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Potentiometric Determination of TBN in Petroleum Products According to ISO 3771

Published: Thursday, June 13, 2013
Last Updated: Thursday, June 13, 2013
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Metrohm has published a new application note on the potentiometric determination of TBN according to ISO 3771 using the Solvotrode easyClean.

 A blank titration is performed using 100 mL solvent and standardized c(HClO4) = 0.1 mol/L as titrant. 

An appropriate amount of well-mixed sample is weighed into the titration vessel and 100 mL solvent are added. Proceed with the titration using standardized c(HClO4) = 0.1 mol/L.


After the titration, the electrode and burette tips are rinsed first with the solvent mixture followed by deionized H2O. In order to rehydrate the membrane of the electrode, it is placed for 3 to 5 min in deionized H2O. Before the next measurement, the electrode is rinsed shortly with solvent mixture.

The application note, AN T-097, can be downloaded free of charge from

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