Effects of biochars on the fate of acetochlor in soil and on its uptake in maize seedling

文献类型： 外文期刊

第一作者： Liu, Xingang

作者： Liu, Xingang;Wu, Xiaohu;Dong, Fengshou;Xu, Jun;Pan, Xinglu;Zheng, Yongquan;Liu, Xingang

作者机构：

关键词： Acetochlor; Biochar; Bioavailability; Bioaccumulation; Maize seedling

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

ISSN： 0269-7491

年卷期： 2018 年 241 卷

页码：

收录情况： SCI

摘要： Biochar (BC) can alter the fate and bioavailability of pesticides in soil. In this study, the effects of three types of BCs (made of crofton weed, wood chips and rice hull) on the sorption of acetochlor, a common herbicide, were investigated. The acetochlor sorption constants (K-f/value) were 309.96 mu g(1-n)L(n/)kg (biochars made of ricehull, BCR), 3.54 mu g(1-n)L(n/)kg (biochars made of crofton weed, BCH) and 2.27 mu g(1-n)L(n/)kg (biochars made of wood chips, BCW). The persistence of acetochlor was 8 times greater when 1% BCR was added to the soil. Moreover, the half-life of acetochlor increased with increasing amounts of BC in the soil. The soil was amended with BCH (made of crofton weed) for two different aging period (10 d and 20 d) to evaluate the effects of aged BC on acetochlor accumulation in maize seedlings (Zea mays L). Amendment with 10 d-aged BCH in soil decreased the bioaccumulation of acetochlor. However, the concentrations and bioconcentration factors in maize cultivated in 20 d-aged BCH-amended soils were significantly higher than those in soil with no BCH amendments and with 10 d-aged BCH amendments. These results imply that BC aged in soil for a long period can increase the bioaccumulation of acetochlor in plants and the influences of BC on environmental risks of pesticides must be further clarified. (C) 2018 Elsevier Ltd. All rights reserved.

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