Study of the speciation in the system UO22+–SO42––H2O by means of the UV-VIS spectrophotometry

Abstract

This work estimates speciation characteristics of the UO22+–SO42––H2O system by means of the analysis of UV-VIS absorption spectra of series of aqueous solutions of uranium(VI) (total molar concentration 0.05 mol·dm–3), sodium sulfate (varying concentration from 0 to 1.3 mol·dm–3), perchloric acid (to adjust pH = 2) and sodium perchlorate (to adjust ionic strength I in each series (between different series I varied from 0.7 mol·Kg–1 to 4.0 mol·Kg–1)). log β° for several complexes were estimated by SVD-based mathematical analysis of spectra. The existence of isomers of uranyl(VI)-sulfate complexes is discussed.