title: Persistence and dissipation of chlorpyrifos in Brassica chinensis, lettuce, celery, asparagus lettuce, eggplant, and pepper in a greenhouse.
abstract: The residue behavior of chlorpyrifos, which is one of the extensively used insecticides all around the world, in six vegetable crops was assessed under greenhouse conditions. Each of the vegetables was subjected to a foliar treatment with chlorpyrifos. Two analytical methods were developed using gas chromatography equipped with a micro-ECD detector (LOQ = 0.05 mg kg(-1)) and liquid chromatography with a tandem mass spectrometry (LOQ = 0.01 mg kg(-1)). The initial foliar deposited concentration of chlorpyrifos (mg kg(-1)) on the six vegetables followed the increasing order of brassica chinensis<lettuce<celery<asparagus lettuce<eggplant <pepper. The initial deposition of chlorpyrifos showed differences among the six selected vegetable plants, ranging from 16.5±0.9 mg kg(-1) (brassica chinensis) to 74.0±5.9 mg kg(-1) (pepper plant). At pre-harvest interval 21 days, the chlorpyrifos residues in edible parts of the crops were <0.01 (eggplant fruit), <0.01 (pepper fruit), 0.56 (lettuce), 0.97 (brassica chinensis), 1.47 (asparagus lettuce), and 3.50 mg kg(-1) (celery), respectively. The half-lives of chlorpyrifos were found to be 7.79 (soil), 2.64 (pepper plants), 3.90 (asparagus lettuce), 3.92 (lettuce), 5.81 (brassica chinensis), 3.00 (eggplant plant), and 5.45 days (celery), respectively. The dissipation of chlorpyrifos in soil and the six selected plants was different, indicating that the persistence of chlorpyrifos residues strongly depends upon leaf characteristics of the selected vegetables.
authors: Pesticide Biology and Ecology Research Center, Nanjing, Jiangsu, China; Key Laboratory of Food Safety Monitoring and Management of Ministry of Agriculture, Nanjing, Jiangsu, China.
authors: Meng-Xiao
authors: MX
authors: Lu
authors: Department of Entomology, Michigan State University, East Lansing, Michigan, United States of America.
authors: Wayne W
authors: WW
authors: Jiang
authors: Pesticide Biology and Ecology Research Center, Nanjing, Jiangsu, China.
authors: Jia-Lei
authors: JL
authors: Wang
authors: Institute for the Control of Agrochemicals, Ministry of Agriculture, Beijing, China.
authors: Qiu
authors: Q
authors: Jian
authors: Key Laboratory of Food Safety Monitoring and Management of Ministry of Agriculture, Nanjing, Jiangsu, China.
authors: Yan
authors: Y
authors: Shen
authors: Pesticide Biology and Ecology Research Center, Nanjing, Jiangsu, China; Key Laboratory of Food Safety Monitoring and Management of Ministry of Agriculture, Nanjing, Jiangsu, China.
authors: Xian-Jin
authors: XJ
authors: Liu
authors: Pesticide Biology and Ecology Research Center, Nanjing, Jiangsu, China; Key Laboratory of Food Safety Monitoring and Management of Ministry of Agriculture, Nanjing, Jiangsu, China.
authors: Xiang-Yang
authors: XY
authors: Yu
mesh_terms: D000077102:Apium / Q000378:metabolism; D001937:Brassica / Q000378:metabolism; D004390:Chlorpyrifos / Q000737:chemistry / Q000378:metabolism*; D018556:Crops, Agricultural / Q000378:metabolism*; D004780:Environment, Controlled; D059022:Food Safety; D018545:Lactuca / Q000378:metabolism; D010573:Pesticide Residues / Q000737:chemistry / Q000378:metabolism*; D031701:Piper / Q000737:chemistry / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D032323:Solanum melongena / Q000378:metabolism
chemical_list: D010573:Pesticide Residues; D012987:Soil; D004390:Chlorpyrifos