Chemical Speciation. Use of constants to model chemical form Thermodynamic and kinetic Determine property of radioelement based on speciation Chemical species in system Review Equilibrium constants Activity Use of constants in equation. Reaction Constants. For a reaction
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ZA = charge of species A
µ = molal ionic strength
RA = hydrated ionic radius in Å (from 3 to 11)
First estimation of activity
ij = specific ion interaction term
Experimental Data shows change in stability constant with ionic strength
Ion Specific Interaction Theory
Cm-Humate at pH 6
Must look at equation!
UO2 OH+ 8.5