Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, People's Republic of China.
Environ Geochem Health. 2018 Aug;40(4):1209-1219. doi: 10.1007/s10653-017-0037-0. Epub 2017 Oct 23.
It is necessary to identify the hydrogeochemical processes and analyze the causes of groundwater pollution due to the lack of knowledge about the groundwater chemical characteristics and the endemic diseases caused by groundwater pollution in the northern Ordos Cretaceous Basin. In this paper, groundwater chemical facies were obtained using the piper trilinear diagram based on the analysis of 190 samples. The hydrogeochemical processes were identified using ionic ratio coefficient, such as leaching, evaporation and condensation. The causes and sources of groundwater pollution were analyzed by correspondence analysis, and the spatial distribution and enrichment reasons of fluoride ion were analyzed considering the endemic fluorosis emphatically. The results show that leaching, evaporation and condensation, mixing, and anthropogenic activities all had significant impact on hydrogeochemical processes in the study area. However, cation exchange and adsorption effects were strong in the S2 and S3 groundwater flow systems, but weak in S1. Groundwater is mainly polluted by Mn and COD in the study area. The landfill leachate, domestic sewage, and other organic pollutants, excessive use of pesticides and fertilizers in agriculture, and pyrite oxidation from long-term and large-scale exploitation of coal are the sources of groundwater pollution. The S1 has the highest degree of groundwater pollution, followed by S2 and S3. High concentration of fluoride ion is mainly distributed in the north and west of study area. Evaporation and condensation and groundwater chemistry component are the most important causes of fluoride ion enrichment. The results obtained in this study will be useful for understanding the groundwater quality for effective management and utilization of groundwater resources and assurance of drinking water safety.
由于缺乏对鄂尔多斯白垩纪盆地北部地下水化学特征和地下水污染引发地方病的了解，因此有必要识别水文地球化学过程并分析地下水污染的原因。本文通过对 190 个样本的分析，利用皮叶三角图得到地下水化学相。利用离子比率系数（如淋溶、蒸发和冷凝）识别水文地球化学过程。通过对应分析分析地下水污染的原因和来源，并考虑地方性氟中毒，重点分析氟离子的空间分布和富集原因。结果表明，淋溶、蒸发和冷凝、混合以及人为活动均对研究区水文地球化学过程有显著影响。然而，阳离子交换和吸附作用在 S2 和 S3 地下水流动系统中较强，而在 S1 中较弱。研究区地下水主要受 Mn 和 COD 污染。垃圾渗滤液、生活污水和其他有机污染物、农业过度使用农药和化肥以及长期大规模开采煤炭导致的黄铁矿氧化是地下水污染的来源。S1 区地下水污染程度最高，其次是 S2 和 S3。高浓度氟离子主要分布在研究区的北部和西部。蒸发和冷凝以及地下水化学组分是氟离子富集的最重要原因。本研究结果将有助于了解地下水水质，从而有效管理和利用地下水资源，确保饮用水安全。
