A study has been performed to determine the adsorption of Thorium (Th-232) onto three soil sample around Jimah Energy Venture coal-fired power plant located in Jimah, Port Dickson. Parameters that were set constant include soil dosage at 2.5g each; 50 ml of Th-232 solution. Parameters tested for optimum adsorption was based on initial concentration and pH of Th-232, and contact time. Highest percentage removal of Th-232 obtained for sample 1 and 3 at initial concentration of 25 ppm, pH 5 for 140 minutes are 99.69% and 99.98% respectively, while for sample 2, the highest percentage removal obtained at initial concentration of 25 ppm, pH 7 for 120 minutes are 99.92%. Freundlich and Langmuir isotherms were used to determine the adsorption isotherm for Th-232 adsorption. Based on this study, the result can be used as future reference regarding soil capability of adsorbing radionuclide. It is concluded that all soil sample has considerable ability of adsorbing Th-232 from entering the groundwater.
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