# 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 5.3.2: Boric acid

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

Titrate the contents of the collecting flask with the hydrochloric acid standard volumetric solution (3.19) or with the sulphuric acid standard volumetric solution (3.6) using a burette and read the amount of titrant used.
When colorimetric end-point detection is applied, the end-point is reached at the first trace of pink colour in the contents. Estimate the burette reading to the nearest 0,05 ml. An illuminated magnetic stirrer plate or a photometric detector may aid visualisation of the end-point.
This can be done automatically using a steam distiller with automatic titration.
Follow the manufacturers' instructions for operation of the specific distiller or distiller/titrator.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/III/division/C/division/5/division/5.3/division/5.3.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-III/division-C/division-5/division-5.3/division-5.3.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.