江西兴国县偏酸性地下水研究现状

Research Status of Partial Acid Groundwater in Xingguo County, Jiangxi Province

兴国县浅层地下水为各城镇和农村的主要饮用水源,浅层地下水中酸性地下水(p H<6.5)分布范围占全区面积的1/2,区域地下水酸化现象较为明显,已成为该地区安全用水问题之一。中国地质调查局根据原国土资源部的统一部署,于2017年启动了兴国水文地质调查工作。基于768组地下水现场水质测试和80组相关水化学分析资料,本文研究了兴国县偏酸性地下水的分布特征及其影响因素。结果发现:pH<6.5的偏酸性地下水分布普遍,主要分布于花岗岩类裂隙水中,地下水pH值受当地酸雨影响明显,与酸性土壤分布吻合,与含水介质类型密切相关,随地下水位埋深的增加,pH值增大。本研究对正确认识偏酸性地下水分布特征与影响因素,促进城镇农村居民安全用水,为预防地下水酸化污染具有重要意义。

Shallow groundwater is the main source of drinking water in Xingguo towns and villages,the distribution of acid groundwater(pH<6.5)in the shallow groundwater is 1/2 of the whole area,and regional groundwater acidification is obvious.It has become one of the problems of safe water in the area.In accordance with the uniform deployment of the former Ministry of Land and Resources,China Geological Survey commenced the hydrogeological survey work in Xingguo County of Jiangxi Province in 2017.Based on 768 groups of groundwater on-site water quality tests and 80 groups of related hydrochemical analysis data,the authors studied the distribution characteristics and influencing factors of partial acid groundwater in Xingguo County.The result shows that acidic groundwater with pH<6.5 is quite common.Acid groundwater is mainly distributed in granite fissure water,the pH value of groundwater is obviously affected by local acid rain,consistent with the acidic soil distribution.It is closely related to the types of water-bearing media.With the increase of water depth,the pH value of groundwater increases.This study is of great importance for correct understanding of the distribution characteristics and influencing factors of partial acidic groundwater,and for promoting safe water use for urban and rural residents as well as preventing acidification pollution of groundwater.