Iridium Oxide pH Microelectrode. (Reannouncement with New AvailabilityInformation)

摘要

The manufacture, calibration, and signal conditioning during construction of aniridium/iridium 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 um. 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 and of the electrode are features which make the iridium/iridium oxide pH microelectrode.