M00001829
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ISO 3771 3rd Edition, September 15, 2011 Petroleum products — Determination of base number — Perchloric acid potentiometric titration method
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Availability date: 07/13/2021
Description / Abstract:
This International Standard specifies a method for the
determination of basic constituents in petroleum products by
potentiometric titration with perchloric acid in glacial acetic
acid.
The constituents that can be considered to have basic
characteristics include organic and inorganic bases, amino
compounds, salts of weak acids (e.g. soaps), basic salts of
polyacid bases, and salts of heavy metals.
The ranges of base number values for which precision values for
the method have been established are:
— unused oils: base numbers from 3 to 45;
— additive concentrates: base numbers from 5 to 45;
— used oils: base numbers from 3 to 30.