# 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 5.1: Method A

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

Ash the sample using the method described for the determination of crude ash. Ash obtained from that analysis may also be used.
Place the ash in a 250 to 400 ml beaker using 75 ml of hydrochloric acid (3.1). Bring slowly to the boil and boil gently for 15 minutes. Filter the warm solution through an ash-free filter paper and wash the residue with warm water until the acid reaction is no longer visible. Dry the filter containing the residue and ash in a tared crucible at a temperature of not less than 550 oC and not more than 700 oC. Cool in a desiccator and weigh.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/III/division/N/division/5/division/5.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-III/division-N/division-5/division-5.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.