# Commission Regulation (EC) No 152/2009 of 27 January 2009 laying down the methods of sampling and analysis for the official control of feed (Text with EEA relevance), Division 3.24: Citrate buffer, c = 0,2 mol Na+/l, pH 2,2:

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

Dissolve 19,61 g sodium citrate (3.8), 5 ml thiodiglycol (3.9), 1 g phenol (3.3) and 16,5 ml HCl (3.7) in approximately 800 ml water. Adjust pH to 2,2. Make up to 1 litre with water.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/III/division/F/division/3/division/3.24 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-III/division-F/division-3/division-3.24
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.