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Biogeochemical processes of arsenic transformation and redistribution in contaminated soils: Combined effects of iron, sulfur, and organic matter
Cai, Xiaolin; Yin, Naiyi; Liu, Xiaotong; Wang, Pengfei; Du, Huili; Cui, Yanshan; Hu, Zhengyi
2022-09-15
Source PublicationGEODERMA
ISSN0016-7061
Volume422Issue:0Pages:115948
AbstractMicrobially-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.
Department土壤环境科学与技术实验室 ; 土壤环境科学与技术实验室
KeywordMICROBIAL SULFATE REDUCTION HUMAN GUT MICROBIOTA SEQUENTIAL EXTRACTION DISSIMILATORY REDUCTION PADDY SOILS WEST-BENGAL MOBILIZATION FERRIHYDRITE RELEASE WATER
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47755
Collection土壤环境科学实验室
Corresponding AuthorCui, Yanshan
Affiliation1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, Sino Danish Ctr Educ & Res, Beijing 101408, Peoples R China
Recommended Citation
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.
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