Methods of test for petroleum and its products - Part 182: Determination of inorganic acidity of petroleum products - Colour indicator titration method (Identical with IP 182:2006)
This standard specifies a method for determining the water soluble inorganic (strong) acid content of used and unused lubricating oils, fuel oils, and petrolatum.
NOTE 1 - Oils containing additives that can be extracted
with water may give erroneous results.
NOTE 2 - The results may not be numerically identical with those obtained when other colour indicators or techniques are used.