The inequivalence of apparent polarographic and potentiometric stability constants for cadmium(II) bromide and iodide systems

A. M. Bond, G. Hefter

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)


Investigations of the "classical" cadmium(II) bromide and iodide complex ion systems show conclusively that in the presence of moderately strong anion-induced adsorption, apparent polarographic stability constants are larger than those determined by other methods such as potentiometry. Such systems can exhibit seemingly normal d.c. polarographic behaviour, but adsorption is readily detected by a.c. methods. The authors therefore strongly recommend that in systems in which adsorption is detected, polarography should not be used to determine stability constants. Theoretical approaches to explain the observed phenomena are discussed and it is concluded that apparently differing approaches that have appeared in the literature are in fact equivalent.

Original languageEnglish
Pages (from-to)203-216
Number of pages14
JournalJournal of Electroanalytical Chemistry and Interfacial Electrochemistry
Issue number2
Publication statusPublished - 10 Mar 1976
Externally publishedYes

Cite this