# 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 3.23: Oxidation mixture (Performic acid — phenol):

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

Mix 0,5 ml hydrogen peroxide (3.1) with 4,5 ml formic acid-phenol solution (3.19) in a small beaker. Incubate at 20-30 oC for 1 hour in order to form performic acid, then cool on an ice-water bath (15 min.) before adding to the sample.
Caution: Avoid contact with skin and wear protective clothing.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/III/division/F/division/3/division/3.23 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-III/division-F/division-3/division-3.23
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.