# 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 2: Principle

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

The sample is mineralised, either by dry combustion (in the case of organic feed) or by acid digestion (in the case of mineral compounds and liquid feed), and placed in an acid solution. The solution is treated with molybdovanadate reagent. The optical density of the yellow solution thus formed is measured in a spectrophotometer at 430 nm.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/III/division/P/division/1/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-III/division-P/division-1/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.