In situ calibrated oxygen electrode
by Johnson, C. D.; Paul, D. W.
Applications for determining dissolved oxygen cover many scientific fields ranging from aquatic to medicinal. Dissolved oxygen is often measured using a Clark electrode, however this device needs frequent recalibration due to changes in:sensitivity caused by environmental conditions. External methods of calibration require removal of the sensor from the working environment. In this work, an oxygen-generating electrode is used to recalibrate the Clark-type oxygen-detecting electrode in situ. Preliminary data show that the new calibration procedure provides an estimate of the sensitivity to within 7.5% of the actual value determined experimentally. In situ calibration would have an enormous impact on the way chemical and biological processes are monitored.