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| DOI：10.13522/j.cnki.ggps.2017.0602 |
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| The Role of Clay in Retarding Solute Transport in Inshore Aquifers |
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YANG Yi， XING Liting， LI Changsuo， ZHANG Wenjing， HUANG Linxian
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School of Resource and Environment, University of Jinan, Ji’nan 250022, China; Shandong Province Geotechnical Engineering Investigation Institute, Ji’nan 250014, China
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| Abstract: |
| 【Objective】 Hydro-geochemistry of groundwater is controlled by the minerals of the aquifer and the purpose of this paper is to study the role of clay in modulating the salinity of an inshore aquifer. 【Method】 Clay and saline groundwater samples were taken from different depths via drilling and pumping tests in hydrogeological investigations of an inshore aquifer. The impact of clay content on retardation of chemical transport was investigated by real-time monitoring groundwater quality, isothermal adsorption measurement, factor analysis and correlation analysis.【Result】 The isothermal adsorption of Na+, Ca2+, Mg2+ to the clay in the aquifer can be fitted to the Henry formula and the Langmuir formula. The retardation of Na+, Ca2+ and Mg2+ by the clay changed along the depth due to the variations in the minerals types and minerals contents, with Na+ adsorption much stronger than Ca2+ and Mg2+ . 【Conclusion】 Retardation of the three ions by the clay affects the formation of chemical zonation and salinity of the groundwater. |
| Key words: clay; adsorption isothermal equation; retarding action; groundwater chemistry composition; inland plains |
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