A CHELATING RESIN CONTAINING 4-(2-THIAZOLYLAZO)RESORCINOL AS THE FUNCTIONAL-GROUP - CHROMATOGRAPHIC APPLICATION TO THE PRECONCENTRATION ANDSEPARATION OF SOME TRACE-METAL IONS INCLUDING URANIUM

Chromatographic sorption behaviour of a chelating resin containing 4-( 2-thiazolylazo)resorcinol functional groups was investigated by a brea kthrough experiment, and its analytical applicability to the preconcen tration and separation of several metal ions including uranium(VI) was evaluated in the trace concentration range. On the mini column filled with 100 mg of the chelating resin, U(VI) and La(III) were preconcent rated with a concentration factor of 200 and then determined quantitat ively by neutron activation analysis. From uranium waste solutions con taining large amounts of Mg(II), Ca(II), Na(I) and carbonate ion, trac e amounts of U(VI) were quantitatively sorbed on the resin column in t he pH range 4.3 similar to 4.5, where formation of U(VI)-carbonate com plexes is negligible, and easily recovered by eluting with 10 ml of 0. 5 M HNO3. In addition, the chelating resin was successfully applied to the separation of Cu(II), Ni(II), Cd(II), Co(II), Zn(II), Pb(II), Al( III), Mn(II) and several rare earth metal ions from U(VI) by using 1 m M EDTA as an eluent. (C) 1997 Elsevier Science B.V.