What is the best way to measure pH in high temperature samples?

Document ID

Document ID TE3002

Published Date

Published Date 12/04/2019
Question
What is the best way to measure pH in high temperature samples?
Summary
pH measurements at high temperatures
Answer
Before measuring samples over 80 °C, check whether the probe is designed to stand such high temperatures. Certain gel-filled probes can be used up to 80 °C, but no higher. Refillable pH probes with saturated KCl filling solution are recommended. As KCl crystals are soluble at higher temperatures, it is a good idea to ensure the excess crystals are in solution so that the solution remains saturated. Ideally, please ensure the sample and buffer temperatures are as close as possible.

For more information on temperature compensation of pH electrodes, please click here.