By Robert J. Silva
This can be the second one quantity in a sequence of severe studies of the chemical thermodynamic facts of these parts of specific significance within the security review modeling of high-level radioactive waste garage and disposal amenities. the target of those studies is to supply a suite of trustworthy thermodynamic information that may be used to explain the behaviour of those components lower than stipulations correct for radioactive waste disposal platforms and the geochemical environments. the current quantity is a evaluate of experimental info suggested within the literature for americium. On a couple of events, the place no facts existed, comparisons and estimates have been made in response to experimental info on analog lanthanide components. the elemental philosophy used to be to advance a minimal set of strong stages and resolution species of americium that will healthy all experimental information being reviewed
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Additional resources for Chemical Thermodynamics of Americium
2). 48) Β where t h e stoichiometric coefficients u are positive for products, and negative for reactants. T h e reaction parameters considered in the N E A - T D B system include: B l o g K° A G^ 10 r Δ 5^ A C° Γ R M R the the the the the equilibrium constant of the reaction, logarithmic molar Gibbs energy of reaction (kJ · m o l ) molar enthalpy of reaction (kJ · m o l ) molar entropy of reaction (J · K · mol ) molar heat capacity of reaction (J · K · mol ) - 1 - 1 - 1 - 1 - 1 - 1 T h e t e m p e r a t u r e functions of these data, if available, are stored in the record REC O E F S , according to Eq.
The fact t h a t only changes in thermodynamic parameters, but not their absolute values, can be determined experimentally, makes it important to have a well-defined standard state t h a t forms a base line to which the effect of variations can be referred. The IUPAC [82LAF] definition of the standard state has been adopted in the NEAT D B project. 1 M P a (1 bar), has therefore also been adopted, cf. 2. The application of the standard state principle to pure substances and mixtures is summarised below.
000 Value calculated internally with the Gibbs-Helmholtz equation, AfG^ = AfH^ TA S° . 2). 3. 3. Only reaction data are selected for this compound, cf. 2. 2: Selected thermodynamic data for reactions involving americium compounds and complexes. All ionic species listed in this table are aqueous species. 1 MPa and, for aqueous species, infinite dilution (1 = 0). The uncer tainties listed below each value represent total uncertainties and correspond in principle to the statistically defined 95% confidence interval.
Chemical Thermodynamics of Americium by Robert J. Silva