# 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 7.1.1: Co-chromatography

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

A sample extract (5.2.1 or 5.2.2) is fortified by addition of an appropriate amount of calibration solution (3.10). The amount of added diclazuril must be similar to the amount of diclazuril found in the sample extract.
Only the height of the diclazuril peak and the internal standard peak shall be enhanced after taking into account both the amount added and the dilution of the extract. The peak width, at half of its height, must be within ± 10 % of the original width of the diclazuril peak or the internal standard peak of the unfortified sample extract.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/IV/division/F/division/7/division/7.1/division/7.1.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-IV/division-F/division-7/division-7.1/division-7.1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.