The determination of pH is a relatively inexpensive measurement and one that is frequently used for a wide variety of applications. This module guides the user through the theory, the mathematics and significance of the measurement, instrumentation, techniques and skills necessary to obtain reliable data.
John has worked in the field of analytical chemistry for over 45 years and has gained experience in a wide variety of analytical techniques and instrumentation in several industries and applications. He has always been interested in understanding the technology well and utilizing it at its optimum in order to produce reliable and accurate chemical data. To this end he is committed to enable others to not only use the technology correctly but also understand what it does, how it works and how to maintain it.
Overview of pH measurement and some of its applications. The user is introduced to the equipment and the theory and mathematics are explained, arriving at the Nernst equation and how it is relevant to pH. The construction and function of pH and reference electrodes is covered, including combined electrodes.
This module describes the measurement itself, calibration using standards (buffers), quality control and some errors that occur (particularly when measuring outside of the normal sample types) and how to deal with them. Measurement of pH in high purity water can be tricky and some guidance is included.
Maintenance of equipment is always important, and instruction is given on this topic, starting with housekeeping and electrode care. Troubleshooting tips are included, to identify the cause and take appropriate corrective action. Finally, a demonstration of taking field (portable pH) measurements is included.