山东霄云煤矿砂岩高氟地下水成因及健康风险评价

he high-fluoride groundwater of Jining Xiaoyun Coal Mine poses a huge threat to the safety of residents\' drinking water, since it is one of the important drinking water sources for residents in the mining area. In order to explore the formation mechanism of high-fluorine groundwater, a total of 16 groups of sandstone groundwater samples were collected from the mining area. Hydrochemical analysis, correlation analysis, sodium adsorption ratio and saturation index were carried out to analyze the distribution and formation reasons of high-fluorine sandstone groundwater. At the same time, the health risk evaluation model of non-carcinogens recommended by USEPA was used to evaluate the health risks of different recipients populations. The results show that the F- concentration of sandstone groundwater in the mining area is in the range of 0.97 ~ 5.23mg/L, and 93.7% of the samples exceed the standard. The high fluoride groundwater of sandstone in the mining area is mainly distributed in the middle and northwest of the mining area, and has the hydrochemical characteristics of weak alkalinity, high Na+, HCO3- and low Ca2+. The weak alkaline environment and the competitive adsorption of OH-, HCO- and F- are important reasons for the formation of high fluoride sandstone groundwater in the mining area. The dissolution of fluorite and the precipitation of calcite and dolomite are the main mechanisms for the formation of high fluoride groundwater in the mining area. The average non-carcinogenic health risk index of different recipients groups in the mining area are 5.11, 3.16 , 2.91 and 2.52 for infants, children, adult males and adult females, respectively, which all exceed the risk index threshold. It is suggested to speed up the development of efficient defluorination materials and technologies to ensure the safety of drinking water for residents in mining areas.