Use of chromium ferrocyanide membrane electrode in the potentiometric titration of ferrocyanide with metal ions

Abstract

Membranes based on the inorganic ion-exchanger chromium ferrocyanide have been prepared, which exhibit linear response to ferrocyanide over the concentration range 10 −1–10 −4 M. Although the electrode is not very specific for ferrocyanide, it can be used for potentiometric titration of metal ions with ferrocyanide ion or vice versa. Hg 2+, Th 6+, UO 2+ 2, Pb 2+, Cu 2+ and Zn 2+ have been determined in this way.