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Best practice for electrodes in titration

Jul 6, 2020

Article

After my earlier blog post on the topic of «Avoiding the most common mistakes in pH measurement», I will now cover the subject of electrodes that are relevant for titration. Here you will not only find out how to select the right electrode for your application – but also how to clean and to maintain it, and most importantly, how you can assure that your electrode is still ok to be used. 

The following topics will be covered (click to go directly to the topic):

How to select the right sensor

You might wonder what you need to consider when selecting a suitable sensor for your titration, as a huge variety of different sensors exist. The right sensor needs to be selected based on the type of titration that you want to carry out. For a redox titration, you will need a different sensor than for a complexometric titration.

Furthermore, the sensor selection is highly dependent on matrix, the sample volume, or possible interferences. If you are working in nonaqueous media, you must especially consider any electrostatic effects that might arise. Therefore, I recommend working with an electrode that offers an internal electrical shielding.

The sensor has to show a fast response time and needs to be robust enough for the application, meaning it needs to be resistant to the chemicals used and to the applied cleaning procedure.