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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 7, Number 1
January 20, 1986 

Ferricyanide-Sensing Electrodes
Gwon-Shik Ihn
The Ferricyanide-sensing electrodes were prepared with Ag2S and Ag3Fe(CN)6. (mole ratio 3:1-7:1). The 5:1 (Ag2S:Ag3Fe(CN)6) composition is superior to others in terms of potentiometric response, rapidity of response and reproducibility. Testing was done over the concentration range 10-1 M∼10-6 M Fe(CN)63- at pH 6.8 with constant ionic strength. The concentration-potential curve was linear and coincided with the Nernstian slope (19.7 mV/decade). Interfering ions were I-, Br-, SCN- and Fe(CN)64- and the life time of this electrode was 3 weeks. This electrode could be used as the indicator electrode for measuring the ferricyanide and ferrocyanide.
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