Methods of test for petroleum and its products -- Determination of acidity, neutralization value. Colour indicator titration method
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 120mm2/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 to be obtained.
| SDO | BSI: British Standards Institution |
| Document Number | 2000-1 |
| Publication Date | March 31, 1995 |
| Language | en - English |
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| Committee | PTI/13 |
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