title: Dissipation and residue of MCPA (4-chloro-2-ethylphenoxyacetate) in wheat and soil.
abstract: A rapid and simple HPLC method has been developed for the quantitation of 4-chloro-2-methylphenoxyacetic acid (MCPA) in both wheat and soil samples. Samples were extracted in acidic media and cleaned up by solid-phase extraction with C(18) cartridges before HPLC-DAD detection. The limits of detection and quantification of MCPA were 0.02 ng and 0.01 mg/kg for both wheat and soil. The mean recoveries ranged from 87.1% to 98.2%, and the RSDs ranged from 0.604% to 3.44% for the three spiked levels (0.01, 0.1, 0.5 mg/kg). The proposed method was successfully applied to the analysis of MCPA residues in wheat and soil samples from an experimental field. The dissipation half-lives in soil were calculated to be 3.22 days (Beijing) and 3.10 days (Tianjin), respectively. Direct confirmation of the analytes in real samples was achieved by gas chromatography-mass spectrometry. The results indicated that at harvest time, the residues of MCPA in wheat were well below the maximum residue levels and were safe to apply in wheat.
authors.affiliation: School of Chemical and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China. jyhu@ustb.edu.cn
authors.forename: Jiye
authors.initials: J
authors.lastname: Hu
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.forename: Shaoyin
authors.initials: S
authors.lastname: Yin
authors.forename: Di
authors.initials: D
authors.lastname: Cao
mesh_terms: D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D004784:Environmental Monitoring; D006207:Half-Life; D006540:Herbicides / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D052616:Solid Phase Extraction; D014908:Triticum / Q000737:chemistry*
chemical_list: D006540:Herbicides; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D008456:2-Methyl-4-chlorophenoxyacetic Acid