Erratum to: Geochemical and environmental magnetic characteristics of high arsenic aquifer sediments from Datong Basin,northern China |
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| Authors: | Xianjun?Xie Email author" target="_blank">Yanxin?WangEmail author Mengyu?Duan Zuoming?Xie |
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| Institution: | (1) School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074 Wuhan, China |
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| Abstract: | Geochemical and environmental magnetic studies were carried out to identify the effect of iron oxyhydroxides on arsenic mobilization
in high arsenic aquifer system. Using high arsenic sediment samples from two boreholes, specifically drilled for this study,
chemical composition and magnetic properties including magnetic susceptibility, saturation remnant magnetization, and isothermal
remnant magnetization were measured. Results of correlation analysis of element contents show that arsenic and iron are closely
associated with each other (r
2 = 0.40, α = 0.05, n = 21). In contrast, the correlation of phosphorus with iron (r = 0.11, α = 0.05, n = 21) and arsenic (r
2 = 0.18, α = 0.05, n = 21) was poor, which might result from competitive adsorption of phosphorus and arsenic on the surface of Fe-oxyhydroxides.
The high correlation coefficients between arsenic contents and magnetic parameters suggest that the ferrimagnetic minerals
including maghemite and hematite are the dominant carrier of arsenic in aquifer sediments. The results of sequential extraction
experiments also revealed the association of arsenic with reducible iron oxides, such as maghemite and hematite in aquifer
sediments. Therefore, under reducing conditions, reductive dissolution and desorption of arsenic from Fe-oxyhydroxides into
the aqueous phase should be the dominant geochemical processes for its enrichment in groundwater at Datong.
An erratum to this article can be found at |
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| Keywords: | Arsenic Environmental magnetism Geochemistry Aquifer sediment Groundwater |
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