CHELATE-FORMING RESIN PREPARED BY MODIFICATION OF ANION-EXCHANGE RESIN

A chelate-forming resin was prepared from a strongly basic anion-excha nge resin, VIONIT AT 1 (Cl-), by treatment with Pyrocatechol-Violet (P V). PV resin mas stable in 0.1 1-1M HCl and HNO3 respectively, and was used in retention of Bi(III), Cu(II), Co(II), Ni(II), Zn(II) ions. Th e sorbed Bi(III) can be eluted with 10% solution of thioureea in 0.1 M HNO3, and determined spectrophotometrically in the effluent. The othe r elements sorbed in PV resin were eluted with 0.1 M HCl and determine d by complexanometric titration.