The acid number (AN) and base number (BN) are crucial parameters in the quality control and validation of refined petroleum products. This Application Note describes the potentiometric determination of the AN according to ASTM D664 and IP 177 with a reduced solvent volume of 60 mL as well as the BN according to ISO 3771 using a fully automated OMNIS system. For the indication a dSolvtrode was used.

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