Collect. Czech. Chem. Commun. 1993, 58, 1813-1820

Preconcentration of Uranium(VI) on Modified and Unmodified Amberlite XAD 4 Sorbent

Jan Vácha and Lumír Sommer

Department of Analytical Chemistry, Masaryk University, 611 37 Brno, Czech Republic


The sorption of uranyl ions on columns with the macrophorus hydrophobic sorbent Amberlite XAD 4 modified with 1-(2-pyridylazo)-2-naphthol and sodium diethyldithiocarbamate was examined. Following elution of the uranyl ion with HNO3 (2 - 4 mol l-1) or of the diethyldithiocarbamate UO22+-chelate with a methanolic solution of HCl (0.1 mol l-1), uranium was determined spectrophotometrically with 4-(2-pyridylazo)resorcinol or with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol. The preconcentration of uranium on Amberlite XAD 4 type sorbents is convenient for its spectrophotometric determination in waters.