title: Dissipation and residue of pymetrozine in rice field ecosystem.
abstract: The dissipation and residue of pymetrozine in rice field ecosystem were studied based on a novel and reliable analytical method for pymetrozine in paddy water, soil, rice straw, brown rice, and rice husk. The pymetrozine residues were extracted with acetonitrile and cleaned up by Carb-NH2 SPE cartridge and determined by high-performance liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS-MS). The dissipation of pymetrozine followed first-order kinetics and its half-lives ranged from 1.7 to 1.8 days in paddy water, 5.1 to 5.7 days in soil, and 2.3 to 2.6 days in rice straw, respectively. At harvest time, the highest final residues of pymetrozine varied in soil among three geographical fields and were below the limit of detection in rice tissues. The recommended dosage was considered to be safe for human beings and animals, and the results were helpful in setting maximum residue limit for pymetrozine in rice.
authors: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
authors: Yanfeng
authors: Y
authors: Zhang
authors: Li
authors: L
authors: Zhang
authors: Peng
authors: P
authors: Xu
authors: Jianzhong
authors: J
authors: Li
authors: Huili
authors: H
authors: Wang
mesh_terms: D000383:Agriculture; D002853:Chromatography, Liquid; D017753:Ecosystem; D004784:Environmental Monitoring; D006207:Half-Life; D007306:Insecticides / Q000032:analysis*; D007700:Kinetics; D013058:Mass Spectrometry; D012275:Oryza / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil; D014227:Triazines / Q000032:analysis*
chemical_list: D007306:Insecticides; D010573:Pesticide Residues; D012987:Soil; D014227:Triazines; C480311:pymetrozine
references: Chemosphere. 2007 Aug;69(1):63-8
references: 17568651
references: J Hazard Mater. 2009 May 30;164(2-3):497-501
references: 18801616
references: J Hazard Mater. 2007 Mar 22;141(3):700-6
references: 16949742
references: Bull Environ Contam Toxicol. 2011 Dec;87(6):649-52
references: 21922281
references: J Chromatogr A. 2010 Apr 16;1217(16):2548-60
references: 20144460
references: Chemosphere. 2006 Oct;65(4):639-43
references: 16529792
references: J Chromatogr A. 2013 Apr 19;1286:1-8
references: 23489497
references: Chemosphere. 2011 Feb;82(6):901-4
references: 21074245
references: J Chromatogr A. 2011 Jul 15;1218(28):4366-77
references: 21632058
references: Ann Chim. 2007 May-Jun;97(5-6):295-301
references: 17696008