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ISO 3771:2011

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

Standard Details

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.

General Information

Status : Published
Standard Type: Main
Document No: ISO 3771:2011
Document Year: 2011
Pages: 8
Edition: 3
  • Section Volume:
  • ISO/TC 28. Petroleum and related products, fuels and lubricants from natural or synthetic sources
  • ICS:
  • 75.080 Petroleum products in general

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ISO 3771:2011

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