关键词: 水化学特征;水质评价;偏硅酸;峨眉山玄武岩;

Abstract: Emei Mountain basalt groundwater resources are abundant in Zhaojue County area of Sichuan Province.In order to ascertain the groundwater hydrochemical characteristics and water quality conditions in the study area, 76 groups of groundwater samples were taken from the Emei Mountain basalt region for hydrochemical testing from July to August 2019.The water chemical software was used to make a Piper′plot, and the Shoka Lev′s classification was performed on the water samples.The water chemical characteristics and sources were studied by descriptive analysis and correlation analysis using statistical software.Comprehensive assessment method of groundwater quality was used for water quality assessment.The results show that:(1) The groundwater chemistry type in the Emei Mountain basalt area is mainly HCO3-Ca·Mg type, followed by HCO3-Ca type, and the groundwater chemical composition has obvious spatial variability;(2) the comprehensive evaluation results of groundwater quality show that the quality of groundwater is generally good, and about 67.1% of the groundwater samples can meet the drinking water standards;(3) the metasilicic acid of 19 groundwater samples are greater than 25.0 mg/L,and 10 groups meet the class III water standard, the silic acid concentration meet the natural mineral water standard.It is recommended to carry out a natural drinking metasilicic acid mineral water evaluation work of a complete hydrological year.The research results provide scientific basis for groundwater resources exploration and mineral water industry development in the Zhaojue County.

Key words: hydrochemical characteristics; water quality evaluation; metasilicic acid; Emei Mountain Basalt;