The study of the speciation of uranyl–sulphate complexes by UV–Vis absorption spectra decomposition View Full Text


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Article Info

DATE

2010-08-19

AUTHORS

Dušan Vopálka, Karel Štamberg, Alois Motl, Barbora Drtinová

ABSTRACT

Uranyl–sulphate complexes are the predominant U(VI) species present in acid solutions resulting either from underground uranium ore leaching or from the remediation of leaching sites. Thus, the study of U(VI) speciation in these solutions is of practical significance. The spectra of UO2(NO3)2 + Na2SO4 solutions of different ΦS = [SO42−]/[U(VI)] ratio at pH = 2 were recorded for this purpose. As the presence of uranyl-nitrate complexes should be expected under these experimental conditions, the spectra of UO2(NO3)2 + NaNO3 solutions with different ΦN = [NO3−]/[U(VI)] ratio at pH = 2 were also measured. The effects of ΦS and ΦN ratios value were most pronounced in wavelength interval 380–500 nm. Therefore, these parts of experimental overall spectra were used for deconvolution into the spectra of individual species by the method proposed. It enabled to calculate stability constants of anticipated species at zero ionic strength. The Specific Ion Interaction Theory (SIT) was used for this purpose. Stability constants of UO2SO4, UO2(SO4)22−, UO2NO3+ and UO2(NO3)2 coincided well with published data, but those for UO2(SO4)34− and UO2(NO3)3− were significantly lower. More... »

PAGES

681-686

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10967-010-0764-5

DOI

http://dx.doi.org/10.1007/s10967-010-0764-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037102998


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