caa a22 4500 378872214 CHVBK 20180305123411.0 cr unu---uuuuu 161128e20031101xx s 000 0 eng 10.1524/ract.91.11.665.23472 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.11.665.23472 Dimerization of Np(V) and media effects in concentrated solutions [Elektronische Daten] [A. C. Gregoire-Kappenstein, Ph. Moisy, Gerard Cote, P. Blanc] Highly concentrated (up to 3.56mol L-1) binary solutions of NpO2NO3 were prepared to investigate the self-association of Np(V). By using visible/NIR absorption spectrophotometry and chemometric techniques, Np(V) was shown to be only monomeric below 0.2mol L-1, to exist under its monomeric and dimeric forms between 0.2 and 2mol L-1, to begin to form self-associates of higher degrees above 2mol L-1. In the range 0.2mol L-1 < CNp(V)<2mol L-1, the neptunium distribution between the free NpO2+ and dimeric (NpO2)22+ forms was determined by Raman spectroscopy. The simple solution concept was used to establish the activity function for the reaction of dimerization. Such a water activity function can be used to calculate the apparent dimer formation constant for any solution of known composition and water activity, provided that this solution is simple. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Gregoire-Kappenstein A. C. aut Moisy Ph aut Cote Gerard aut Blanc P. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/11/2003(2003-11-01), 665-672 0033-8230 91:11/2003<665 2003 91 ract https://doi.org/10.1524/ract.91.11.665.23472 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.11.665.23472 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gregoire-Kappenstein A. C. aut NATIONALLICENCE 700 1- Moisy Ph aut NATIONALLICENCE 700 1- Cote Gerard aut NATIONALLICENCE 700 1- Blanc P. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/11/2003(2003-11-01), 665-672 0033-8230 91:11/2003<665 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter