# First Commission Directive of 13 November 1979 laying down Community methods of analysis for testing certain partly or wholly dehydrated preserved milk for human consumption (79/1067/EEC), Division 4.1: Solution A

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

Barium borate hydroxide buffer: pH 10,6 ± 0,1 at 20 o C.
Dissolve: 25,0 g of barium hydroxide (Ba(OH)2.8H2O) in water and dilute to 500 ml.
Dissolve: 11,0 g of boric acid (H3BO3) in water and dilute to 500 ml.
Warm the two solutions to 50 o C and mix.
Shake and cool the mixture to room temperature.
Adjust the pH to 10,6 ± 0,1 with the barium hydroxide solution and filter.
Store the solution in a tightly stoppered container.
Before use, dilute the buffer with an equal quantity of water.

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Source: https://www.legislation.gov.uk/eudr/1979/1067/annex/II/division/8/division/4/division/4.1 (the official version)
Page: https://openlegislation.uk/eu-directive-1979-1067/annex-II/division-8/division-4/division-4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.