Abstract: Effects of interaction of phosphatealuminum fluoride on the adsorption characteristics of fluoride in tea garden soil were studied via the imitated test. Adsorption equilibrium of fluoride in the tea garden soil was reached at nearly 25 min and the adsorption amount of fluoride in the soil increased tith the initial concentration of fluoride within test concentration under the control conditions. The equilibrium time was shortened and the adsorption amount decreased in the presence of phosphate. However, the equil ibrium time was prolonged and the adsorption amount decreased at different ratios fofluoride to aluminum. The effect of aluminum on the adsorption amount of fl uoride was more significant with increasing the proportiom of aluminum. Comparing with no phosphate, the adsorption amount of fluoride increased in the co-existence of aluminum and fluoride with different ratios at a low concentration of phosphate, and decreased in the co-existence of aluminum and fluoride with different ratios at a high concentration of phosphate. The two equations of Freundlich and Temkin can be used to describe the thermodynamics characteristics of the adsorption of the soil for fluoride in the tea garden soul whether phosphate and aluminum exist or not, however, the Langmuir equations can only be used to describe the adsorption characteristics of the adsorption of the soil for fluoride for a few cases.

Key words: tea garden soil, fluoride, interaction of phosphate aluminumfluoride, adsorption characteristics