Determination of the acid number according to ASTM D664 and the base number in fresh motor oil


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 D644 with a reduced solvent volume of 60 mL as well as the BN using a fully automated OMNIS system. For the indication a dSolvtrode was used.