河套平原临河区高砷地下水分布及水化学特征

Occurrence and hydrochemical characteristics of As-rich groundwater in the Linhe district of the Hetao Plain

摘要: 文章通过地质环境、地下水野外调查以及水质分析测试等方法手段,较系统地研究和分析了河套平原临河区高砷地下水的分布及水化学特征。结果表明,该区高砷地下水主要分布在调查区的西北部,在区域上属于河套平原的沉积中心地带,局部呈小片状分布,短距离内地下水中的砷含量变化较大;该区砷含量≥0.05mg/L的地下水绝大部分为微咸水(TDS为1～3g/L),个别为淡水(TDS<1g/L)和咸水(TDS为3～10g/L),其氧化还原电位(ORP)均显示负值的还原环境。通过与非高砷区的对比研究,高砷区地下水中的铁含量超标率明显高于非高砷区(58%),达到91.3%。研究认为该区域高砷地下水的形成与沉积环境和沉积物的特征有很大的关系。

Abstract: Based on field survey of geo-environment and groundwater environment and laboratory analysis of groundwater quality,distribution and hydro-chemical properties of groundwater with As in the Linhe District in the Hetao Plain in Inner Mongolia were systematically studied.Results show that groundwater with high As content mainly occurs in the north-west of the study area,where is the central belt of deposition in the Hetao Plain in terms of regional concept.In some local parts,its distribution appea...