Abstract
The preconcentration of some divalent metal ions by complexation with carboxyphenylporphyrin (TCPP) and retention on conventional anion-exchange resins and a non-ionic sorbent was examined. Two different procedures--ligand in solution or immobilised on the solid sorbents--were evaluated as a function of pH. The selectivity order for metal ions on the TCPP-loaded resin Amberlite IRA-904 was established as: Pb(II)>Ni(II)>Cu(II)>Cd(II)>Mg(II).
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