How can ph be measured

The glass electrode method is widely used, not only in industry but also in many other fields. The semiconductor pH sensor, whose development started around , replaces a glass electrode with a semiconductor chip.

This sensor, known as an ion sensitive field effect transistor ISFET , is not only resistant to damage but also easily miniaturized. Miniaturization allows the use of smaller amounts of sample for measurement, and makes it possible to perform measurements in very small spaces and on solid state surfaces. This sensor promises useful applications in measurement in the fields of biology and medicine.

This is a measurement method in which pH is determined at multiple points and the results displayed as an image. It has been attracting attention as a technology for visualizing pH distributions. Historically, the method mentioned in Section 1 , which combines pH indicators and microscopes, has been used to measure the pH inside cells. However, the invention of pH-sensitive dyes and proteins as a replacement for pH indicators has aided investigation of pH distribution in cells.

In recent years, there have been examples of reports in which the multiple arrays of semiconductor pH sensors described in Section 6 have been used for pH imaging. Reference: Satoshi Nomura, Bunseki, vol. Relation page The Basis of pH. Are you sure the electrode you're using is best for the application? Pierre and Chris Cushman as they discuss everything you need to know - from basic measurement principles to electrode cleaning - about measuring pH in the lab.

There are many reasons for poor pH data - inappropriate electrode for the application, incorrect measurement and calibration procedures, improper electrode storage. This discussion will be targeted at eliminating these sources of measurement error, allowing you to become more confident in the pH data you collect.

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Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Featured Video. Cite this Article Format. Helmenstine, Anne Marie, Ph. Chemistry Terminology: Definition of pOH. How to Calculate the pH of a Weak Acid.