title: Dissipation and Residues of Dichlorprop-P and Bentazone in Wheat-Field Ecosystem.
abstract: Dichlorprop-P and bentazone have been widely used in the prevention and control of weeds in wheat field ecosystems. There is a concern that pesticide residues and metabolites remain on or in the wheat. Thus, the study of the determination and monitoring of their residues in wheat has important significance. A rapid, simple and reliable QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) method was modified, developed and validated for the determination of dichlorprop-P, bentazone and its metabolites (6-hydroxy-bentazone and 8-hydroxy-bentazone) in wheat (wheat plants, wheat straw and grains of wheat) using high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS). The average recoveries of this method ranged from 72.9% to 108.7%, and the limits of quantification (LOQs) were 2.5-12 μg/kg. The dissipation and final residue of four compounds in three provinces (Shandong, Jiangsu and Heilongjiang) in China were studied. The trial results showed that the half-lives of dichlorprop-P and bentazone were 1.9-2.5 days and 0.5-2.4 days in wheat plants, respectively. The terminal residues in grains of wheat and wheat straw at harvest were all much below the maximum residue limit (MRL) of 0.2 mg/kg for dichlorprop-P and 0.1 mg/kg for bentazone established by the European Union (EU, Regulation No. 396/2005).
authors.affiliation: College of Science, China Agricultural University, Beijing 100193, China. xxf0423@cau.edu.cn.
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Feng
authors.affiliation: Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China. jlyu2010@163.com.
authors.forename: Jianlei
authors.initials: J
authors.lastname: Yu
authors.affiliation: College of Science, China Agricultural University, Beijing 100193, China. panlixiang5545@163.com.
authors.forename: Lixiang
authors.initials: L
authors.lastname: Pan
authors.affiliation: Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China. songguochun2008@163.com.
authors.forename: Guochun
authors.initials: G
authors.lastname: Song
authors.affiliation: College of Science, China Agricultural University, Beijing 100193, China. hongyan@cau.edu.cn.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Zhang
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D001581:Benzothiadiazines / Q000032:analysis* / Q000737:chemistry; D002681:China; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D017753:Ecosystem; D006207:Half-Life; D006540:Herbicides / Q000032:analysis* / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis; D053719:Tandem Mass Spectrometry / Q000379:methods; D014908:Triticum
chemical_list: D001581:Benzothiadiazines; D006540:Herbicides; D012989:Soil Pollutants; D015084:2,4-Dichlorophenoxyacetic Acid; C010571:dichlorprop; C002003:bentazone
keywords: bentazone; dichlorprop-P; dissipation; residue; wheat