Fluorine mobilization from rocks under the action of organic acids

Resumo

This paper presents the results of experimental study of fluorine leaching from rocks of various basicity by distilled water and multicomponent organic acid solution, in which the frequency distribution of dissociation constants of carboxyl groups correspond to that of natural soil solutions. It is shown that organic acids significantly enhance the intensity of fluorine leaching from rocks as compared to distilled water. A positive correlation was established between fluorine and magnesium extracted from different rocks by organic acids (r = 0.92). The correlation between fluorine and other main petrogenic elements is absent. Intensity of fluorine mobilization from rocks under the action of organic acids increases with the growth of basicity of the rocks with decreasing their chemical stability in the following sequence: meimechite > basaltic andesite > albitized rhyodacite > alkaline agpaitic granite.