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A B S T R A C TThe impact of common cations and anions on the adsorption of uranium on rice straw activated carbon has been examined. The presence of these ions in solution was found to inhibit the uptake of cadmium by chitin to different degrees. Presence of Fe ions depressed the uranium removal to 77 and 20% at 20 and 100 mg/l, respectively. Coexistence of some anions induced small positive effect on uranium adsorption percent like Cl -; 91.0%, CO 2À 3 ; 89.3%, HCO À 3 ; 88.8%, S 2 O 2À 3 ; 93.8%, and OH -; 91.6% compared to 84.2% uranium removal. Simultaneous presence of both uranium and thorium reduced uranium sorption from 100 to 35.9 mg/g. Data were good fitted by the Langmuir isotherm with correlation coefficient higher than 0.998. This means, the adsorption is monolayer chemical in nature on homogenous surface.