PHOSPHATE ADSORPTION CHARACTERISTICS OF SOME MALAYSIAN SOILS: CONFORMITY WITH ADSORPTIOMNC IDELS

ABDUL RASHID AHMAD

Three adsorpation models, the Langmuir Freundlich and Tempkin, were used to the describe the phosphate adsorpation chareacteristics of some Malaysian soils. The Langmuir model was found to conform very well with the adsorpation date only for soils having very high adsorption capacity. The Freundlich model was found to conform very well with the adsorption data for soils having intermediate adsorption capacities. The Temkin model was found to improve the Langmuir model at a low range of equilibrium concentration and is thus useful for soils having high adsorption capacities. The parameters which summarie the adsorption process are the maximum buffer capacity (MBC) of the Langmuir model, the adsorption constant (a) of the Freundlich model and the contanst (q) of the Temkin model. Their use should be limited to the P concentration range within which the models conform with the adsorption data. By using parameters as characterizing parameters it was found that some Malaysian soil may be classified according to their adsorption capacity.

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