Distribution and formation factors of high fluoride deep groundwater in typical area of north Anhui Province
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摘要: 选取皖北典型区深层地下水的氟作为研究对象，在资料收集、水文地质调查、采样测试的基础上，获取了81个深层地下水及71个浅层地下水样品的测试数据。综合运用描述性统计、相关性分析、离子比例系数和Piper图示法，分析深层水氟的分布特征、来源及形成影响因素，结果表明：皖北典型区的深层地下水氟含量具有四周低、中部高的特点；高氟水多呈弱碱性，依据水化学类型特征可将该研究区划分为三个系统：亳州系统、阜阳系统和蒙城系统。亳州系统多为Cl—Na型水，阜阳系统多为HCO3—Na型水，蒙城系统较复杂，包括Cl—Na型、HCO3·SO4·Cl—Na型、HCO3—Ca·Mg型及HCO3—Na·Mg·Ca型水；深层地下水中氟的主要来源是含氟矿物的溶解；弱碱性水、溶解/沉淀作用和阳离子交替吸附作用是影响皖北典型区深层地下水氟形成的主要影响因素。Abstract: The fluorine of the deep groundwater in the typical area of north Anhui Province was selected as the object of interest in this work. On the basis of data collection, hydrogeological survey and sample analysis, the data of 81 deep groundwater samples and 71 shallow groundwater samples were determined.Fluorine distributions, fluorine sources, and factors that influence the fluorine formation of the deep groundwater were analyzed via descriptive statistics, correlation analysis, ion ratio coefficient and Piper graphic method.The results demonstrate that the fluorine of the deep groundwater in this area was characterized by low concentration in the edge area, high concentration in the middle area, and weak alkaline in high fluoride water. Based on hydrochemical type characteristics, the area of interest was divided into three systems: Bozhou, Fuyang and Mengcheng systems. Among the three systems, the water type of most samples in Bozhou system and Fuyang system were Cl—Na and HCO3—Na, respectively.However, the Mengcheng system was complex, and included more water types such as Cl—Na, HCO3·SO4·Cl—Na, HCO3—Ca·Mg and HCO3—Na·Mg·Ca. Fluorine minerals dissolution was the main source of fluorine in deep groundwater.Weak alkaline water, dissolution/precipitation and cationic alternate adsorption were major factors that influence the fluorine formation of deep groundwater in typical area of north Anhui Province.
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Key words:
- typical area of north Anhui Province /
- deep groundwater /
- high fluorine
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