山阴水砷中毒区地下水砷的富集因素分析

通过对山阴地区66个地下水样中常量元素、微量元素及有机物分析,研究了山阴高砷地下水的水化学特性并在此基础上,结合该地区含水层沉积物矿物分析,探讨了地下水中砷富集的影响因素.结果表明,山阴地下水平均pH为8.09,磷酸根含量为0.71mg/L,溶解性有机物含量为5.14 mg/L,以及地下水处于还原环境.高pH值、高磷酸根含量及还原环境不利于含水介质对以阴离子形式存在的砷的吸附,高溶解性有机物含量则增加了砷的活性这些因素促使了含水介质中砷的解吸和迁移.

Analysis of Factors Resulting in Anomalous Arsenic Concentration in Groundwaters of Shanyin, Shanxi Province

The chemical characteristics of groundwaters containing anomalous arsenic were summarized and the factors influencing arsenic enrichment in groundwater were discussed in this paper, based on chemical data of general compositions, trace elements and organic matters of sixty-six groundwaters and mineral analysis of thirty aquifer matrix. The main factors inducing anomalous arsenic in groundwaters included high pH (8.09), high concentrations of phosphate (0.71 mg/L) and organic matters (5.14 mg/L), and anoxic environment. High pH, high phosphate content and anoxic environment made against adsorption of As into aquifer which contains clay minerals. And high concentration of organic matters promoted the activity of As in groundwater system. These factors contribute to desorption and transportation of As in aquifers.