济南市平阴氡地热水中氟的来源及赋存机理浅析

Primary Analysis on the Resource and Occurrence Mechanism of Fluorine Ion in Radon Geothermal Water in Pingyin of Jinan City

通过对3处不同热储类型的地热水水质分析结果的对比分析,试从热储岩性、矿化度、pH值、温度及地下水水化学类型等方面分析各因素对水中F^-溶解的影响机理,认为:热储岩性对地热水水质起决定作用,高热储温度、碱性环境是水中氟离子富集的有利条件;水中Ca^(2+)可与F^-产生不溶于水的沉淀,对水中氟离子的富集起限制作用;水中F^-与H_2SiO_3,Sr的含量一般存在共生关系。水中氟的活性和含量不能看作只与某种盐类或阴、阳离子发生单相关的孤立作用的结果,而要重视在水中各种盐类并存的混合体系中可能出现的元素或物质间的拮抗、协同及交互作用。

Through contrast and analysis on three different types ol geothermal water, Irom the aspects ol geother-mal reservoir lithology, TDS, pH, temperature and chemical types ol groundwater, it is concluded that geothermal reservoir lithology plays a decisive role to geothermal water quality. High reservoir temperature and alkaline environ-ment are favorable conditions lor the enrichment ol F in water. Ca2＋ and F can form precipitate which is insoluble in warer. It will limit the the enrichment ol F . F , HzSi〇3 and Sr usually appeared together in the same geothermal water. Activity and content ol F in water should not only be seen as the result ol some anion or cation associated with F as a single isolated action, the antagonistic, collaboration and interaction in the mixed system made by variety ol salts coexist should be paid more attention.