APPLICATION OF CYCLOVOLTAMMETRIC MEASUREMENT OF pH VALUE USING METAL-METAL OXIDE-BASED SENSORS
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
A metal-metal oxide electrode can be used to measure the pH of a solution by utilizing cyclovoltammetry. Cyclovoltammetry allows the chemical reaction preceding the oxidation or reduction voltage shift reaction to be controlled so that the integrity of the oxide layer on the electrode surface is preserved for accurate measurement. Cyclovotammetry is an electroanalytical technique in which a voltage is applied at a predetermined scan rate and the current-voltage relationship is then examined. However, the voltage shifts due to oxidation or reduction peaks are affected by the integrity of the electrode surface since these peak shifts represent a surface reaction. The integrity of the electrode surface has been found to depend on the electrochemical reaction prior to the voltage shift reaction.