抄録
It was found that the adsorption amount of zinc ions from Watts type nickel plating solution on the weakly basic anion exchange resin (Sumichelate CR-2) increased by about 10 times as compared to that on strongly basic anion exchange resins. Therefore, ion exchange equilibrium constants of Sumichelate CR-2 for ZnCl42- and HZnCl4- were measured in the mixed solution of HCl and LiCl containing 10mol/l Cl-. The constants obtained for ZnCl42- and HZnCl4- were 1.5×105 and 3.1×104 respectively, and these values were 3 times as much as those of the strongly basic anion exchange resin (Dowex 1-x8) for the same anions. No different ratio of ZnCl42- to HZnCl4- was obtained, however, in bath case of Sumichelate CR-2 and Dowex 1-x8.
