Dissipation, occurrence and risk assessment of a phenyturea herbicide tebuthiuron in sugarcane and aquatic ecosystems in South China

文献类型： 外文期刊

第一作者： Qian, Yuan

作者： Qian, Yuan;Matsumoto, Haruna;Liu, Xiaoyu;Li, Shuying;Liu, Yanan;Zhu, Guonian;Wang, Mengcen;Liang, Xiao

作者机构：

关键词： Tebuthiuron;Sugarcane;Dissipation;Occurrence;UPLC-QqQ-MS/MS;Dietary and ecological risks

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： In this study, a modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) method coupled with UPLC-QqQ-MS/MS analysis was developed to detect tebuthiuron in sugarcane fields and the surrounding aquatic ecosystems. Methodological validation showed the method developed was of favorable sensitivity, reproducibility and accuracy. For assessment of its dietary and ecological risks, dissipation and occurrence of tebuthiuron in situ were further investigated through a supervised field trial and an aquatic environment monitoring carried out in six dominant sugarcane production regions in South China. After application at the range of recommended dose, tebuthiuron dominantly distributed in soil, and then dissipated in accordance with the first-order rate model with the half-lives of 12.2-21.5 d. At pre-harvest intervals (PHI), occurrence of tebuthiuron was found to be 0.718-1.366 mg/kg and 0.016-0.034 mg/kg, in sugarcane and soil, respectively. The supervised trials median residue (STMR) of tebuthiuron in sugarcane was thus 0.024 mg/kg and the dietary Risk Quotient (RQ(d)) was accordingly calculated as 2.34 x 10(-4), indicating safety on long-term consumption of sugarcane with tebuthiuron residues. Yet high risks of tebuthiuron towards soil ecosystems was noticed as it possessed maximum ecological Risk Quotient (RQ(e)) at 1.97 to earthworms. In sugarcane field-surrounding aquatic environment, distribution of tebuthiuron was found to range from 0.007 mg/L to 0.022 mg/L, leading to high risk towards the aquatic ecosystem due to the maximum RQe at 440 to algae, irrespective of its low risks to invertebrate and fish. Taken together, our approach serve as an effective tool for monitoring residual tebuthiuron environmentally and also advance in-depth understanding of dietary and ecological risks posed by the phenylurea herbicide. (C) 2017 Elsevier Ltd. All rights reserved.

分类号： X5

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