Sorption, degradation and bioavailability of oxyfluorfen in biochar-amended soils

文献类型： 外文期刊

第一作者： Liu, Xingang

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

作者机构：

关键词： Oxyfluorfen; Biochar; Sorption; Degradation; Bioavailability

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： 2019 年 658 卷

页码：

收录情况： SCI

摘要： To investigate the effects of biochar amendment on the environmental fate of oxyfluorfen in soils, we evaluated the sorption, degradation and bioavailability of oxyfluorfen in various amended soils. The results showed that different biochars, i.e., derived from peanuts (BCP), chestnuts (BCC), bamboo (BCB), maize straw (BCM), or rice hull (BCR), exhibited different sorption capacities for oxyfluorfen in following the order: BCR > BCB > BCM > BCC > BCP. The sorption constant (K1 value) of the three soils (loamy clay, sandy loam, and clay loam) ranged from 62 to 116 (mu g/g)/(mg/L)(n) and increased by 2.0- to 3.2-fold after introduction of 2% BCR. Furthermore, oxyfluorfen degraded faster in BCR-amendecl soil than in unamenclecl soil, i.e., degradation increased by 1.0- to 1.4-fold with addition of 2% BCR. Introduction of BCR also decreased the oxyfluorfen uptake by soybean plants by 18-63%, and the capacity of soybeans to absorb oxyfluorfen decreased over time. Amendment with 6 months-aged BCR soil increased the uptake of oxyfluorfen by soybean plants by 2.3-fold compared with freshly prepared BCR soil. After the aging process, the observed increase in oxyfluorfen bioavailability was attributed to the reduced adsorption capacity of aged biochar. Nevertheless, BCR was effective for sequestrating oxyfluorfen as demonstrated by the fact that the adsorption capacity of biochar-amended soil after six months of aging was still 1.5- to 2.5-fold greater compared with that of unamended soil. These results demonstrate that amendment with BCR can be an effective method to modify soil and thereby decrease oxyfluorfen contamination in food crops. (C) 2018 Elsevier B.V. All rights reserved.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序