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An analysis of 17 UV–Vis absorption spectra is presented, collected in a region of the pH/lg(acetate) diagram where the UO 2 CH 3 COO + species prevails. The study was conducted (a) to test a previously determined single component of the UO 2 CH 3 COO + species, (b) to assess the impact of (UO 2 ) 2 (OH) 2 2+ hydrolysis species into numerical peak deconvolution and (c) to study statistical properties of peak deconvolution procedures as a basis for measurement uncertainty assessment. Comparative speciation was performed for a two-species and three-species model, which resulted in different values of U(VI)-acetato formation quotients. The numerical analysis corroborated a detectability of (UO 2 ) 2 (OH) 2 2+ at relative amounts >1%. Lower relative contributions remain ambiguous due to the large Pearson correlation of U(VI) UV–Vis single component spectra. The results of the study show the quantitative deconvolution of U(VI) spectra into single components of UO 2 2+ , UO 2 (CH 3 COO) + and (UO 2 ) 2 (OH) 2 2+ species. Theoretical U(VI) concentrations are reproduced within a few percent. |
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