Total Base Number
Method Abstract #102
Scope and Application
This method conforms to ASTM D 4739. It measures the quantity of basic components in an oil sample. It can be considered as a measure of the alkalinity of the oil, or of the oil’s ability to neutralize acids produced during combustion.
TBN determination involves the addition of a tri solvent made from equal parts of chloroform, toluene and 2 propanol with a small amount of water to an oil sample. Once dissolved, the sample is titrated with alcoholic hydrochloric acid to an inflection endpoint. A backup set endpoint at 240 mV is simultaneously calculated in the case of a weak inflection.