School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China.
Engineering Technology Institute for Groundwater Numerical Simulation and Contamination Control, Jinan 250022, China.
Int J Environ Res Public Health. 2018 Aug 22;15(9):1816. doi: 10.3390/ijerph15091816.
In order to increase understanding of the hydrogeochemical effects that influence changes in the quality of salt water, we investigated the distribution of saline and fresh water in an inland plain area and, in particular, the scarcity of fresh water resources. Taking the inland plain in Jiyang County as a specific case study, samples of undisturbed clay and underground saline water from different depths were collected to examine hydrogeological changes. A wide variety of methods was used to analyze the blocking effect of clay on the chemical characteristics of the groundwater. These include real-time monitoring for field water quality, tests for isothermal adsorption, a factor analysis model, physiochemical analysis, and correlation analysis. Our results show that the optimal adsorption isotherm of clay for Na⁺, Ca and Mg in groundwater conform to the established Henry and Langmuir equations for adsorption isotherms. The influence of clay mineral types and content on the blockage of Na⁺, Ca and Mg in groundwater samples were evident at different depths, with the clay adsorption capacity increasing in line with increases in the clay mineral content. Clay at different depths was found to have the strongest blocking effect on Na⁺ in groundwater, being systematically greater than its effect on Ca and Mg. It is believed that the blocking effect of clay has an important influence on the hydrochemical zoning of groundwater in inland plains and the formation of saline water in groundwater systems. This study therefore provides concrete evidence in support of this supposed effect.
为了提高对影响咸水水质变化的水文地球化学效应的认识，我们调查了内陆平原地区咸水和淡水的分布情况，特别是淡水资源的匮乏。以内陆平原的济阳地区为例，采集了未受干扰的粘土和不同深度的地下咸水样本，以研究水文地质变化。采用了多种方法来分析粘土对地下水化学特性的阻断效应。这些方法包括现场水质实时监测、等温吸附试验、因子分析模型、物理化学分析和相关分析。我们的结果表明，粘土对地下水中 Na⁺、Ca 和 Mg 的最佳吸附等温线符合已建立的 Henry 和 Langmuir 吸附等温线方程。粘土矿物类型和含量对不同深度地下水样品中 Na⁺、Ca 和 Mg 阻断的影响明显，随着粘土矿物含量的增加，粘土的吸附能力也随之增加。不同深度的粘土对地下水 Na⁺的阻断作用最强，其对 Ca 和 Mg 的阻断作用明显大于 Ca 和 Mg。研究认为，粘土的阻断作用对内陆平原地下水的水文地球化学分区和地下水系统中盐水的形成有重要影响。因此，该研究为这种假设的效应提供了具体证据。
