Shallow groundwater Sr environmental background value research in Tongren area, northeast Guizhou

In order to study the Sr content and hydrochemical characteristics of shallow groundwater in Tongren area of Guizhou province, we investigated 168 groups of shallow groundwater. We take the wall rocks are divided into sedimentary environment units. The difference environmental units distribution and evolution of Sr
²⁺
in groundwater were studied by means of mathematical statistics, graphical analysis, hydrochemical analysis and ion ratio. The conclusion is as follows : (1) the main source of Sr
²⁺
in groundwater in the study area is rock mineral weathering dissolution or dissolution, and its concentration is significantly affected by rock composition, which occurs in the platform strata and is controlled by carbonate rock weathering, and the clastic rock sedimentary environment is significantly affected by silicate weathering. (2) The concentration of strontium varies greatly in each environmental unit, among which the concentration is the highest and relatively uniform in the semi-confined platform environment, with a range of 0.196~0.362 mg/L, and the background range is only 0.015~0.059 mg/L in the restricted platform environment. However, due to the presence of a large number of rock salt mineralization points, the local maximum value is abnormal.