008956:Models, Chemical; D010573:Pesticide Residues / Q000032:analysis*; D011804:Quinolines / Q000032:analysis*; D012680:Sensitivity and Specificity; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants; D052616:Solid Phase Extraction / Q000379:methods*; D013025:Glycine max; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
chemical_list: D000838:Anions; D007093:Imidazoles; D010573:Pesticide Residues; D011804:Quinolines; D012987:Soil; D012989:Soil Pollutants; C057728:imazaquin