Effects of Fe-S-As coupled redox processes on arsenic mobilization in shallow aquifers of Datong Basin, northern China

Environmental Pollution
Junwen ZhangZhizhen Wang

Abstract

High arsenic groundwater generally coexists with elevated Fe2+ concentrations (mg L-1 levels) under reducing conditions, but an explanation for the extremely high arsenic (up to ∼2690) concentrations at very low Fe2+ (i.e., μg L-1 levels) in groundwater of Datong Basin remains elusive. Field groundwater investigation and laboratory microcosm experiments were implemented in this study. The field groundwater was characterized by weakly alkaline (pH 7.69 to 8.34) and reducing conditions (Eh -221.7 to -31.9 mV) and arsenic concentration averages at 697 μg L-1. Acinetobacter (5.9-51.3%), Desulfosporosinus (4.6-30.2%), Brevundimonas (3.9-19%) and Pseudomonas (3.2-14.6%) were identified as the dominant genera in the bacterial communities. Bacterially mediated arsenate reduction, Fe(III) reduction, and sulfate reduction are processes occurring (or having previously occurred) in the groundwater. Results from incubation experiment (27 d) revealed that nitrate, arsenate, and Fe(III)/sulfate reduced sequentially with time under anoxic conditions, while Fe(III) and sulfate reduction processes had no obvious differences, occurring almost simultaneously. Moreover, low Fe2+ concentrations were attributed to initially high pH conditions, which ...Continue Reading

Citations

Jan 6, 2021·The Science of the Total Environment·Yunling ZhangYuan Ren
Dec 31, 2018·Journal of Hazardous Materials·Tianliang ZhengTeng Ma
Mar 20, 2021·The Science of the Total Environment·Jie GaoHongchen Jiang
Jun 1, 2021·Geochimica Et Cosmochimica Acta·Anand KumarAlexander van Geen
Sep 17, 2019·Environmental Science & Technology·Richard T WilkinKirk G Scheckel

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