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宁夏自治区西吉县地下水中硫酸盐(SO42-)含量普遍超标,为了查明地下水中SO42-的来源,对区内36件地下水样品的水化学组成、21件岩石样品的易溶盐组分和10件地下水样品硫同位素组成进行了测试分析。结果表明:SO42-是区内地下水中主要阴离子组分,在区域上具有北部低,中部和南部高的明显的分带性,并且沿着地下水流向SO42-含量逐渐升高;SO42-也是区内第三系地层中主要的易溶盐组分,以石膏和芒硝形式存在;区内地下水中SO42-主要来源于地层中石膏和芒硝(所占比例平均为83%),其次是地层中的硫化物(所占比例平均为17%)。
In order to find out the source of SO42- in groundwater, the water chemistry composition of 36 groundwater samples in the region, the soluble salt components of 21 rock samples and The sulfur isotope composition of 10 groundwater samples was tested and analyzed. The results show that SO42- is the main anionic component in the groundwater, with obvious zonality in the low, middle and southern parts of the northern part of the region, and the content of SO42- gradually increases along the groundwater flow. SO42- The main soluble salt component in the Tertiary strata exists in the form of gypsum and thenardite. SO42- in groundwater in the area mainly comes from the gypsum and thenardite in the strata (accounting for an average of 83%), followed by sulfidation in the strata Things (the average proportion of 17%).