Abstract:Thirty geothermal and surface water samples were collected from the twelve main geothermal fields in Tibet to analyze the occurrence and distribution of fluoride in Tibet. The results showed that concentration of fluoride varied between 0.34and 19.2mg/L, fluoride concentrations of all the geothermal water samples exceed 2.0mg/L. The fluoride's concentrations in the south were slightly higher than those in the north in the research area. The more abundant of fluoride, the hotter of the surface temperature. Generally, fluoride was more enriched in Na types' water (e.g. Cl-Na and Cl×SO4-Na types) than in Ca types' water (e.g. HCO3-Na×Ca and HCO3-Ca types). The main mechanisms of fluoride's enrichment in geothermal water may included: the mixture of deep geothermal fluid; the leaching of fluorite and silicate minerals containing fluoride. Comparison these two main mechanisms showed that 1st one was more important for forming extremely high fluoride’s concentration, the 2st one was more common in the research area. The enrichment mechanism of arsenic was similar as fluorine in the study area, and that was why the two elements had similar patterns in the spatial distributions. Strict environment regulations should be placed to manage arsenic and fluoride-contamination.
孙红丽, 马峰, 刘昭, 刘志明, 王贵玲, 男达瓦. 西藏高温地热显示区氟分布及富集特征[J]. 中国环境科学, 2015, 35(1): 251-259.
SUN Hong-Li, MA Feng, LIU Zhao, LIU Zhi-Ming, WANG Gui-Ling, NAN Da-Wa. The distribution and enrichment characteristics of fluoride in geothermal active area in Tibet. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(1): 251-259.