# First Commission Directive of 25 October 1985 on methods of analysis for edible caseins and caseinates (85/503/EEC), Division 4.1: Buffer solutions, for calibration of the pH meter (5.2)

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

Two standard buffer solutions with pH values at 20 oC which are known to the second decimal place and will bracket the pH value of the sample under test, for example phtalate buffer solution of pH approximately 4 and a borax buffer solution of pH approximately 9.

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Source: https://www.legislation.gov.uk/eudr/1985/503/annex/II/division/7/division/1/division/4/division/4.1 (the official version)
Page: https://openlegislation.uk/eu-directive-1985-503/annex-II/division-7/division-1/division-4/division-4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.