The solid-phase extraction (SPE) technique has increasingly become popular in comparison with the more traditional liquid-liquid extraction methods because of its several major advantages such as: (i) simple to operate; (ii) high preconcentration factor; (iii) rapid phase separation;
and (iv) the ability to combine with different detection techniques. Various solid phases including Chelex 100, Amberlite XAD resins, synthetic polymers, polyurethane foam, and activated carbon have been used for the solid phase extraction of trace heavy metals in environmental
samples prior to their instrumental analysis. Among solid-phase adsorbents, SDS coated alumina are very useful for preconcentration and separation of metal complexes because of good physical properties such as their porosity, uniform pore size distribution, high surface area as chemical homogeneous non-ionic structures, and good adsorbent properties for great amounts of uncharged
compounds.