新疆巴里坤-伊吾盆地平原区地下水无机组分环境背景值厘定及来源分析

Determine theBackground Values and Sources of Groundwater Inorganic Indicators in the Barkol-Yiwu Basin

为合理开发利用与保护巴里坤-伊吾盆地地下水,使用熵权水质指数法对该盆地平原区地下水水质进行适宜性评价,并对地下水无机指标环境背景值进行厘定和污染程度评价,最后使用绝对主成分-多元线性回归模型对主要无机指标进行来源分析。结果表明:10%以下的地下水样本水质较差,不适合饮用,其中对水质影响较大的无机指标为Na^(+)、SO_(4)^(2-)和TDS,次为Cl^(-)、NO_(3)^(-)-N、Ca^(2+)、TH、Mg^(2+)和K^(+)。来源分析结果表明,TH、TDS、K、Na^(+)、Ca^(2+)、Mg^(2+)、Cl^(-)、SO_(4)^(2-)和HCO_(3)-主要受到盐岩风化溶解作用和阴阳离子交换作用的影响,F^(-)主要源于萤石的溶解,NO_(3)^(-)-N主要来源于人类活动中农业活动的污染。

In order to rationally develop,utilize and protect the groundwater in the Balikun-Yiwu Basin,the entropy weight water quality index method was used to evaluate the suitability of groundwater quality in the plain area of the basin,and the environmental background values of groundwater inorganic indicators were determined and the pollution degree was evaluated.Finally,the absolute principal component-multiple linear regression model was used to analyze the source of the main inorganic indicators.The results showed that less than 10%of the groundwater samples had poor water quality and were not suitable for drinking.The inorganic indicators that had a greater impact on water quality were Na^(+),SO_(4)^(2-)and TDS,followed by Cl^(-),NO_(3)^(-)-N,Ca^(2+),TH,Mg^(2+)and K^(+).The results of source analysis showed that TH,TDS,K,Na^(+),Ca^(2+),Mg^(2+),Cl^(-),SO_(4)^(2-)and HCO_(3)-were mainly affected by weathering and dissolution of salt rock and anion-cation exchange.F^(-)was mainly derived from the dissolution of fluorite,and NO_(3)^(-)-N was mainly derived from the pollution of agricultural activities in human activities.