Polyoxymethylene passive samplers to assess the effectiveness of biochar by reducing the content of freely dissolved fipronil and ethiprole

文献类型： 外文期刊

第一作者： Wang, Pingping

作者： Wang, Pingping;Liu, Xingang;Wu, Xiaohu;Dong, Fengshou;Xu, Jun;Zheng, Yongquan;Li, Shasha;Li, Shasha

作者机构：

关键词： Fipronil; Ethiprole; Biochar; Polyoxymethylene; Freely dissolved concentrations

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2018 年 630 卷

页码：

收录情况： SCI

摘要： An equilibrium passive sampler based on polyoxymethylene (POM) was used to determine the freely dissolved concentrations (C-free) of fipronil and ethiprole. The sorption equilibrium times of fipronil and ethiprole in POM were 14.2 d and 24.0 d, respectively. The POM-water partitioning coefficients (logK(POM-water)) were 2.6 for fipronil and 1.4 for ethiprole. The method was further used to evaluate the sorption behavior of biochars which produced by pyrolysis of Magnolia wood (Magnolia denudata) at 300 degrees C, 500 degrees C and 700 degrees C. The amounts of target compounds adsorbed increased with increasing pyrolysis temperature of the biodiars. Biochars characterized by a low polarity index had better sorption capacity for the target compounds. The additions of biochars to sediment were effective in reducing C-free and the enhancement was found to be more pronounced with high biochar content. C-free in sediment with more organic matter was significantly higher after biochar addition. Increasing the sediment-biochar contact Lime from 7 to 30 cl resulted in an increase in sorption of the compounds. We conclude that Magnolia wood biochar effectively reduces the content of freely dissolved fipronil and ethiprole content in sediment. (C) 2018 Published by Elsevier B.V.

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