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How temperature influences the pH value

Feb 20, 2023

Article

Even small changes in temperature can significantly impact pH measurements, as the two are linked. The temperature affects a pH measurement in several ways. This blog article will cover the reasons why and discuss how you can handle the different effects from temperature on pH measurements.

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–  Choice of an appropriate membrane glass

–  Correct positioning of the temperature sensor and the pH electrode

–  Combined pH electrodes with «Long Life» reference system

–  Calibration of the pH electrode

–  Temperature of the measuring solutions

Why does temperature affect the pH value?

Temperature and pH value are related by the Nernst equation. This equation describes the ideal relationship between the activity aM of a measuring ion in solution and the potential measured between the reference electrode and the measuring electrode. The temperature influences the Nernst potential – more often called the slope in pH measurement.