Collect. Czech. Chem. Commun. 1995, 60, 76-84

Preconcentration and Determination of Cadmium and Lead by Ion-Pair Solid Phase Extraction on Silica Gel Followed by Flame Atomic Absorption Spectrometry

Petr Rychlovský, Jiří Bílý and Eva Bazakasová

Department of Analytical Chemistry, Charles University, 128 43 Prague 2, Czech Republic


The ion-pair formation between the metal complex with 4-(4'-nitrophenylazo)-1-naphthol and cetyltrimethylammonium bromide and its sorption on silica gel form the basis for preconcentration of cadmium and lead, which are subsequently determined on-line by flame AAS. The method was applied to the quantitation of cadmium and lead in potable and surface waters, with limits of determination (10s) of 0.5 and 2 μg l-1, respectively.