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IP 1: Determination of acidity, neutralization value - Colour indicator titration method
- Method adopted/last revised: 1994
- Method reapproved: 2004
- REF/ISBN: IP001-2934869
- Status: Current
- First printed in STM books: January 1994
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Scope
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 mm2/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 shold 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 to be obtained.
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