Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025492 |
Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model | |
Gao, Z. P.1,2,3; Jia, Y. F.2,3,4; Guo, H. M.1,2,3; Zhang, D.1,2,3; Zhao, B.1 | |
2020-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | High arsenic (As) groundwater is frequently found in inland basins, yet the contributions of different processes to aqueous As distributions remain unresolved. In the Hetao Basin, a typical inland basin, groundwater As concentrations generally increased from the alluvial fan through the transition area to the flat plain. A geochemical process-based reactive transport model was established to evaluate and quantify the processes of As mobilization in the northwestern Hetao Basin. Thirty-six groundwater samples and eight sediment samples were collected from the alluvial fan to the flat plain to investigate the geochemical characteristics of the groundwater system. Along the approximate flow path, groundwater evolved from oxic-suboxic conditions to anoxic conditions, with increasing concentrations of As, Fe (II), and NH4+, and decreasing Eh and SO42-/Cl-. Modeling results indicated that the observed concentrations of Fe (II) were caused by reductive dissolution of Fe (III) oxides and subsequent precipitation of mackinawite and siderite. Reductive dissolution of Fe (III) oxides was primarily driven by organic matter degradation (>75%), followed by H2S oxidation (<25%). More As was sequestered by mackinawite precipitation and adsorption than that released via abiotic reduction of Fe (III) oxides by H2S. Reductive dissolution of Fe (III) oxides was the dominant mechanism for liberating As in both the transition area and the flat plain (>70%), and As desorption under elevated pH and competitive adsorption by HCO3- and PO43- made an important contribution to As enrichment (up to 30%). Overall, this study provides an insight into the relative contributions of different geochemical processes to As enrichment in inland basins. Plain Language Summary Reductive dissolution of Fe (III) oxides via organic matter degradation and sulfide (H2S) oxidation, and As desorption induced by elevated pH and coexisting anions (e.g., HCO3- and PO43-) should be responsible for As mobility in anoxic aquifers in inland basins, where weakly alkaline pH and sulfidic conditions prevail. Quantifying these As mobility-related processes and their relative importance may improve our understanding of the geochemical processes causing As enrichment in aquifer systems in inland basins. We established a 1-D multicomponent redox process-controlled reactive transport model to quantify As release-related processes along an approximate flow path from the mountain to the flat plain in the Hetao Basin, China. The results showed that the reduction of Fe (III) oxides was mainly induced by organic matter degradation (>75%), followed by via H2S oxidation (<25%). Arsenic concentrations were depressed under sulfidic conditions due to As sequestration by mackinawite precipitation and adsorption, although abiotic H2S reduction of Fe (III) oxides contributed to the release of As. Overall, As was released through Fe (III) oxide reduction (>70%) and desorption under elevated pH and HCO3- and PO43- concentrations (<30%). This study provides an insight into the mechanisms of groundwater As mobilization in inland basins. |
英文关键词 | arsenic desorption Hetao Basin kinetic organic matter reductive dissolution |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535672800057 |
WOS关键词 | RED-RIVER FLOODPLAIN ; WESTERN HETAO BASIN ; IRON-OXIDE MINERALS ; SURFACE COMPLEXATION ; AQUIFER SEDIMENTS ; INNER-MONGOLIA ; SHALLOW AQUIFERS ; ORGANIC-MATTER ; MICROBIAL SULFATE ; MOBILIZATION |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/280509 |
专题 | 资源环境科学 |
作者单位 | 1.China Univ Geosci Beijing, State Key Lab Biogeol & Environm Geol, Beijing, Peoples R China; 2.China Univ Geosci Beijing, MOE Key Lab Groundwater Circulat & Environm Evol, Beijing, Peoples R China; 3.China Univ Geosci Beijing, Sch Water Resources & Environm, Beijing, Peoples R China; 4.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Gao, Z. P.,Jia, Y. F.,Guo, H. M.,et al. Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model[J]. WATER RESOURCES RESEARCH,2020,56(2). |
APA | Gao, Z. P.,Jia, Y. F.,Guo, H. M.,Zhang, D.,&Zhao, B..(2020).Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model.WATER RESOURCES RESEARCH,56(2). |
MLA | Gao, Z. P.,et al."Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model".WATER RESOURCES RESEARCH 56.2(2020). |
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