摘要
研究干旱区地下水氟的分布和形成对当地供水安全具有重要意义。文中以清水河平原上游承压地下水为研究对象,运用统计分析和同位素分析等方法,揭示氟的空间演化和水文地球化学过程。结果表明:沿地下水流向,氟含量呈低→高→低变化。云母是地下水中氟的物源,氟含量和p H、HCO3-、[Na+]/[Ca2+]和B显著相关。补给区和强径流区的氟来自云母的水解,弱径流区的解吸-吸附作用和潜水越流成为氟富集的有利条件,滞流区氟含量受到了石膏溶解的影响而降低。
Understanding the distribution and formation of groundwater fluoride is important for water supply safety in arid area. The statistics and isotopic analysis method was used to reveal the spatial evolution and hydrogeochemical process of fluoride in confined groundwater. The results showed that F-concentration firstly increased and then declined along flow path and had a significant correlation with pH,HCO3^-,[Na^＋]/[Ca^2＋]ratio and B. Micas was the principal mineral of fluoride occurring in groundwater. In the recharge and fast run- off area,the source for F-was the hydrolysis of micas,in the slow run- off area desorption and phreatic water leakage favored the enrichment and in the stagnation area lower F-concentration was affected by the dissolution of gypsum.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第12期170-176,共7页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(基于山区地下水分布非均一性特征的水文地质编图研究
41240021)
中国地质调查局项目(宁夏中南部严重缺水地区地下水勘查与供水安全示范
1212011013002)资助
关键词
地下水
氟
空间变异
形成机理
清水河平原
groundwater
fluoride
spatial variation
genesis
Qingshui river basin
