May 11 – 16, 2014
Casino Conference Centre
Europe/Prague timezone

Spectrophotometric and TRLFS speciation study of UO2(2+) - ChO4(2-) – H2O (Ch = S, Se) system

May 13, 2014, 2:45 PM
15m
Mirror Hall (Casino Conference Centre)

Mirror Hall

Casino Conference Centre

Reitenbergerova 4/95, Mari&#225;nsk&#233; L&#225;zn&#283;, Czech Republic <font color=white>
Verbal Chemistry of Actinide and Trans-actinide Elements Chemistry of Actinide and Trans-actinide Elements 3

Speaker

Mr Jakub Visnak (Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague)

Description

This experimental study seeks for stability constants $\beta_m°$, absorption $Z_m(\lambda)$ and fluorescence $Z_m(\lambda)$ spectra (including fluorescence lifetimes $\tau_m$) for the individual species of the general formula $[UO_2(ChO_4)_n]^{2-2n}$ (n $\in$ {0; 1; 2; 3}), specific ion interaction theory parameters $\epsilon(i,j)$ between uran-containing species and the most dominantly present ions ($Na^+, ClO_4^-, ChO_4^{2-}, HChO_4^-$) and their temperature dependence (for which the $\Delta H°$ for all present complex species is derived). Our study was done by preparing of several series of solutions (solutions differing by total sulfate/selenate concentration within the series and by total uranium concentration, pH and ionic strength between different series), measurement of the spectra (UV-VIS abs., TRLFS) and subsequent multilinear analysis (based on Singular Value Decomposition, Parallel Factor Analysis, …). The obtained results are compared with the previously measured data (our TRLFS spectra for uranyl-selenate complex species were, however, in the time of the abstract submission novel) and quantum chemical (ab initio and DFT) study, which part is presented on RadChem 2014 as well.

Primary authors

Mr Jakub Kuba (Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague) Mr Jakub Visnak (Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague)

Presentation materials

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