# 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

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

NoteWhen an automatic titration system is used, titration begins immediately after distillation starts and the 1 % boric acid solution (3.18) is used.
Where a fully automatic distillation unit is employed, the automatic titration of the ammonia can also be carried out with end-point detection using a potentiometric pH system.
In this case an automatic titrator, with a pH-meter is used. The pH-meter shall be calibrated properly in the range of pH 4 to pH 7 following normal laboratory pH-calibration procedures.
The pH end-point of the titration is reached at pH 4,6, being the steepest point in the titration curve (inflection point).

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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/annotation/1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-III/division-C/division-5/division-5.3/division-5.3.2/annotation/1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.