# Regulation (EC) No 648/2004 of the European Parliament and of the Council of 31 March 2004 on detergents (Text with EEA relevance), Division 3.3.4: The titration

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

Stir the solution using a magnetic stirrer (3.2.16), add a few drops of bromocresol purple (3.2.5) and add the dilute ammonia solution (3.2.9) until the colour turns violet (the solution is initially weakly acid from the residue of acetic acid used for rinsing).
Then add 10 ml standard acetate buffer (3.2.10), immerse the electrodes in the solution, and titrate potentiometrically with standard ‘carbate solution’ (3.2.11), the burette tip being immersed in the solution.
The titration rate should not exceed 2 ml/min.
The endpoint is the intersection of the tangents to the two branches of the potential curve.
It will be observed occasionally that the inflection in the potential curve becomes flattened; this can be eliminated by carefully cleaning the platinum electrode (by polishing with emery paper).

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Source: https://www.legislation.gov.uk/eur/2004/648/annex/VIII/division/3/division/3.3/division/3.3.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2004-648/annex-VIII/division-3/division-3.3/division-3.3.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.