# Regulation (EC) No 648/2004 of the European Parliament and of the Council of 31 March 2004 on detergents (Text with EEA relevance), Division 4.1.2: Ion-exchange procedure

Extent: E+W+S+N.I.

Isolation and separation of anionic surface active agents from soap, non-ionic and cationic surfactants are required for correct biodegradability tests.
This is achieved by an ion-exchange technique using a macro-porous exchange resin and suitable eluants for fractional elution. Thus soap, anionic and non-ionic surfactants may be isolated in one procedure.

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Source: https://www.legislation.gov.uk/eur/2004/648/annex/VIII/division/4/division/4.1/division/4.1.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2004-648/annex-VIII/division-4/division-4.1/division-4.1.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.