摘要
以2014年新疆叶尔羌河流域平原区地下水水质样品分析结果为基础数据,对其浅层地下水(井深≤100m)运用统计分析法、Gibbs图、氯碱指数图等方法对该区地下水中氟的分布特征及影响因素进行分析。结果表明:2014年地下水水样中氟浓度超过我国饮用水标准(1.0mg/L)的比例为47.8%。Ⅰ型(F-<1.0mg/L)低氟地下水主要分布于河流补给较大的山前平原区;Ⅱ型(1.0mg/L≤F-<2.0mg/L)和Ⅲ型(F-≥2.0mg/L)高氟地下水广泛分布于河流补给小而潜水蒸发较强的承压水区。地下水氟浓度与各水化学指标具有一定的关系,高氟地下水一般具有较高的TDS,在HCO-3浓度较高的弱碱性环境中,能促进含水介质中的CaF2溶解,使地下水F-浓度升高。矿物饱和指数和氯碱指数以及Gibbs图反映了地下水主要受矿物溶解沉淀作用、阳离子交替吸附作用以及水岩作用和蒸发浓缩作用影响,而大气降水影响有限。
Based on the analysis results of groundwater quality samples in plain area of Yarkant river basin in Xinjiang in 2014, the spatial distribution characteristics and influence factors of fluoride in shallow groundwater(well depth≤100 m) in this area were analyzed by statistical analysis, Gibbs diagram and chlor-alkali index diagram. The results show that the rate of groundwater samples in which the fluoride concentration above the China’s drinking water standards of 1.0 mg/L accunt for 47.8%, in 2014. Type I(F-<1.0 mg/L) low-fluoride groundwater mainly distributes in the piedmont plain where the river recharges more. Type II(1.0 mg/L ≤F-<2.0 mg/L) and Type III(F-≥2.0 mg/L) high-fluoride groundwater widely distributes in the confined groundwater area where the river recharge is small and the phreatic water evaporates greatly. Groundwater fluoride concentration has a certain relationship with hydrochemical indexes. High fluoride groundwater generally has high TDS. In the weak alkaline environment with high HCO-3 concentration, it can promote the dissolution of CaF2 in water-bearing media and increase the fluoride concentration of groundwater. Mineral saturation index, chlor-alkali index and Gibbs diagram show that groundwater is mainly affected by mineral dissolution and precipitation, cation exchange adsorption, rock weathering and evaporation and concentration, while atmospheric precipitation has limited influence.
作者
张杰
周金龙
乃尉华
曾妍妍
陈云飞
ZHANG Jie;ZHOU Jinlong;NAI Weihua;ZENG Yanyan;CHEN Yunfei(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Hydrology and Water Resources Engineering Research Center,Urumqi 830052,China;No.2 Hydrogeology and Engineering Geology Party of Xinjiang Bureau of Geology and Mineral Resources Exploration and Development,Changji 831100,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2020年第4期100-106,共7页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(41662016)资助。
关键词
叶尔羌河流域
高氟地下水
水化学特征
Yarkant river basin
high-fluoride groundwater
hydrochemistry
