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Effects of Fe(II)-induced transformation of scorodite on arsenic solubility
Jimei Zhou; Yizhang Liu; Hongling Bu; Peng Liu; Jing Sun; Fei Wu; Jian Hua; Chengshuai Liu
2022
Source PublicationJournal of Hazardous Materials
Volume429Pages:128274
Abstract

Scorodite (FeAsO4 center dot 2H(2)O) is a pivotal secondary ferric arsenate that immobilizes most of arsenic (As) in acidic As contaminated environments, but secondary As pollution may occur during dissolution of scorodite in environments involving redox changes. Reductive dissolution of scorodite by coexisting dissolved Fe2+ (Fe(II)(aq)) under anaerobic conditions and its effects on the behavior of As have yet to be examined. Here, this study monitored the changes in mineralogy, solubility and speciation of As during scorodite transformation induced by Fe(II) under anaerobic conditions at pH 7.0 and discussed the underlying mechanisms. Mossbauer and X-ray diffraction (XRD) analysis showed the formation of parasymplesite and ferrihydrite-like species during scorodite transformation, which was highly controlled by Fe(II)aq concentrations. 1 mM Fe(II)(aq) enhanced As mobilization into the solution, whereas As was repartitioned to the PO43--extractable and HCl-extractable phases with 5 and 10 mM Fe(II). The neo-formed parasymplesite and ferrihydrite-like species immobilized dissolved As(V) through adsorption and incorporation. Additionally, As(V) reduction occurred during Fe(II)-induced scorodite transformation. Our results provide new insights into the stability and risk of scorodite in anaerobic environments as well as the geochemical behavior of As in response to Fe cycling.

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KeywordScorodite Fe(Ii)-induced Transformation Parasymplesite Ferrihydrite-like arsenic Repartition
DOI10.1016/j.jhazmat.2022.128274
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Indexed BySCI
Language英语
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Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13480
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China
2.University of Chinese Academy of Sciences, Beijing 100049, PR China
3.National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, PR China
4.School of Environmental Studies & State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China
5.School of Resources and Environmental Science, Wuhan University, Wuhan 430079, PR China
Recommended Citation
GB/T 7714
Jimei Zhou,Yizhang Liu,Hongling Bu,et al. Effects of Fe(II)-induced transformation of scorodite on arsenic solubility[J]. Journal of Hazardous Materials,2022,429:128274.
APA Jimei Zhou.,Yizhang Liu.,Hongling Bu.,Peng Liu.,Jing Sun.,...&Chengshuai Liu.(2022).Effects of Fe(II)-induced transformation of scorodite on arsenic solubility.Journal of Hazardous Materials,429,128274.
MLA Jimei Zhou,et al."Effects of Fe(II)-induced transformation of scorodite on arsenic solubility".Journal of Hazardous Materials 429(2022):128274.
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