<正>The new chelate resins

abbreviated as PNBMZs and PBBMZs based on epoxide polymer

were synthesized by polycondensation of N

N-diglycidyl-4-glycidyloxyaniline or l

4-bis（2

3-epoxypropyl）benzene with the primary amine group of l

3-bis（benzimidazol-2yl）propylamine （BBPAH）. The ion exchangers contain 2.71-3.23 mmol of the ligand contents per gram of the resin. Batch extraction capacities were determined for the metal chloride salts in buffer solutions in the pH range from -1 to 6.0. The chelate resins were very selective for Cu2+

Zn2+

Cd2+ in the presence of other divalent transition metal ions. The maximum uptake capacities of PNBMZ （synthetic molar ratio = 1:1.5） under non-competitive condition were found to be 0.94 mmol/g for Cu2+ at pH = 2

1.3 mmol/g for Cd2+ at pH = 1 and 1.75 mmol/g for Zn2+ at pH = -1 respectively. While in the case of PBBMZ

it was 1.39 mmol/g for Cd2+ at pH = 1. The metal-uptake behaviors for both of them showed strong pH dependence

and their extraction capacities increase with decreasing pH. The uptake of Cu2+ by the resin PNBMZs at pH = 1 was found to be rather fast with t1/2 =18 min. Metal-uptake experiments under competitive conditions also confirm that the chelate resins have a high selectivity for Cu2+

Zn2+

Cd2+ and the contrary pH dependence.