Abstract

After a short presentation of the relevant thermodynamic theory for solid solutions, the equations used for the computation of mass transfers are presented as well as methods for their solution. Two simple test programs, solusol and solumix, were constructed for the calculation of equilibria involving non-ideal solid solutions, the last taking exsolution processes into account. In another minor program, solidsol, the formation of ideal solid solutions is considered, as well as the simultaneous speciation in the aqueous phase. Based on estimated mass transfers, the experimental evidence in favour of the interpretation of some adsorption phenomena as being due to the formation of “surface solutions” is presented and discussed.

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