Abstract:

The existing state and extracting method of fluorine in bottom mud are discussed. Based on the experimental analysis of different fluoride forms in the bottom mud of Yangshapao reservoir, the distribution of various fluoride forms in the bottom mud is clear. The content of residual state fluorine is much more than that of water soluble fluorine, more than that of the organic-bound state fluorine, more than that of iron and manganese bound state fluorine, and more than that of exchangeable state fluorine. The fluorine content of different forms in the bottom mud is in logarithmic distribution character. The content of water soluble fluorine is 26.77-112.39 mg/kg，which accounts 2.699%-19.114% of the total fluorine content. The content of the total fluorine in the bottom mud, source of fluorine, the climate factor, the regional physical and chemical environment, and several time dry-out of the lake are considered to be the main factors of the high content of water soluble fluorine depositing into the bottom mud.

Key words: bottom mud, fluorine, existing forms, influence factors