Biogeochemical processes of arsenic transformation and redistribution in contaminated soils: Combined effects of iron, sulfur, and organic matter
文献类型：期刊论文
| 作者 | Cai, Xiaolin; Yin, Naiyi; Liu, Xiaotong; Wang, Pengfei; Du, Huili; Cui, Yanshan; Hu, Zhengyi |
| 刊名 | GEODERMA
 |
| 出版日期 | 2022-09-15 |
| 卷号 | 422期号:0页码:115948 |
| ISSN号 | 0016-7061 |
| 关键词 | MICROBIAL SULFATE REDUCTION HUMAN GUT MICROBIOTA SEQUENTIAL EXTRACTION DISSIMILATORY REDUCTION PADDY SOILS WEST-BENGAL MOBILIZATION FERRIHYDRITE RELEASE WATER |
| 英文摘要 | Microbially-mediated mobilization of soil arsenic (As) is greatly influenced by the soil properties. However, in soils with contrasting iron (Fe), sulfur (S), and organic matter (OM) contents, the biogeochemical pathways controlling As transformation and distribution remain unclear. Using sequential soil As extraction and X-ray absorption spectroscopy (XAS), we investigated the causal mechanisms of As reduction and redistribution in five soils during microbial incubation. Incubation of arsenate (As(V))-reducing bacteria resulted in a significant arsenite (As(III)) release (21.6-61.9% of total soil As (As-total)). Thereafter, the re-immobilization of released As (III) was controlled by contrasting biogeochemical pathways, which were mainly dominated by soil Fe and S. For soil with high Fe content (191.1 g/kg), As immobilization is attributed to As(III)-readsorption by (neoformed) Fe(oxyhydr)oxides, despite the presence of abundant S (10.3 g/kg); while in soils with relatively low Fe content (25.9-35.6 g/kg) and high S content (1.4-1.7 g/kg), As-sequestration depends largely on As-sulfide formation (5-47% of solid-phase As), including realgar and orpiment-like phases. In contrast, released As remains in solution in soils with relatively low Fe (27.5-52.4 g/kg) and S contents (0.6-1.0 g/kg). Arsenic-XAS results show that all soil As fractions, including residual As(V), can potentially be reduced (34-92% of As-total), and solid-phase As(V) reduction was enhanced at higher OM content. Collectively, these results elucidate the dominant biogeochemical pathways controlling As fate in soils with different Fe, S, and OM contents. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/47755]  |
| 专题 | 生态环境研究中心_土壤环境科学实验室 |
| 通讯作者 | Cui, Yanshan |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China 2.Univ Chinese Acad Sci, Sino Danish Ctr Educ & Res, Beijing 101408, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cai, Xiaolin,Yin, Naiyi,Liu, Xiaotong,et al. Biogeochemical processes of arsenic transformation and redistribution in contaminated soils: Combined effects of iron, sulfur, and organic matter[J]. GEODERMA,2022,422(0):115948. |
| APA | Cai, Xiaolin.,Yin, Naiyi.,Liu, Xiaotong.,Wang, Pengfei.,Du, Huili.,...&Hu, Zhengyi.(2022).Biogeochemical processes of arsenic transformation and redistribution in contaminated soils: Combined effects of iron, sulfur, and organic matter.GEODERMA,422(0),115948. |
| MLA | Cai, Xiaolin,et al."Biogeochemical processes of arsenic transformation and redistribution in contaminated soils: Combined effects of iron, sulfur, and organic matter".GEODERMA 422.0(2022):115948. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。