Electrodes for Potential Measurements in Aqueous Systems at High Temperatures and Pressures

✍ Scribed by Dr. Leonard W. Niedrach

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 730 KB
• Volume: 26
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.198701613

✦ Synopsis

The measurement of pH, redox potentials, and corrosion potentials at high temperatures and pressures is often desirable for the control and monitoring of industrial processes; e.g., for controlling water chemistry in conventional and nuclear power generators, for process control in the chemical industry, and for monitoring performance in petroleum extraction and refining. Such measurements are also needed for research on the thermodynamics of high-temperature aqueous solutions including those associated with geothermal and hydrothermal reactions. Zirconia electrodes for these purposes are described, and their application is illustrated with examples.

While not yet routinely available on a commercial basis, useful versions can be readily fabricated in the laboratory. Some of the pitfalls encountered in making such measurements at elevated temperatures are also discussed because great care is often required to assure that valid and useful data are being obtained.