title: Identification of multi-insecticide residues using GC-NPD and the degradation kinetics of chlorpyrifos in sweet corn and soils.
abstract: Because more than one insecticide is applied to crops to protect plants from pests, an analytical multi-residue determination method was developed using gas chromatography with a nitrogen phosphorus detector (GC-NPD). The retention time for 12 insecticides was 3.7-27.7min. Under the selected conditions, the limits of detection (LOD) and quantification (LOQ) were below the maximum residue limits (MRLs) and in the range of 0.00315-0.05μgmL(-1) and 0.01-0.165μgmL(-1), respectively. Using GC-NPD, we investigated the dissipation dynamics and final residual levels of chlorpyrifos in sweet corn and soil and determined that the half-lives was 4-7days, that is, that chlorpyrifos is safe to use on sweet corn with a pre-harvest interval of 16-22days before harvest. These results provide new insights into chlorpyrifos degradation in plants and its environmental behavior.
authors.affiliation: Laboratory of Insect Toxicology and Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, PR China.
authors.forename: Peidan
authors.initials: P
authors.lastname: Wang
authors.affiliation: Laboratory of Insect Toxicology and Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, PR China.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Rashid
authors.affiliation: Laboratory of Insect Toxicology and Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.affiliation: Laboratory of Insect Toxicology and Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, PR China. Electronic address: humy@scau.edu.cn.
authors.forename: Meiying
authors.initials: M
authors.lastname: Hu
authors.affiliation: Laboratory of Insect Toxicology and Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, PR China. Electronic address: guohuazhong@scau.edu.cn.
authors.forename: Guohua
authors.initials: G
authors.lastname: Zhong
mesh_terms: D004390:Chlorpyrifos / Q000032:analysis / Q000493:pharmacokinetics; D002849:Chromatography, Gas / Q000379:methods; D018556:Crops, Agricultural / Q000737:chemistry; D007306:Insecticides / Q000032:analysis / Q000493:pharmacokinetics; D010573:Pesticide Residues / Q000032:analysis / Q000493:pharmacokinetics; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000493:pharmacokinetics; D003313:Zea mays / Q000737:chemistry
chemical_list: D004390:Chlorpyrifos; D007306:Insecticides; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants
keywords: Chlorpyrifos; GC-NPD; Pesticide residue; Soil; Sweet corn