Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction
Zhu, M; Tu, C; Hu, XF; Zhang, HB; Zhang, LJ; Wei, J; Li, Y; Luo, YM; Christie, P; Luo, YM (reprint author), Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, 17 Chunhui Rd, Yantai 264003, Peoples R China.
2016
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
卷号569页码:1579-1586
文章类型期刊论文
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.
关键词Diphenylarsinic Acid Solid-solution Partitioning Thionation Soil Incubation Experiment Scanning Transmission X-ray Microscopy
DOI10.1016/j.scitotenv.2016.07.001
收录类别SCI
语种英语
WOS记录号WOS:000382269000153
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/26627
专题中科院上海应用物理研究所2011-2018年
通讯作者Luo, YM (reprint author), Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, 17 Chunhui Rd, Yantai 264003, Peoples R China.
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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.,...&Luo, YM .(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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