Amines selectivity series, metal extractions

Selective solid-phase extractors and preconcentrators of Hg(II) were synthesized and studied. These modified silica gel phases are based on chemical immobilization and physical adsorption of dithizone as well as chemical immobilization of dithiocarbamate on some amine-modified silica gel phases. The mmoFg values as the metal capacities of these modified silica gel phases were determined for a series of metal ions under the effect of pH of metal ions and the equilibration shaking times by the batch equilibrium technique. The modified silica gel phases were found to exhibit excellent affinity toward selective extraction of Hg(ll) in presence of other interfering metal ions. The potential applications of these modified silica gel phases as selective solid-phase extractors and preconcentrators for Hg(II) from natural water samples were also studied and the results indicated excellent extraction of Hg(II) with insignificant contributions by matrix effects. " " ... 

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