Abstract
A high-frequency microtitration method is described for the determination of total acid number in new and used lubricating oils. The sample, dissolved in toluene-ethanol (7 + 3), is titrated with standard alcoholic tetramethylammonium hydroxide solution. A study of solvents, titrants, sample size and other experimental parameters is reported. This method provides sharp breaks at the end-point and more repeatable results faster than those obtained with the standard potentiometric method. The method can be expanded to the macro-scale using a commercially available titrator and offers an alternative to the ASTM and IP methods for the determination of total acid number.
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