A dynamic experimental study of the fluorine transport regularity in soil of Yuncheng Basin

Abstract：With the aid of soil column test models, the transport regularity of fluoride in different polluted fluoride soils of Yuncheng basin was studied. The curves of F- concentrations in different periods and at different positions were obtained in different soils under the condition of inputting fluoride contaminants continuously. Laboratory experiments reveal that the migration process of fluorine ion in soils is complex because of its active chemical properties. The pH values of the soil solution change from neutral to alkaline due to the release of OH－resulting from the adsorption in the course of the experiment. The breakthrough curve of the fluorine ion is asymmetric due to the adsorption and desorption, and the peak values of concentration decay gradually at different positions. The tail of the breakthrough curve is relatively long. The migration distance in vertical direction is comparatively short, and hence it is very difficult for the F- ion to migrate directly from soil to groundwater through eluviation. The results are consistent with the observation data.