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Sorption of arnmine complexes of Ni+ 2 , CU+ 2 , Zn+: and Cd+ 3 On hydrous Tin dioxide has been studied at different pH values. It has been found that qa and Kd values attain a maximum with increasing pH, beyond which a faU is observed. The selectivity quotients of the exchanger material towards competing pairs (Cu+2-Zn+ 2 , Cu+1-Cd+ 3 , CU+ LNi+2 ) of complex ions have been measured as a function of the concentration of the external solution. The selectivity of the exchanger material towards the preferred ion decreased with increase in the concentration of the competing ions in the external solution. The selectivity and the sorption values (qa) follow the same order.

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