Hydrolysis of Np(IV) and Pu(IV) and their complexation by aqueous Si(OH)4
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| 024 | 7 | 0 | |a 10.1524/ract.92.12.869.55104 |2 doi |
| 035 | |a (NATIONALLICENCE)gruyter-10.1524/ract.92.12.869.55104 | ||
| 245 | 0 | 0 | |a Hydrolysis of Np(IV) and Pu(IV) and their complexation by aqueous Si(OH)4 |h [Elektronische Daten] |c [A. B. Yusov, A. M. Fedosseev, C. H. Delegard] |
| 520 | 3 | |a The hydrolysis and interaction of Np(IV) and Pu(IV) with orthosilicic acid, Si(OH)4, were studied in 0.1-1.0M ionic strength aqueous solutions. Spectrophotometry was used to study these reactions at about 10-4M Np(IV) and Pu(IV) concentrations. The first hydrolysis constants, Khydr, agree with the majority of earlier spectrophotometric and potentiometric data. The absorption spectra of NpOH3+ and PuOH3+ were obtained by spectral deconvolution. Reasons to explain the overestimation of Khydr obtained by other methods [by extraction of trace amounts of Np(IV) and Pu(IV) and by solubility] are discussed. Formation of the complexes NpOSi(OH)33+ and PuOSi(OH)33+ is demonstrated in the presence of 0.005-0.016M Si(OH)4 in the p[H+] range 1.0-2.2 and 0.3-1.4, respectively. Measured values of equilibrium constants of the reaction M4+ + Si(OH)4 ↔ MOSi(OH)33+ + H+ at ionic strength I=1.0 are lg K1 = 0.41±0.02 and 1.04±0.04, respectively, for Np(IV) and Pu(IV). The stability constants of the NpOSi(OH)33+ and PuOSi(OH)33+ complexes, recalculated to zero ionic strength, are lg β10 = 11.2 and 11.8, respectively. The correlation between Khydr and K1, as observed for all earlier studied metal ions, also occurs for both Np(IV) and Pu(IV). | |
| 540 | |a © 2004 Oldenbourg Wissenschaftsverlag GmbH | ||
| 690 | 7 | |a Laboratory techniques, experiments |2 nationallicence | |
| 690 | 7 | |a Analytical chemistry |2 nationallicence | |
| 690 | 7 | |a Inorganic chemistry |2 nationallicence | |
| 700 | 1 | |a Yusov |D A. B. |4 aut | |
| 700 | 1 | |a Fedosseev |D A. M. |4 aut | |
| 700 | 1 | |a Delegard |D C. H. |4 aut | |
| 773 | 0 | |t Radiochimica Acta/International journal for chemical aspects of nuclear science and technology |d Oldenbourg Wissenschaftsverlag GmbH |g 92/12/2004(2004-12-01), 869-881 |x 0033-8230 |q 92:12/2004<869 |1 2004 |2 92 |o ract | |
| 856 | 4 | 0 | |u https://doi.org/10.1524/ract.92.12.869.55104 |q text/html |z Onlinezugriff via DOI |
| 908 | |D 1 |a research article |2 jats | ||
| 950 | |B NATIONALLICENCE |P 856 |E 40 |u https://doi.org/10.1524/ract.92.12.869.55104 |q text/html |z Onlinezugriff via DOI | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Yusov |D A. B. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Fedosseev |D A. M. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Delegard |D C. H. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 773 |E 0- |t Radiochimica Acta/International journal for chemical aspects of nuclear science and technology |d Oldenbourg Wissenschaftsverlag GmbH |g 92/12/2004(2004-12-01), 869-881 |x 0033-8230 |q 92:12/2004<869 |1 2004 |2 92 |o ract | ||
| 900 | 7 | |b CC0 |u http://creativecommons.org/publicdomain/zero/1.0 |2 nationallicence | |
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| 949 | |B NATIONALLICENCE |F NATIONALLICENCE |b NL-gruyter | ||