What is the best way to measure pH in high temperature samples?
pH measurements at high temperatures
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.