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Fe-CGS Effectively Inhibits the Dynamic Migration and Transformation of Cadmium and Arsenic in Soil

文献类型： 外文期刊

作者： Yin, Hongliang 1 ; Zhou, Changzhi 2 ; Wang, Junhuan 2 ; Yin, Mengxue 2 ; Wu, Zhihao 2 ; Song, Ningning 1 ; Song, Xin 1 ; Shangguan, Yuxian 3 ; Sun, Zaijin 4 ; Zong, Quanli 1 ; Hou, Hong 2 ;

作者机构： 1.Qingdao Agr Univ, Sch Resources & Environm, Qingdao 266109, Peoples R China

2.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

3.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu 610066, Peoples R China

4.Minist Ecol & Environm, Tech Ctr Soil Agr & Rural Ecol & Environm, Beijing 100012, Peoples R China

关键词： iron modification; coal gasification slag; cadmium; arsenic; leaching; stabilization

期刊名称：TOXICS （ 影响因子：4.6； 五年影响因子：4.8 ）

ISSN：

年卷期： 2024 年 12 卷 4 期

页码：

收录情况： SCI

摘要： The iron-modified coal gasification slag (Fe-CGS) material has excellent performance in purifying heavy-metal-contaminated water due to its good surface properties and adsorption capacities. However, it is unclear whether it can provide long-term simultaneous stabilization of Cd and As in composite-contaminated soils in extreme environments. This study investigated the long-term stabilization of Cd and As in acidic (JLG) and alkaline (QD) soils by simulating prolonged heavy rainfall with the addition of Fe-CGS. Multiple extraction methods were used to analyze the immobilization mechanisms of Cd and As in soil and their effects on bioavailability. The results indicate that the stabilization efficiency was related to the dosage of Fe-CGS. The concentrations of Cd and As in the JLG soil leachate were reduced by 77.6% (2.0 wt%) and 87.8% (1.0 wt%), respectively. Additionally, the availability of Cd and As decreased by 46.7% (2.0 wt%) and 53.0% (1.0 wt%), respectively. In the QD soil leachate, the concentration of Cd did not significantly change, while the concentration of As decreased by 92.3% (2.0 wt%). Furthermore, the availability of Cd and As decreased by 22.1% (2.0 wt%) and 40.2% (1.0 wt%), respectively. Continuous extraction revealed that Fe-CGS facilitated the conversion of unstable, acid-soluble Cd into oxidizable Cd and acid-soluble Cd. Additionally, it promoted the transformation of both non-specifically and specifically adsorbed As into amorphous iron oxide-bound and residual As. Fe-CGS effectively improved the soil pH, reduced the bioavailability of Cd and As, and blocked the migration of Cd and As under extreme rainfall leaching conditions. It also promoted the transformation of Cd and As into more stable forms, exhibiting satisfactory long-term stabilization performance for Cd and As.

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