EI 1


Determination of acidity, neutralization value - Colour indicator titration methodThe Energy Institute / 1994 / 3 pages

This standard describes methods for the determination of the acidity of unused lubricating oil (see note 3), fuel oil, and petrolatum. Two alternative methods, A and B, are given for the determination of acidity. Method A is more suitable than method B for dark coloured oils and oils of viscosity higher than 120 mm*/s (cSt) at 40°C and petrolatums. Method B is often preferred for pale coloured, low viscosity oils such as transformer oil. Method C is used
to calculate organic acidity.
NOTE 1 Oils containing additives may give erroneous results.
NOTE 2 If there is elemental sulfur in solution, method A should be used, as method B may give rise to erroneous results due to interference with the indicator.
NOTE 3 The acidity of oxidized oils may also be determined by this method but precision has yet to be established.
NOTE 4 Results obtained by IP 139 are generally comparable with those obtained by method A of this standard, though with some oils, particularly used oil and those containing additives. there is a tendency for higher figures fo be obtained. (Reapproved 2004)

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