What is the best way to measure the pH of highly alkaline samples and samples with high salt content?

Dokument-ID

Dokument-ID TE5130

Veröffentlichungsdatum

Veröffentlichungsdatum 25.01.2018
Frage
What is the best way to measure the pH of highly alkaline samples and samples with high salt content?
Zusammenfassung
pH in highly alkaline samples and samples with high salt content.
Antwort
In order to measure high alkaline samples and samples with high salt content it is recommended to use pH probes with saturated KCl filling solution. As KCl crystals are soluble at higher temperatures, it is a good idea to have excess crystals remain in the filling solution to ensure the solution remains saturated. Samples with high salt content and a pH greater than 12 may be subject to the "sodium error". Hach manufactures probes specifically designed for high alkaline samples; for example the PHC705A probe would work well for such a sample.

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