论文摘要
The cumulative effects of periodic redox cycling on the mobility of As,Fe,and S from alluvial sediment to groundwater were investigated in bioreactor experiments.Two particular sediments from the alluvial floodplain of the Mekong Delta River were investigated:Matrix A（14 m deep）had a higher pyrite concentration than matrix B（7 m deep）sediments.Gypsum was present in matrix B but absent in matrix A.In the reactors,the sediment suspensions were supplemented with As（Ⅲ）and SO42-,and were subjected to three full-redox cycles entailing phases of nitrogen/CO2,compressed air sparging,and cellobiose addition.Major differences in As concentration and speciation were observed upon redox cycling.Evidences support the fact that initial sediment composition is the main factor controlling arsenic release and its speciation during the redox cycles.Indeed,a high pyrite content associated with a low SO42-content resulted in an increase in dissolved As concentrations,mainly in the form of As（Ⅲ）,after anoxic half-cycles;whereas a decrease in As concentrations mainly in the form of As（Ⅴ）,was instead observed after oxic half-cycles.In addition,oxic conditions were found to be responsible for pyrite and arsenian pyrite oxidation,increasing the As pool available for mobilization.The same processes seem to occur in sediment with the presence of gypsum,but,in this case,dissolved As were sequestered by biotic or abiotic redox reactions occurring in the Fe—S system,and by specific physico-chemical condition（e.g.pH）.The contrasting results obtained for two sediments sampled from the same core show that many complexes and entangled factors are at work,and further refinement is needed to explain the spatial and temporal variability of As release to groundwater of the Mekong River Delta（Vietnam）.
论文目录
文章来源
类型: 期刊论文
作者: Van T.H.Phan,Fabrizio Bardelli,Pierre Le Pape,Raoul-Marie Couture,Alejandro Fernandez-Martinez,Delphine Tisserand,Rizlan Bernier-Latmani,Laurent Charlet
来源: Geoscience Frontiers 2019年05期
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 环境科学与资源利用
单位: University Grenoble Alpes, CNRS, IRD, IFSTTAR, ISTerre,Ho Chi Minh City University of Technology (HCMUT), Vietnam National University, Ho Chi Minh City (VNU-HCM),Département de chimie, Université Laval,Ecole Polytechnique Fédérale de Lausanne (EPFL)-Environmental Microbiology Laboratory (EML),EPFL-ENAC-IIE-EML
基金: the financial support of the doctoral scholarship from University Grenoble Alpes and Geochemistry group (ISTerre),which is part of Labex OSUG@2020 (ANR10 LAB56)
分类号: X523
页码: 1715-1729
总页数: 15
文件大小: 2591K
下载量: 6
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