title: Determination of fungicide kresoxim-methyl residues in cucumber and soil by capillary gas chromatography with nitrogen-phosphorus detection.
abstract: The method of residue analysis of kresoxim-methyl and its dissipation rate in cucumber and soil in a greenhouse were studied. Residues of kresoxim-methyl were extracted from cucumber and soil matrices with acetone, purified by liquid-liquid extraction and Florisil cartridges, and then determined by GC with NP-detector. The limit of detection was estimated to be 9 x 10-12 g, and the minimum determination concentration of kresoxim-methyl in the samples was 0.005 mg kg-1. The average recoveries ranged from 89.4 to 100.2% with a coefficient variation between 2.4 and 8.9%. Dissipation study showed that the half-lives of kresoxim-methyl in cucumber were approximately 6.5 days at both the recommended and double the recommended dosage. Half-lives for both the treatments were approximately 8 days in soil. The present study revealed that the residues in cucumber were below the MRL (0.05 mg kg-1, fixed by EU) after 7 days for both treatments.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
authors.forename: Jian-Zhong
authors.initials: JZ
authors.lastname: Li
authors.forename: Xian
authors.initials: X
authors.lastname: Wu
authors.forename: Ji-Ye
authors.initials: JY
authors.lastname: Hu
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D018553:Cucumis sativus / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D005659:Fungicides, Industrial / Q000032:analysis*; D006207:Half-Life; D008689:Methacrylates / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D010648:Phenylacetates / Q000032:analysis*; D012680:Sensitivity and Specificity; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D000073739:Strobilurins
chemical_list: D005659:Fungicides, Industrial; D008689:Methacrylates; D010573:Pesticide Residues; D010648:Phenylacetates; D012987:Soil; D012989:Soil Pollutants; D000073739:Strobilurins; C469328:kresoxim-methyl