期刊
ENVIRONMENTAL POLLUTION
卷 180, 期 -, 页码 84-91出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.05.010
关键词
Arsenic; Microbial mobilization; arrA; dsrB; Realgar
资金
- Czech Science Foundation [P210/10/P096]
- Ministry of Education, Youth, and Sports of the Czech Republic [MSM 0021620855, MSM 0021620858]
- Academy of Sciences of the Czech Republic [AVOZ30130516, RVO68081715]
- [SVV-2013-267 201]
Critical factors leading to arsenic release and attenuation from the shallow subsurface were studied with multidisciplinary approach in the natural gold-arsenic geochemical anomaly at Mokrsko (Czech Republic). The results show that microbial reduction promotes arsenic release from Fe(III) (hydr)oxides and Fe(III) arsenates, thereby enhancing dissolved arsenic in the shallow groundwater at average concentration of 7.76 mg/L. In the organic-rich aggregates and wood particles, however, microbial sulfate reduction triggers the formation of realgar deposits, leading to accumulation of As in the distinct organic-rich patches of the shallow subsurface. We conclude that precipitation of realgar in the shallow subsurface of soil/sediment depends on specific and non-trivial combination of water and rock chemistry, microbial community composition and spatial organisation of the subsurface zone, where speciation in saturated environments varied on a centimeter scale from reduced (decomposed wood, H2S and realgar present) to oxidized (goethite and arsenate minerals are present). (C) 2013 Elsevier Ltd. All rights reserved.
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