宿州芦岭矿区浅层地下水化学特征及成因分析

Chemical Characteristics and Genesis of Shallow Groundwater in the Luling Mining Area, Suzhou

文章以宿州芦岭矿区浅层地下水为研究对象,结合统计分析、Piper三线图、Gibbs图和离子比例系数的方法分析研究区浅层地下水的水化学特性征及其成因,并开展了浅层地下水质量评价。结果表明:该区域浅层地下水pH均值为7.52,整体上属于偏弱碱性环境,TDS值介于397~933 mg/L,平均值为613 mg/L,属于淡水。水体阳离子以Na ,Mg2 为主,阴离子主要为HCO3-。水化学类型共有4种,分别为Mg-Na-Ca-HCO3型、Na-Mg-Ca-HCO3型、Na-Mg-HCO3型和Na-Mg-HCO3-Cl型。浅层地下水水化学特征的主要受岩石风化作用的影响,Na 和Cl−主要来源于岩盐溶解,Ca2 及Mg2 主要受碳酸盐的溶解。通过对水质进行评估,可以确定研究区的水质基本适合饮用,该区浅层地下水如果作为灌溉用水会给土壤或者作物带来中等程度的碱害风险。

The article takes the shallow groundwater in the Luling mining area of Suzhou as the research object, and analyses the hydrochemical characteristics and causes of the shallow groundwater in the study area by combining statistical analysis, Piper’s trilinear diagram, Gibbs’ diagram and ionic scale coefficient, and carries out the evaluation of the quality of the shallow groundwater. The results show that the pH of the shallow groundwater in the area is 7.52, which is a weakly alkaline environment overall. The water cations are mainly Na and Mg2 , while the anions are mainly HCO3-. There are four types of water chemistry, namely Mg-Na-Ca-HCO3 type, Na-Mg-Ca-HCO3 type, Na-Mg-HCO3 type and Na-Mg-HCO3-Cl type. The water chemistry of shallow groundwater is mainly influenced by rock weathering, with Na and Cl− mainly derived from rock salt dissolution, and Ca2 and Mg2 mainly from carbonate dissolution. The assessment of the water quality has determined that the study area is generally suitable for drinking and that the shallow groundwater in the area poses a moderate risk of alkali damage to soil or crops if used as irrigation water.