Thermodynamic studies of weak aqueous sulfate solutions in solvent extraction systems

Ruey‐Shin ‐S Juang*, Jenn‐Yih ‐Y Su

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

8 Scopus citations


The molalities and activity coefficients of various chemical species in the 0.5 M (H,Na,Me)SO4 aqueous solutions (Me = Cu, Co or Zn) were calculated by the Bromley and the simplified Pitzer methods for strong electrolyte solutions. The validity of the conventional constant ionic medium method applied to these extraction systems was studied. The thermodynamic constants of these trace metal extractions with di(2‐ethylhexyl)phosphoric acid (D2EHPA) were also evaluated, based on simple experiments and the calculated thermodynamic results.

Original languageEnglish
Pages (from-to)237-242
Number of pages6
JournalJournal of Chemical Technology and Biotechnology
Issue number3
StatePublished - 1992
Externally publishedYes


  • constant ionic medium method
  • di(2‐ethylhexyl)phosphoric acid
  • divalent metal extraction
  • thermodynamic studies


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