山东泰安大汶口化工集聚区浅层地下水化学特征及成因分析

Hydrochemical Characteristics of Shallow Groundwater and the Origin Analysis in Dawenkou Chemical Industry Gathering Area in Tai'an City in Shandong Province

为查清山东泰安大汶口化工集聚区浅层地下水环境质量状况,采集地下水样品9组,运用统计分析、相关性分析、因子分析、离子比例关系和饱和指数法,查明研究区浅层地下水化学特征,分析地下水中各离子来源及控制因素。结果表明,研究区浅层地下水为淡水—微咸水,TDS介于0.98~2.40 g/L;阳离子以Ca^(2+)、Na^(+)为主,占阳离子含量的49.57%、38.56%,阴离子以Cl^(-)、HCO^(-)_(3)为主,占阴离子含量的52.81%、25.99%;水化学类型以Cl-Ca·Na为主;浅层地下水化学特征主要受岩石溶滤作用、人类活动因素的影响,二者的贡献率均为40%。在人类活动因素中,工业污染的贡献率达到了31%,说明人类活动因素对地下水环境造成了严重影响,且随着时间的推移,影响程度将更为显著。

In order to find out the environmental quality of shallow groundwater in Dawenkou chemical industry gathering area,9 groups of groundwater samples have been collected,by using statistical analysis,correlation analysis,factor analysis,ion proportional relationship and saturation index method in October 2021.Chemical characteristics of shallow groundwater in the study area has been identified,and the source and control factors of ions in groundwater have been analyzed.It is showed that:shallow groundwater in the study area is fresh water-brackish water,and the TDS is 0.98~2.40g/L.The cations are mainly Ca ^(2+)and Na^(+),and accounting for 49.57%and 38.56%of the cation content.The anions are mainly Cl^(-)and HCO^(-)_(3),and accounting for 52.81%and 25.99%of the anion content.Hydrochemical type is mainly Cl-Ca·Na.The formation of chemical characteristics of shallow groundwater is mainly influenced by rock leaching and human activities,both of which contribute 40%.Among human activities,the contribution rate of industrial pollution can reach 31%,second only to the contribution rate of rock leaching.It is indicated that human activities have a serious impact on the groundwater environment.Accompanying with the passage of time,the impact will be more significant.