Antimony Concentration and Distribution in Groundwater of Zi River Estuary and Source Analysis

To find out the characteristics of Sb content in groundwater of Quaternary basin on the Zi River estuary area, in this paper it studies the distribution characteristics of Sb concentration and sources of Sb in groundwater by collecting surface water and groundwater samples from the main stream and estuary area, combined the correlation analysis of $ {\rm{ \mathsf{ δ} }}^{2}\mathrm{H},{\rm{ \mathsf{ δ} }}^{18}\mathrm{O} $ stable isotopes, hydrochemistry and Sb content. In non-flood season, the concentration of Sb in main streams of Zi River belongs to type C (> 5 μg/L), Zhixi River belongs to type B (1-5 μg/L), and other surface water samples belong to type A (< 1 μg/L). During flood period, all the surface water systems belong to type B. Type A areas of phreatic water were mainly distributed on part of plain area, lakeside area and Zi River bank which are at hills or hillock areas. Type B areas were those located at Quanjiao River and most of the plain area. Part of confined water was type A and the rest was type B. Fracture water which was affected by structural faults belongs to type B, otherwise was type A.The dissolution of Sb bearing minerals in the aquifer is the source of Sb in confined water and fracture water. The groundwater recharge from surface water and irrigation water resulted in Sb enrichment in phreatic water.