KINETICS OF PHOSPHATE ADSORPTION BY SANDY AND CLAYEY SOILS

概要

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The kinetics of phosphate (P) adsorption for Gray Lowland soil (Fujimi sandy soil) and Yellow soil (Takashigahara clayey soil) was determined by equilibrating the soils with various concentrations of P solutions. The soil/solution ratio was approximately 7 : 2, which was equivalent to the field capacity. The kinetic equation of P adsorption was derived by regression analysis of the experimental data. The empirical equation, 〓S/〓t=kC^mS^n, was inadequate to describe the kinetics of P adsorption ,where S is the amount of P adsorbed per unit mass f soil, C is the concentration of P in the soil solution, t is time, and k, m, and n are constants. Kuo's equation, S = a' Cot^<b'>, was unsuitable for the prediction of the P adsorption kinetics under field moist conditions especially at a low initial P concentration, where Co is the initial P concentration, a' and b' are constants. The rate equation which best fitted the experimental data was S = at^bC^d, where a, b, and d are constants. The correlation coefficients for this equation were larger than 0.99.
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