Thermodynamic properties of ternary aqueous electrolyte solutions

Luminita Grigore, Aurelia Meghea, Ovidiu Grigore, Rodrigo Martins

Research output: Contribution to journalArticlepeer-review


In previous papers the mean excess chemical potential, μ1(E), in ternary systems of the type I sulphate + II sulphate + H2O, at 25°C was determined. Results obtained for systems with CuSO4(I), and ZnSO4(I) respectively, pointed out an obvious disparity between their behaviours. They show the existence of some important association phenomena partially accounting for the substantial deviations from ideal behaviour. The ternary sulphate systems (CuSO4 + Me(I,II)SO4 + H2O; ZnSO4 + Me(I,II)SO4 + H2O) studied were characterized against the binaries of the same ionic strength, experimental data being obtained using both e.m.f. and spectrophotometric methods. Deviations from the ideal behaviour were discussed in terms of thermodynamic excess functions and association constants. A comparative study between the results obtained with the two above mentioned methods is presented.

Original languageEnglish
Pages (from-to)409-428
Number of pages20
JournalPhysics and Chemistry of Liquids
Issue number4
Publication statusPublished - 1999


  • Association constants
  • E.m.f. method
  • Spectrophotometry
  • Ternary aqueous systems


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