中国北方高砷地下水分布特征及成因分析

An analysis of the distribution and formation of high arsenic groundwater in northern China

本文分析了银川平原北部饮水型砷中毒分布、水文地质条件和水化学特征,并探讨了地下水中砷离子分布规律和富集环境。研究表明:高砷地下水区呈两个条带状分布于冲湖积平原,主要为埋藏深度小于40m的潜水,水化学环境呈弱碱还原环境,水化学类型主要为HCO3-Na·Ca,Cl·HCO3-Na,Cl·HCO3-Na·Ca型;最后对比分析了中国北方内蒙古平原、山西大同盆地、新疆、吉林西部高砷地下水分布和环境地质特征。

This paper has analyzed the distribution, hydrogeological condition and hydrochemical characteristics of the drinking water type arseniasis in northern Yinchuan plain, and dealt with the distribution and enrichment environment of arsenic ions in groundwater. It is shown that the high arsenic groundwater is distributed in two zones in the alluvial lacustrine plain, and is mainly of unconfined water, with the buried depth of the groundwater table less than 40 m. The high arsenic groundwater is in a weakly alkaline and reducing environment, and the hydrochemical types are mainly HCO3-Na·Ca, Cl·HCO3-Na and Cl·HCO3-Na·Ca; This paper also makes a comparative study of the distribution and the environment geological features of high arsenic groundwater areas in northern China, which include Hetao plain in Inner Mongolian, Datong basin in Shanxi province, Xinjiang, and western Jilin Province.