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Potentiometric Detection of Oxygen Based on the Mixed Potential of Zinc
Author(s) -
Vallières Cécile,
Gray Joshua,
Poncin Souhila,
Matlosz Michael
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199803)10:3<191::aid-elan191>3.0.co;2-w
Subject(s) - potentiometric titration , potentiometric sensor , amperometry , zinc , electrolyte , chemistry , oxygen , inorganic chemistry , oxygen sensor , electrode , analytical chemistry (journal) , reference electrode , electrochemistry , chromatography , organic chemistry
A new potentiometric oxygen sensor is proposed, based on the mixed potential of zinc in a chloride electrolyte. Variations in the sensor potential with oxygen concentration are the direct result of changes in the corrosion rate of the zinc electrode due to diffusion‐limited reduction of oxygen at its surface. For static concentration measurements, the performance of the new (potentiometric) sensor is essentially equivalent to that of a traditional (amperometric) Clark sensor. For transient measurements, however, the response of the potentiometric sensor can be considerably faster than the analogous amperometric sensor, due to the sensitivity of the potentiometric method to logarithmic (rather than linear) variations in oxygen concentration.