The determination of the total acid number (TAN) in mineral oils and the free fatty acid (FFA) content in edible fats and oils both involve the titration of weakly acidic species in non-aqueous media with a dilute solution of a strong base in alcohol as the titrant. A new thermometric titration procedure overcomes inherent problems with the current manual and potentiometric methods.

Metrohm AG

9100 Herisau