Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR019666 |
The influence of mixing on stable isotope ratios in porous media: A revised Rayleigh model | |
Druhan, Jennifer L.1,2; Maher, Kate2 | |
2017-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | For an irreversible reaction, the Rayleigh or distillation-type relationship between stable isotope enrichment and reactant concentration is compromised if fluid samples are characterized by a range of water ages or different extents of reaction progress. Such mixed samples are rarely avoided in the standard methods of sampling fluid from natural porous media. As a result, application of a Rayleigh model to stable isotope ratios measured in aquifers commonly requires a diminished or effective fractionation factor relative to the intrinsic value obtained in the absence of transport effects. Thus, quantitative application of intrinsic parameter values to a fractionating reaction occurring in porous media flow requires revision to the functional form of the relationship between reactant concentration and isotope fractionation. Here we derive a series of analytical solutions for the relationship between fractionation and flow subject to nonuniform fluid travel time distributions. These solutions are unique from previous approaches in that they avoid the use of a dispersion coefficient. The results are demonstrated against multicomponent reactive transport simulations of stable isotope fractionation in homogeneous and spatially correlated heterogeneous flow fields, and applied to a data set of stable chromium (Cr) isotope enrichment obtained from a contaminated aquifer. We show that the flux-weighted isotope ratio of a solute is more sensitive to the effects of physical heterogeneity than solute concentrations. Our results support an updated functional form of the traditional Rayleigh model that describes the relationship between reactant concentration and isotope fractionation and is valid for a mixed-fluid sample. |
英文关键词 | isotope fractionation fluid travel time reactive transport |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398568800007 |
WOS关键词 | FRACTIONATION FACTORS ; HEXAVALENT CHROMIUM ; MINERAL DISSOLUTION ; MAGNESITE DISSOLUTION ; GROUNDWATER SYSTEMS ; SCALE-DEPENDENCE ; TRANSPORT ; REDUCTION ; NITROGEN ; RATES |
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/20827 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Illinois, Dept Geol, Champaign, IL 61820 USA; 2.Stanford Univ, Dept Geog & Environm Sci, Stanford, CA 94305 USA |
推荐引用方式 GB/T 7714 | Druhan, Jennifer L.,Maher, Kate. The influence of mixing on stable isotope ratios in porous media: A revised Rayleigh model[J]. WATER RESOURCES RESEARCH,2017,53(2). |
APA | Druhan, Jennifer L.,&Maher, Kate.(2017).The influence of mixing on stable isotope ratios in porous media: A revised Rayleigh model.WATER RESOURCES RESEARCH,53(2). |
MLA | Druhan, Jennifer L.,et al."The influence of mixing on stable isotope ratios in porous media: A revised Rayleigh model".WATER RESOURCES RESEARCH 53.2(2017). |
条目包含的文件 | 条目无相关文件。 |
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