caa a22 4500 477139094 CHVBK 20180405111727.0 cr unu---uuuuu 170330e19970701xx s 000 0 eng 10.1007/BF02767621 doi (NATIONALLICENCE)springer-10.1007/BF02767621 Measurement and thermodynamic modeling of Np(V) solubility in aqueous K2CO3 solutions to high concentrations [Elektronische Daten] [Craig Novak, Ilham Mahamid, Kevin Becraft, Scott Carpenter, Nadia Hakem, Traudel Prussin] The solubility of Np(V) solids was studied in 0.01 to 6.38 mol-Kg-1 2CO3 solutions. Two series of experiments were conducted from undersaturation using NpO2OH(s) or KNpO2CO3(s) as the starting solid. The Np(V) solid phases observed at steady state are KNpO2CO3(s) and K3NpO2(CO3)2(s). The activity coefficient formalism of Pitzer was used to obtain a thermodynamic interpretation of these data, including the solubility constants: $$\begin{gathered} KNpO_2 CO_3 (s) \rightleftharpoons K^ + + NpO_2^ + + CO_3^{2 - } log K_s = - 13.6 \pm 0.1(2\sigma ) \hfill \\ K_3 NpO_2 (CO_3 )_2 (s) \rightleftharpoons 3K^ + + NpO_2^ + + 2CO_3^{2 - } log K_s = - 15.9 \pm 0.1(2\sigma ) \hfill \\ \end{gathered} $$ To model these data, we propose values for several binary and ternary ion interaction parameters among the carbonate ion, potassium ion, and the neptunyl triscarbonato ion. With these new parameters, the thermodynamic data base for Np(V) solubility in concentrated aqueous solutions has been extended to the NaK-C1-C1O4-CO3-H-OH-H2O system. Plenum Publishing Corporation, 1997 Neptunium (V) nationallicence thermodynamics nationallicence solubility nationallicence concentrated electrolytes nationallicence Pitzer activity coefficient expressions nationallicence Novak Craig Sandia National Laboratories, P.O. Box 5800, 87185-1320, Albuquerque, New Mexico aut Mahamid Ilham Lawrence Berkeley National Laboratory, Berkeley, California aut Becraft Kevin Lawrence Berkeley National Laboratory, Berkeley, California aut Carpenter Scott Lawrence Berkeley National Laboratory, Berkeley, California aut Hakem Nadia Lawrence Berkeley National Laboratory, Berkeley, California aut Prussin Traudel Lawrence Berkeley National Laboratory, Berkeley, California aut Journal of Solution Chemistry Springer US 26/7(1997-07-01), 681-697 0095-9782 26:7<681 1997 26 10953 https://doi.org/10.1007/BF02767621 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02767621 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Novak Craig Sandia National Laboratories, P.O. Box 5800, 87185-1320, Albuquerque, New Mexico aut NATIONALLICENCE 700 1- Mahamid Ilham Lawrence Berkeley National Laboratory, Berkeley, California aut NATIONALLICENCE 700 1- Becraft Kevin Lawrence Berkeley National Laboratory, Berkeley, California aut NATIONALLICENCE 700 1- Carpenter Scott Lawrence Berkeley National Laboratory, Berkeley, California aut NATIONALLICENCE 700 1- Hakem Nadia Lawrence Berkeley National Laboratory, Berkeley, California aut NATIONALLICENCE 700 1- Prussin Traudel Lawrence Berkeley National Laboratory, Berkeley, California aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US 26/7(1997-07-01), 681-697 0095-9782 26:7<681 1997 26 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer