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ISO 3771:2011

Petroleum products — Determination of base number — Perchloric acid potentiometric titration method

Sep 5, 2011

General information

90.93     Sep 26, 2022

ISO

ISO/TC 28

International Standard

75.080  

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Scope

ISO 3771:2011 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.


Life cycle

PREVIOUSLY

WITHDRAWN
ISO 3771:1994

NOW

PUBLISHED
ISO 3771:2011
90.93 Standard confirmed
Sep 26, 2022

National adoptions

SRPS ISO 3771:2014  
ISS

Petroleum products — Determination of base number — Perchloric acid potentiometric titration method

90.93   Standard confirmed

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