Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction
Zhu, M1,3; Tu, C1; Hu, XF1,3; Zhang, HB1,3; Zhang, LJ4; Wei, J1; Li, Y(李远)1,3; Luo, YM1,2,3; Christie, P1
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
2016-11-01
卷号569页码:1579-1586
关键词Diphenylarsinic Acid Solid-solution Partitioning Thionation Soil Incubation Experiment Scanning Transmission X-ray Microscopy
DOI10.1016/j.scitotenv.2016.07.001
作者部门中科院海岸带环境过程与生态修复重点实验室
英文摘要

Diphenylarsinic acid (DPAA) is a major organic arsenic (As) compound derived from abandoned chemical weapons. The solid-solution partitioning and transformation of DPAA in flooded soils are poorly understood but are of great concern. The identification of the mechanisms responsible for the mobilization and transformation of DPAA may help to develop effective remediation strategies. Here, soil and Fe mineral incubation experiments were carried out to elucidate the partitioning and transformation of DPAA in anoxic (without addition of sulfate or sodium lactate) and sulfide (with the addition of sulfate and sodium lactate) soil and to examine the impact of sulfate and Fe(III) reduction on these processes. Results show that DPAA was more effectively mobilized and thionated in sulfide soil than in anoxic soil. At the initial incubation stages (0-4 weeks), 6.7-74.5% of the total DPAA in sulfide soil was mobilized likely by sorption competition with sodium lactate. At later incubation stage (4-8 weeks), DPAA was almost completely released into the solution likely due to the near-complete Fe(III) reduction. Scanning transmission X-ray microscopy (STXM) results provide further direct evidence of elevated DPAA release coupled with Fe(III) reduction in sulfide environments. The total DPAA fraction decreased significantly to 24.5% after twoweeks and reached 3.4% after eightweeks in sulfide soil, whereas no obvious elimination of DPAA occurred in anoxic soil at the initial two weeks and the total DPAA fraction decreased to 10.9% after eight weeks. This can be explained in part by the enhanced mobilization of DPAA and sulfate reduction in sulfide soil compared with anoxic soil. These results suggest that under flooded soil conditions, Fe(III) and sulfate reduction significantly promote DPAA mobilization and thionation, respectively, and we suggest that it is essential to consider both sulfate and Fe( III) reduction to further our understanding of the environmental fate of DPAA. (C) 2016 Elsevier B.V. All rights reserved.

文章类型Article
资助机构National Natural Science Foundation of China(41571310 ; 41230858 ; 41201313)
收录类别SCI
语种英语
关键词[WOS]Chemical Warfare Agents ; Microbial Reduction ; Organic-matter ; Reducing Conditions ; Contaminated Soil ; Arsenic Mobility ; Transformation ; Ferrihydrite ; Sediments ; Release
研究领域[WOS]Environmental Sciences & Ecology
WOS记录号WOS:000382269000153
引用统计
被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.yic.ac.cn/handle/133337/17229
专题中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
中国科学院海岸带环境过程与生态修复重点实验室
通讯作者Luo, YM
作者单位1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat
2.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat
3.Univ Chinese Acad Sci
4.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil
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Zhu, M,Tu, C,Hu, XF,et al. Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016,569:1579-1586.
APA Zhu, M.,Tu, C.,Hu, XF.,Zhang, HB.,Zhang, LJ.,...&Christie, P.(2016).Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction.SCIENCE OF THE TOTAL ENVIRONMENT,569,1579-1586.
MLA Zhu, M,et al."Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction".SCIENCE OF THE TOTAL ENVIRONMENT 569(2016):1579-1586.
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