Abstract
The base content, total base number (TBN), has been determined for a range of petroleum products and used engine oils, by both potentiometric and conductimetric methods. Titration values depend both on the method of detection and solvent media used. A conductimetric titration method for TBN is described based upon IP 177 and 276 (ASTM D-664 and 2896) solution chemistry. The results of the conductimetric titration TBN determinations are compared with those from IP 177 and IP 276 potentiometric determinations to show that the TBN order of magnitude is IP 276 (potentiometric) > conductimetric > IP 177 (potentiometric). The conductimetric method equilibrates very rapidly and is suitable for automatic titrimeters. Results for new and used oils determined by these different titration methods are discussed. Conductimetric detection for TBN determination uses standard IP method reagents and solvents and is an alternative to the trisolvent TBN method.
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