3.8. Extraction and determination of Pb2+, Cu2+, Zn2+ and Cd2+ ions in
mixtures
In order to investigate the extraction of Pb2+, Cu2+, Zn2+ and Cd2+
ions from water solutions containing diverse metal ions, an aliquot
of aqueous solution (50 mL) containing 100 lg of Pb2+, Cu2+, Zn2+
and Cd2+ ions and various amounts of other cations was taken and
the recommended procedure was followed, and the results are
shown in Table 2. As is obvious from Table 2, Pb2+, Cu2+, Zn2+ and
Cd2+ ions in all mixtures are retained completely by the
functionalized SBA-15.