论文部分内容阅读
柳江盆地北部牛心山地区存在高氟地下水,严重影响居民身体健康。本文选取牛心山地区为研究区,对其浅层地下水运用Piper三线图、Gibbs图、氯碱指数图和离子比例图等方法进行水化学特征及其形成作用分析研究,从矿物溶解与沉淀、离子交换作用角度探讨了地下水中氟的来源和富集机理。结果显示,研究区地下水离子以2+Ca、+Na和-3HCO为主,水体偏碱性,-F浓度超标点位于火成岩侵入边缘地带,水化学类型为:Ca-(Na)-HCO3、Ca-(SO4)-HCO3和Ca-(Cl)-SO4,高浓度的-F赋存在Ca-(Na)-HCO3型水中,地下水水化学组分主要受岩石风化作用的影响;水文地球化学过程和地质因素控制地下水化学特征和氟化物的来源、分布;方解石、石膏溶解于地下水作为2+Ca来源影响萤石的溶解与沉淀,阳离子交换作用改变地下水中指定阳离子浓度间接影响-F浓度,同时碱性环境中吸附在黏土矿物上-F被-OH取代,溶解平衡和离子交换是地下水径流中-F浓度变化的主要控制因素。
High-fluoride groundwater exists in Niushen Mountain in the northern part of Liujiang River Basin, seriously affecting the health of residents. In this paper, Niu Xinshan area was chosen as the study area, and its hydrochemical characteristics and its formation effects were analyzed using the Piper three-line diagram, Gibbs diagram, chlor-alkali index map and ion ratio map. The results of mineral dissolution and sedimentation, ion exchange From the angle of view, the sources and enrichment mechanism of fluorine in groundwater are discussed. The results show that the groundwater ions in the study area are dominated by 2 + Ca, + Na and -3HCO. Alkaline and -F concentrations of water bodies are located in the marginal zone of igneous intrusion. The chemical types of water are Ca- (Na) -HCO3, Ca - (SO4) -HCO3 and Ca- (Cl) -SO4, high concentrations of -F occur in Ca- (Na) -HCO3-type water, and the chemical composition of groundwater is mainly affected by the weathering of rocks; hydrogeochemical processes and Geological factors control the chemical characteristics of groundwater and the source and distribution of fluoride. Calcite and gypsum dissolve in groundwater as a source of 2 + Ca, which affects the dissolution and precipitation of fluorite. The cation exchange changes the concentration of -F in a given concentration of groundwater indirectly, In the sexual environment adsorbed on clay minerals-F is replaced by -OH, the equilibrium of dissolution and ion exchange is the main controlling factor of the concentration of -F in groundwater runoff.