# Regulation (EC) No 648/2004 of the European Parliament and of the Council of 31 March 2004 on detergents (Text with EEA relevance), Division 4.4.3: CATION-EXCHANGE COLUMN

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

Place 600 ml cation-exchange resin (4.3.6) in a 3 000 ml beaker and cover by adding 2 000 ml hydrochloric acid (4.3.8). Allow to stand for at least two hours, with occasional stirring.
Decant the acid and transfer the resin into the column (4.3.12) by means of deionised water. The column should contain a glass-wool plug.
Wash the column with deionised water at a rate of 10-30 ml/min until the eluate is free of chloride.
Displace the water with 2 000 ml isopropanol/water mixture (4.3.3) at a rate of 10-30 ml/min. The exchange column is now ready for operation.

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Source: https://www.legislation.gov.uk/eur/2004/648/annex/VIII/division/4/division/4.4/division/4.4.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2004-648/annex-VIII/division-4/division-4.4/division-4.4.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.