Wang Zhen, Pei Junling, Ruan Chuanxia, Adimalla Narsimha, Liu Haiyan, Guo Huaming
School of Water Resources and Environment Engineering, East China University of Technology, Nanchang, 330032, Jiangxi, China.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330032, Jiangxi, China.
Environ Geochem Health. 2024 Dec 5;47(1):7. doi: 10.1007/s10653-024-02316-5.
Understanding the hydrochemical evolution of surface water and groundwater is crucial for protecting regional ecological environments. Currently, there are few quantitative studies on the relative contributions of different processes to salinity enrichment of water bodies. In this study, sixty-seven water samples were collected for chemical, and isotopic analysis, along with simulation calculations. The results reveal distinct hydrochemical types of river water, phreatic water, lake water and hot spring water in the investigated area are Ca-Mg-HCO, Na-Ca-HCO, Na-SO-HCO and Na-HCO, respectively. Average temperature and depth of geothermal water storage are 196℃ and 1338 m, respectively. Average arsenic (As) content in hot spring water (298 μg/L) higher than that in lake water (39.2 μg/L), river water (9.59 μg/L) and phreatic water (4.02 μg/L). The ∑REEs content of river water in the study area is much higher than that of phreatic water and lake water. Result of δD and δO indicate that atmospheric precipitation is the source of recharge for all water bodies in the study area. Quantitative calculations indicate that evapo-concentration significantly enriches lake water salinity, contributing on average 90% of its salt content. In contrast, mineral dissolution contributes predominantly to the salinity of hot spring water (90.7%), phreatic water (65.8%), and river water (45.2%). Evapo-concentration emerges as the dominant mechanism for lake water salinity, while carbonate mineral dissolution primarily affects river water. Phreatic water and hot spring water are mainly controlled by the weathering and dissolution of silicate. The results can provide a theoretical basis for the study of the formation mechanism of water salinity in other regions with similar geological environment in the world.
了解地表水和地下水的水化学演化对于保护区域生态环境至关重要。目前，关于不同过程对水体盐分富集的相对贡献的定量研究较少。在本研究中，采集了67个水样进行化学和同位素分析，并进行了模拟计算。结果表明，研究区河水、潜水、湖水和温泉水的水化学类型分别为Ca-Mg-HCO、Na-Ca-HCO、Na-SO-HCO和Na-HCO。地热水储存的平均温度和深度分别为196℃和1338米。温泉水中砷（As）的平均含量（298μg/L）高于湖水中的（39.2μg/L）、河水中的（9.59μg/L）和潜水中的（4.02μg/L）。研究区河水的∑REEs含量远高于潜水和湖水。δD和δO结果表明，大气降水是研究区所有水体的补给来源。定量计算表明，蒸发浓缩显著富集了湖水盐分，平均贡献了其盐分含量的90%。相比之下，矿物溶解对温泉水（90.7%）、潜水（65.8%）和河水（45.2%）的盐分贡献占主导。蒸发浓缩是湖水盐分的主导机制，而碳酸盐矿物溶解主要影响河水。潜水和温泉水主要受硅酸盐风化和溶解的控制。研究结果可为世界上其他地质环境相似地区水体盐分形成机制的研究提供理论依据。
