Bioavailability assessment of thiacloprid in soil as affected by biochar

文献类型： 外文期刊

第一作者： Zhu, Yulong

作者： Zhu, Yulong;Liu, Xingang;Wu, Xiaohu;Dong, Fengshou;Xu, Jun;Zheng, Yongquan

作者机构：

关键词： Bioavailability;Biochar;Tenax method;Earthworm;Thiacloprid

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Biochars can significantly sorb pesticides, and reduce their bioavailability in agricultural soils. In this study, the effects of a type of biochar (BC500) on the sorption, degradation, bioaccumulation and bioavailability of thiacloprid, which is a commonly used insecticide, were investigated. The thiacloprid sorption constant (K-f values) increased by 14 times after 2% BC500 application, and the degradation of the insecticide decreased with increasing amounts of the biochars in the soil. Coupled with the exhaustive extraction and single-point Tenax method, the bioavailability of thiacloprid was predicted in the presence of the biochar. In soils amended with BC500, the thiacloprid concentrations accumulated in Tenax correlated well with those observed in earthworms (R-2 = 0.887), whereas the concentrations extracted by exhaustive method followed a less significant relationship with those in earthworms (R-2 = 0.624). The results of Tenax extractions and earthworm bioassays indicate that biochar reduces the bioavailability of thiacloprid in soil, but the delayed degradation and increased earthworm accumulation in aged biochar-amended soil imply that the environmental risks of biochar application to earthworms remain. (C) 2016 Elsevier Ltd. All rights reserved.

分类号： X5

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