# 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 3.11.1: Carbadox stock standard solution, 100 μg/ml (see Note 5. Procedure):

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

Weigh to the nearest 0,1 mg, 25 mg of carbadox standard substance (3.11) into a 250 ml graduated flask. Dissolve in methanol-acetonitrile (3.5) by ultrasonification (4.7). After ultrasonic treatment bring the solution to room temperature, make up to the mark with methanol-acetonitrile (3.5) and mix. Wrap the flask with aluminium foil or use amber glassware and store in a refrigerator. At a temperature of ≤ 4 oC the solution is stable for 1 month.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/VIII/division/D/division/3/division/3.11.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-VIII/division-D/division-3/division-3.11.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.