干旱区研究2025，Vol.42Issue(2)：258-273,16.DOI:10.13866/j.azr.2025.02.07
新疆阿克苏河流域高砷地下水化学特征及富集成因
Hydrochemical characteristics and enrichment mechanisms of high-arsenic groundwater in the Aksu River Basin,Xinjiang
摘要
Abstract
In the Aksu River Basin,20%of the domestic and irrigation water comes from groundwater,making it crucial to understand the distribution and formation of high-arsenic(As)groundwater in the area.Based on the hy-drochemical and isotope results,graphical methods were used to analyze the hydrochemical characteristics of the groundwater and the spatial distribution and forms of arsenic,revealing the As occurrence environment com-bined with geological,geomorphological,and hydrogeochemical processes.The results revealed that the single-structure phreatic water is alkaline oxidizing brackish water,the phreatic water in the confined water area is alka-line weakly oxidizing saline water,and the confined water is alkaline reducing fresh water.The As content ranged from 0.05 to 160µg·L-1,with a rate exceeding the standard of 19.5%.The hydrochemical types of high-As groundwater are mainly Cl·SO4-Na,SO4·Cl-Na·Ca,and Cl-Na,distributed in confined and phreatic water in the area downstream of the Aksu and Tailan Rivers at a depth of 10-42 m.From the mountainfront to the fine soil plain,the occurrence environment changes from weakly oxidizing to reducing.The As content and saturation in-dex of the groundwater generally exhibited an increasing trend.The single-structure phreatic water and confined water were mainly controlled by the water-rock interaction.In contrast,the phreatic water in the confined water areas was mainly controlled by the evaporation concentration.The distribution of groundwater As is mainly relat-ed to structural factors,with realgar dissolution being the primary natural source.The arid climate and the geolog-ical,geomorphological,and hydrogeological conditions create external conditions for the enrichment of high-As groundwater.Factors like pH,desulfurization process,Eh,and groundwater circulation patterns affect As release.This study helps us understand the formation and evolution of high-As groundwater in the Aksu River Basin,which is crucial for ensuring water supply safety.关键词
阿克苏河流域/高砷地下水/干旱地区/成因分析/赋存环境Key words
Aksu Rive Basin/high-arsenic groundwater/arid region/genesis analysis/occurrence environment引用本文复制引用
鲁力,葛燕燕,李升,张云..新疆阿克苏河流域高砷地下水化学特征及富集成因[J].干旱区研究,2025,42(2):258-273,16.基金项目
国家自然科学基金项目(U23A201007,U1603243)资助 （U23A201007,U1603243）
