# 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 4.2: Buffer substate.

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

Dissolve 1,5 g of disodium p-nitrophenylphosphate in sodium carbonate-bicarbonate buffer (4.1) and dilute to 1 000 ml in a volumetric flask with buffer (4.1).
This solution is stable if stored in a refrigerator (≤ 4 oC) for one month but a colour control test should be carried out on such stored solutions — see 6, precaution number 3.

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Source: https://www.legislation.gov.uk/eudr/1979/1067/annex/II/division/9/division/4/division/4.2 (the official version)
Page: https://openlegislation.uk/eu-directive-1979-1067/annex-II/division-9/division-4/division-4.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.