摘要
为了深入研究南宁市区地下水水化学特征、水质情况及地下水质量演变的主要水化学过程,文章采集南宁市区22组孔隙水和7组岩溶水,检测pH值、阴阳离子、溶解性总固体(TDS)和总硬度等化学指标,探讨地下水水化学特征和形成机制。结果表明:研究区孔隙水和岩溶水pH平均值均小于7,两种水TDS和总硬度基本一致,主要的阴离子(HCO3-、Cl-、SO42-)中含量最高的是HCO3-,平均分别为68.08mg/L和106.68mg/L;对于阳离子(Ca2+、Mg2+、K+、Na+),研究区孔隙水和岩溶水均表现为Ca2+≥Na+>Mg2+>K+,其中Ca2+的平均含量分别为24.04mg/L和31.34mg/L;地下水化学成分主要通过风化-溶滤作用与混合作用形成,地下水水化学类型为HCO-3–Ca2+型水;地质环境背景是地下水pH值普遍偏低的主要原因,人类活动对地下水的影响越来越重要,pH值和水化学类型改变均与经济发展、人口增加、工矿企业增加等人类活动密切相关。
For further studying the hydro-chemical characteristics of groundwater,understanding groundwa-ter quality,and revealing the hydrochemical processes that control the evolution of the groundwater quality, we collected 22 sets of pore water and 7 sets of karst water to measue pH,cation and anion,total dissolved solids （TDS）and total hardness,and studied hydrochemical characteristics and formation mechanism.The results show that the average pH of pore water and karst water are both below 7,and the values of TDS and total hardness are almost the same.The most anions in pore water and karst water are both HCO -3 ,with values 68.08 mg/L and 106.68 mg/L,respectively.The cations include Ca2 ＋ ≥Na＋ 〈Mg2 ＋ 〈K＋ ,the aver-age values of Ca2 ＋ are 24.04 mg/L and 31.34 mg/L,respectively.The groundwater hydrochemical composi-tions are formed by the weathered-leached effects and mixing action,groundwater hydro-chemistry type is HCO 3 - Ca type water.The geological environment is a major cause for the generally low pH value of groundwater.The impact of human activity on groundwater is increasingly important.The pH value and change of hydrochemical type are closely related to economic development,population increase,growth of industrial and mining enterprises and other human activity.
出处
《中国岩溶》
CAS
CSCD
北大核心
2015年第3期228-233,共6页
Carsologica Sinica
基金
中国地质调查局地质调查项目"西南主要城市地下水污染调查评价"(1212011121166)
广西重点实验室建设项目(14-045-06)共同资助
关键词
地下水
水化学特征
成因分析
南宁市区
groundwater
hydro-chemical characteristics
cause of formation
Nanning City
