title: Residue analysis of kresoxim-methyl and boscalid in fruits, vegetables and soil using liquid-liquid extraction and gas chromatography-mass spectrometry.
abstract: A GC-MS procedure for simultaneously determining and validating kresoxim-methyl and boscalid has been developed in fruit, vegetable and soil matrices. The method was based on one-step liquid-liquid extraction with acetone and dichloromethane solvents. Estimated limits of detection (LODs) for kresoxim-methyl and boscalid were 0.006 and 0.015 mg/kg, and limits of quantification (LOQs) were 0.02 and 0.05 mg/kg, respectively. The intra- and inter- precision were achieved with RSD better than 13.8 and 14.5%, and recoveries were in the range of 77.1-98.7% for kresoxim-methyl and 72.8-105.1% for boscalid. The expanded uncertainties calculated at 0.1 mg/kg were below 18%. Concentration levels for residues of the two fungicides in melon samples from field trials collected 7 days after the last application were clearly below the established MRL values.
authors: Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
authors: Xingang
authors: X
authors: Liu
authors: Fengshou
authors: F
authors: Dong
authors: Dongmei
authors: D
authors: Qin
authors: Yongquan
authors: Y
authors: Zheng
mesh_terms: D001713:Biphenyl Compounds / Q000032:analysis / Q000737:chemistry; D005591:Chemical Fractionation / Q000379:methods*; D005638:Fruit / Q000737:chemistry*; D005659:Fungicides, Industrial / Q000032:analysis / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D008689:Methacrylates / Q000032:analysis / Q000737:chemistry; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D010648:Phenylacetates / Q000032:analysis* / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry; D000073739:Strobilurins; D014675:Vegetables / Q000737:chemistry*
chemical_list: D001713:Biphenyl Compounds; D005659:Fungicides, Industrial; D008689:Methacrylates; D010648:Phenylacetates; D012987:Soil; D012989:Soil Pollutants; D000073739:Strobilurins; C469328:kresoxim-methyl; D009536:Niacinamide; C550088:2-chloro-N-(4-chlorobiphenyl-2-yl)nicotinamide