摘要
SO_4^(2-)作为岩溶地区水化学环境变化的重要指标之一,对研究流域水文地球化学过程的演化以及水资源的保护具有重要的意义.为探究白云岩地区池武溪流域SO_4^(2-)的分布特征及主要来源,通过运用Piper图、Gibbs图、主成分和灰色关联度方法,对该区域内地下水和地表水共44个水样的水化学相关阴阳离子(Sr^(2+)、Ca^(2+)、Mg^(2+)、Fe^(2+)、SO_4^(2-)和HCO_3^-等离子)进行系统性分析,结果表明,池武溪流域水化学类型主要分为两类:HCO_3-Ca型、HCO_3-Ca·Mg型,部分地下水水点是以SO_4-Ca型和SO_4-Ca·Mg型为主.在空间分布方面,地表水SO_4^(2-)浓度空间变化较平缓,SO_4^(2-)含量较高的区域主要集中在洞穴密集分布的水样点及其邻近区域,在河流交汇处SO_4^(2-)含量少,最低处仅有9.727 mg·L^(-1),地下水呈现以石膏晶洞、皮硝洞为中心,向两级逐渐递减的规律,最高值出现在石膏晶洞、皮硝洞附近,高达634.579 mg·L^(-1).Gibbs图表明,流域内岩溶水中的离子主要来源于岩石风化作用.主成分分析(PCA)结果说明,地表水与地下水存在明显的水力联系且流域内的离子来源于碳酸盐岩与硫酸盐岩的风化作用.灰色关联度排序结果表明,在天青石中SrSO_4的溶解和还原过程为主要作用,FeS_2、CaMg(CO_3)_2与石膏的综合作用,对流域内岩溶水的SO_4^(2-)有着重要的贡献,在地表水中的贡献率分别为0.772、0.701、0.681和0.663;地下水中分别为0.893、0.791、0.799和0.772.
This study deals with sulfate ions during the change of hydrochemical environment in Karst area,which is an important parameter in the evolution of hydrological processes and the protection of water resources in the basin.The main object of this project is to investigate the distribution and main sources of sulfate ions in the dolomite area of Chiwu River.A total of 44 water samples were collected and analyzed for the main cations（Sr^（2＋）、Ca^（2＋）、Mg^（2＋）、Fe^（2＋）、SO_4^（2-）、HCO_3^- et al.）by the methods of Piper diagram,Gibbs diagram,principal component and grey correlation.Results show that the hydrochemical types of Chiwu River surface water and groundwater were of calcium magnesium bicarbonate（HCO_3-Ca·Mg） and calcium bicarbonate（HCO_3-Ca）.However,the type of partial groundwater was SO_4-Ca or SO_4-Ca·Mg.In terms of spatial distribution,the concentration of sulfate in the surface water changed slightly and the high concentrations of sulfate were detected in the areas with a large number of caves and adjacent areas.The lowest sulfate content was located at the confluence of rivers,only 9.727 mg·L^（-1）.The concentration of sulfate ions has regularity in spatial variation,highest in the center of the Shigaojing Cave and Pixiao Cave and decreasing in the surrounding areas.The highest concentration of sulfate ions was detected near the Shigaojing Cave and Pixiao Cave,reaching 634.579 mg·L^（-1）.Gibbs diagram shows that the ions of karst water in the basin are mainly derived from the weathering effect of rocks.The results of principal component analysis（PCA） indicates that the surface water has obvious hydraulic connection with groundwater,and the ions in the basin originate from the weathering effect of carbonate rocks and sulfuric acid rocks.The results of the gray sequence showed that the dissolution and reduction of Sr SO_4 are the major processes in celestite as the main part.The combined effects of FeS_2,Ca Mg（CO_3）_2 and gypsum,made important contribution to the sulfate ions,contributing 0.772,0.701,0.681 and0.663 in the surface water and 0.893,0.791,0.799,0.772 in the ground water.
出处
《环境化学》
CAS
CSCD
北大核心
2017年第12期2690-2700,共11页
Environmental Chemistry
基金
国家自然科学基金(41361081
41301504)
贵州省科技计划项目(黔科合G字[2014]4004-2号)
贵州省重大应用基础研究项目(黔科合JZ字[2014]200201)
贵州省高层次创新型人才培养计划-"百"层次人才(黔科合平台人才[2016]5674)资助~~
关键词
喀斯特流域
水化学特征
SO42-
空间变化
离子来源
Karst Basin, hydro-chemical characteristics, sulfate, space variation, source of ion.
