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Iridium oxide pH microelectrode

✍ Scribed by Paulus VanHoudt; Zbigniew Lewandowski; Brenda Little

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 811 KB
Volume: 40
Category: Article
ISSN: 0006-3592
DOI: 10.1002/bit.260400507

No coin nor oath required. For personal study only.

✦ Synopsis

The manufacture, calibration, and signal conditioning during construction of an iridiumhidium oxide pH microsensor is described. The microsensor was designed to be used extracellularly, primarily in biofilm research. The sensing tip diameters were typically in the range of 3-15 pm. The iridium oxide was formed by potential cycling in dilute sulfuric acid. A pH profile across a denitrifying biofilm was measured as an example of an application. The higher Nernstian slope (70-80 mV/pH for fresh electrodes), increased rigidity, and restriction of the sensing tip to the outermost end of the electrode are features which make the iridiumhridium oxide pH microelectrode superior to a glass microelectrode.

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