International Standard
ISO 2271:1989
Surface active agents — Detergents — Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
Reference number
ISO 2271:1989
Edition 2
International Standard
Read sample
ISO 2271:1989
Published (Edition 2, 1989)
This standard was last reviewed and confirmed in 2021. Therefore this version remains current.

ISO 2271:1989

ISO 2271:1989
CHF 42
Convert Swiss francs (CHF) to your currency


The substance is determined in a medium consisting of an aqueous and a chloroform phase by titration with a standard volumetric cationic-active solution (benzethonium- chloride) in the presence of an indicator which consists of a mixture of cationic dye (dimidium bromide) and an anionic dye (acid blue 1). The method is applicable to solids or to aqueous solutions of the active material. The relative molecular mass of the anionic active matter has to be known. The method is not applicable if cationic surface active agents are present.

General information

  •  : Published
     : 1989-10
    : International Standard confirmed [90.93]
  •  : 2
     : 6
  • ISO/TC 91
  • RSS updates

Life cycle

Got a question?

Check out our Help and Support

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)