caa a22 4500 378872273 CHVBK 20180305123412.0 cr unu---uuuuu 161128e20031101xx s 000 0 eng 10.1524/ract.91.11.623.23466 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.11.623.23466 Thermodynamic data for modelling actinide speciation in environmental waters [Elektronische Daten] [Pierre Vitorge, Hélène Capdevila] An operational TDB is generated from the validated NEA-TDB by adding formation constants (eventually those of chemical analogues, and typically logβ°Pu(CO₃)₅⁶⁻ = 35.6, 4 pH1/2 = -37.5 for Np(VII) hydrolysis, possible maximum values for formation constants of several Pu(CO3)i(OH)j(4-2i-j)+ complexes, and solubility products for compounds of tentative stoichiometries MO2+x for M = U, Np, Pu and Am), and by estimating new numerical values (typically E°(AmO₂²⁺/AmO₂⁺) = 1.50, E°(AmO₂⁺/Am³⁺) = 1.48, E°(Am⁴⁺/Am³⁺)=2.49V/SHE). Beside checking the consistency of published experimental data, and performing sensitivity analysis of their interpretation as for any critical review work, activity coefficients and pH calibration also appeared to be critical. Dramatic decrease in aqueous Np(V) solubility is expected, when it is coprecipitated at trace concentration: solubility controlled by the hypothetical ideal solid solution Na2x-1NpO2(CO3)x(s) (2≥ x ≥ 1), is calculated by solving the set of two thermodynamic equations [Na+]2x-1 [NpO2+][CO32-]x = Ksx, together with (2x-1)[NpO2+]/[Na+] = D, where Ksx = K2-xs1 (16Ks2/27)x-1(2-1/x)2x-1/x, Ks1 and Ks2 are the solubility products of the end-member compounds, and D = 27Ks12/(16Ks2) is the equilibrium constant for Ionic Exchange NpO2+/Na+. Conversely, equilibrium constant, D, of any ionic exchange equilibrium can be interpreted as ratio of solubility products of end-member compounds (eventually surface compounds). © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Vitorge Pierre aut Capdevila Hélène aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/11/2003(2003-11-01), 623-632 0033-8230 91:11/2003<623 2003 91 ract https://doi.org/10.1524/ract.91.11.623.23466 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.11.623.23466 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vitorge Pierre aut NATIONALLICENCE 700 1- Capdevila Hélène 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), 623-632 0033-8230 91:11/2003<623 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter