title: Dissipation of pyraclostrobin and its metabolite BF-500-3 in maize under field conditions.
abstract: The dissipation and residue of pyraclostrobin and its metabolite BF-500-3 in maize under field conditions were investigated. A sensitive, simple and fast method for simultaneous determination of pyraclostrobin and BF-500-3 in maize matrix was established by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The average recoveries of pyraclostrobin and BF-500-3 were found in the range of 83.6-104.9% with relative standard deviations (RSDs) of 2.3-10.0%. The results showed that pyraclostrobin dissipated quickly in maize plant with half-lives of 1.6-1.7 days. Its metabolite BF-500-3 showed a tendency of rapid increasing initially and decreasing afterwards. At harvest time, the terminal residues of pyraclostrobin were below the maximum residue limit (MRL) set by USA and Canada in maize grain when measured 7 days after the final application, which suggested that the use of this fungicide was safe for humans. The results could provide guidance to safe and reasonable use of pyraclostrobin in agriculture.
authors.affiliation: College of Science, China Agricultural University, Beijing 100193, PR China.
authors.forename: Xiangwei
authors.initials: X
authors.lastname: You
authors.forename: Congyun
authors.initials: C
authors.lastname: Liu
authors.forename: Fengmao
authors.initials: F
authors.lastname: Liu
authors.forename: Yanping
authors.initials: Y
authors.lastname: Liu
authors.forename: Jiannan
authors.initials: J
authors.lastname: Dong
mesh_terms: D000383:Agriculture; D002170:Canada; D002219:Carbamates / Q000032:analysis / Q000378:metabolism*; D002681:China; D002851:Chromatography, High Pressure Liquid; D004784:Environmental Monitoring; D005659:Fungicides, Industrial / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D006207:Half-Life; D010573:Pesticide Residues / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D011720:Pyrazoles / Q000032:analysis / Q000378:metabolism*; D000073739:Strobilurins; D053719:Tandem Mass Spectrometry; D014481:United States; D003313:Zea mays / Q000737:chemistry / Q000378:metabolism*
chemical_list: D002219:Carbamates; D005659:Fungicides, Industrial; D010573:Pesticide Residues; D011720:Pyrazoles; D000073739:Strobilurins; C513428:pyrachlostrobin