# 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 7.4

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

Requirements for methods using not all six isotope-labelled internal standards or other internal standards:
(a)recovery of internal standard(s) shall be controlled for every sample;
(b)recoveries of internal standard(s) shall be between 60 and 120 %;
(c)results shall be corrected for recoveries of internal standards.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/V/division/B/chapter/III/division/7/division/7.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-V/division-B/chapter-III/division-7/division-7.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.