贵州织金蒙家大坡地下水水化学特征分析

摘要

Hydrochemical characteristics are analyzed in Mengjiadapo groundwater system of Zhijin County , Guizhou Province .The results show that :Ca2+ ion is less influenced by the environment and minimum spatial variability ;Na+ ion is mostly affected and maximum spatial variability .There are significantly positive correlations between the ions and TDS and the order of correlation is Ca2+ ,SO2 -4 ,Mg2+ ,Cl- ,HCO3- ,K+ ,Na+ .The content of TDS increases with the increase of content of SO2-4 ion and the total hardness also increases with the increase of content of Ca2+ ion .The components of groundwater are mainly originated from the dissolving carbonate mineral and then from the dissolving sulfates mineral ,sulfur-bearing mineral ,silicate mineral and rock salt .However ,the hydrochemistry types in study area mainly turn into SO 4・HCO3-Ca type and HCO3・SO4 -Ca type in hydrochemical evolution .%通过对贵州织金蒙家大坡地下水水化学指标进行分析。结果表明，研究区地下水Ca2＋受环境影响最小、空间变异性最小，Na＋受环境影响最大、空间变异性最大；各阴阳离子含量与TDS含量呈显著正相关关系，其相关性依次为：Ca2＋＞SO2－4＞Mg2＋＞Cl－＞HCO3－＞K＋＞Na＋；TDS含量的增加主要受SO2－4离子的影响，总硬度的变化主要受Ca2＋的影响；地下水成分主要来自于碳酸盐矿物的溶解，其次是硫酸盐、含硫矿物、硅酸盐矿物以及盐岩的溶解，地下水类型主要向SO4・HCO3－Ca型和HCO3・SO4－Ca型转化。