期刊
ENVIRONMENTAL POLLUTION
卷 178, 期 -, 页码 254-263出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.02.028
关键词
Redox cycling; Redox oscillation; Flooding; Arsenic mobility; Floodplains; Water fluctuating zone (WFZ)
资金
- AquaTRAIN Marie Curie Research Training Network [MRTN-CT-2006-035420]
- European Commission
Arsenic contamination of floodplain soils is extensive and additional fresh arsenic inputs to the pedosphere from human activities are ongoing. We investigate the cumulative effects of repetitive soil redox cycles, which occur naturally during flooding and draining, on a calcareous fluvisol, the native microbial community and arsenic mobility following a simulated contamination event. We show through bioreactor experiments, spectroscopic techniques and modelling that repetitive redox cycling can decrease arsenic mobility during reducing conditions by up to 45%. Phylogenetic and functional analyses of the microbial community indicate that iron cycling is a key driver of observed changes to solution chemistry. We discuss probable mechanisms responsible for the arsenic immobilisation observed in-situ. The proposed mechanisms include, decreased heterotrophic iron reduction due to the depletion of labile particulate organic matter (POM), increases to the proportion of co-precipitated vs. aqueous or sorbed arsenic with alpha-FeOOH/Fe(OH)(3) and potential precipitation of amorphous ferric arsenate. (C) 2013 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据