Dissipation and Residues of Dichlorprop-P and Bentazone in Wheat-Field Ecosystem

Xiaoxiao Feng, Jianlei Yu, Lixiang Pan, Guochun Song and Hongyan Zhang
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Xiaoxiao Feng: College of Science, China Agricultural University, Beijing 100193, China
Jianlei Yu: Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Lixiang Pan: College of Science, China Agricultural University, Beijing 100193, China
Guochun Song: Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Hongyan Zhang: College of Science, China Agricultural University, Beijing 100193, China

IJERPH, 2016, vol. 13, issue 6, 1-14

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 ?g/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).

Keywords: dichlorprop-P; bentazone; dissipation; residue; wheat (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2016
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