Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR018995 |
Decadal variations in groundwater quality: A legacy from nitrate leaching and denitrification by pyrite in a sandy aquifer | |
Jessen, Soren1; Postma, Dieke2; Thorling, Laerke3; Muller, Sascha1; Leskela, Jari1,4; Engesgaard, Peter1 | |
2017 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Denmark; Sweden |
英文摘要 | Twenty-five years of groundwater quality monitoring in a sandy aquifer beneath agricultural fields showed large temporal and spatial variations in major ion groundwater chemistry, which were linked closely to the nitrate (NO3) content of agricultural recharge. Between 1988 and 2013, the NO3 content of water in the oxidized zone of the aquifer nearly halved, following implementation of action plans to reduce N leaching from agriculture. However, due to denitrification by pyrite oxidation in the aquifer, a plume of sulfate-rich water migrates through the aquifer as a legacy of the historical NO3 loading. Agriculture thus is an important determinant of major ion groundwater chemistry. Temporal and spatial variations in the groundwater quality were simulated using a 2D reactive transport model, which combined effects of the historical NO3 leaching and denitrification, with dispersive mixing into the pristine groundwater residing deeper in the aquifer. Reactant-to-product ratios across reaction fronts are altered by dispersive mixing and transience in reactant input functions. Modelling therefore allowed a direct comparison of observed and simulated ratios of concentrations of NO3 (reactant) in the oxidized zone to those of SO4 (product) in the reduced zone, which aided a stoichiometric assessment of the mechanisms of denitrification. Denitrification by pyrite in the Rabis Creek aquifer results in oxidation of S-1 and Fe2+ in pyrite to S6+ in dissolved SO4 and Fe3+ in Fe-oxide. Neither precipitation of elemental sulfur (S-0), nor of jarosite, was supported by observations, and adsorption of sulfate was also dismissed. |
英文关键词 | nitrate denitrification sulfate pyrite reactive transport modeling |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394911200011 |
WOS关键词 | RABIS-CREEK ; THIOBACILLUS-DENITRIFICANS ; MULTICOMPONENT TRANSPORT ; NITROGEN EMISSIONS ; CHROMIUM REDUCTION ; UNSATURATED ZONE ; WATER CHEMISTRY ; DENMARK ; OXIDATION ; SEDIMENTS |
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/20143 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Copenhagen UCPH, Dept Geosci & Nat Resource Management IGN, Copenhagen K, Denmark; 2.Geol Survey Denmark & Greenland GEUS, Dept Geochem, Copenhagen K, Denmark; 3.Geol Survey Denmark & Greenland GEUS, Dept Groundwater & Quaternary Geol Mapping, Aarhus C, Denmark; 4.SWECO Environm, Drottningtorget 14, Malmo, Sweden |
推荐引用方式 GB/T 7714 | Jessen, Soren,Postma, Dieke,Thorling, Laerke,et al. Decadal variations in groundwater quality: A legacy from nitrate leaching and denitrification by pyrite in a sandy aquifer[J]. WATER RESOURCES RESEARCH,2017,53(1). |
APA | Jessen, Soren,Postma, Dieke,Thorling, Laerke,Muller, Sascha,Leskela, Jari,&Engesgaard, Peter.(2017).Decadal variations in groundwater quality: A legacy from nitrate leaching and denitrification by pyrite in a sandy aquifer.WATER RESOURCES RESEARCH,53(1). |
MLA | Jessen, Soren,et al."Decadal variations in groundwater quality: A legacy from nitrate leaching and denitrification by pyrite in a sandy aquifer".WATER RESOURCES RESEARCH 53.1(2017). |
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