SYNTHESIS AND EFFICIENCY OF AN EPOXY-UREA CHELATING RESIN FOR PRECONCENTRATING AND SEPARATING TRACE BI, IN, SN, ZR, V AND TI FROM SOLUTION SAMPLES

A new epoxy-urea chelating resin was synthesized from epoxy resin and used for the preconcentration and separation of trace Bi(III), In(III) , Sn(IV), Zr(IV), V(V) and Ti(IV) ions from solution samples. The anal yzed ions can be enriched at pH 5 at a flow rate of 1-4 ml/min, and ca n be also desorbed with 10 mL of 2 M HCl +0.1g NH4F solution from the resin column, with recoveries over 97%. The chelating resin reused 6 t imes can still adsorb quantitatively the Bi, In, Sn, Zr, V and Ti ions , and eighty to thousand-fold excesses of Ca(II), Mg(II), Cu(II), Zn(I I), Al(III), Sb(III), Ni(II), Mn(II) and Fe(III) cause little interfer ence with the enrichment and determination of these ions. The RSDs of the proposed method for the determination of 500-50 ng/ml Bi, In and S n, 50-5.0 ng/ml Zr, V and Ti were in the range of 0.4 similar to 4.0%, the enrichment factor of the resin for the ions is in the range of 10 -100. The recoveries of added standard in waste water are between 96% and 100%, and the concentration of each ion in alloy steel sample dete rmined by the method is in good agreement with the reference value ana lyzed by a steel plant with average error<2.8%.