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An Effect Of Cation On Leaching Of Fluoride From Saline Soils: A Kinetic Approach

S. Saxena, Anuj Kumar Garg, Ashu Rani, A. K. Gupta

Leaching kinetics of fluoride by loading AlF3 on undisturbed vertical saline soil columns has been investigated and compared using various kinetic models. Saline soils from Sambhar region of Rajasthan was selected to study leaching mechanism and effects of various parameters on leaching mechanism under atmospheric pressure. Linear relationship is established between the concentrations of leachable fluoride [F-]i and rate of leaching (LRobs). [F- ]i and LRobs are found to decrease with increase in Na+ and Ca+2 levels of extractant, while an increase has been observed with increase in temperature and OH- ions. Maximum [F-]i are resulted with addition of NH4OH in percolating water and minimum with addition of KOH. Total leachable F- was found to be unaffected by incubation time. First Order model are found to be best fit for representing fluoride leaching in the present experimental conditions.