# Commission Regulation (EC) No 2870/2000 of 19 December 2000 laying down Community reference methods for the analysis of spirits drinks, Division 4.8: Reagent for phosphate determination:

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

dissolve 20 g of ammonium molybdate (CAS 12054-85-2), (NH 4 ) 6 Mo 7 O 24 .4H 2 O in 400 ml water at 50 o C;
dissolve, in another vessel, 1 g of ammonium vanadate (CAS 7803-55-6), NH 4 VO 3 , in 300 ml hot water, allow to cool, then add 140 ml of concentrated nitric acid (CAS 7697-37-2). Combine the cooled solutions in a 1 000 ml volumetric flask and make up to the 1 000 ml mark.

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Source: https://www.legislation.gov.uk/eur/2000/2870/annex/division/IX/division/4/division/4.8 (the official version)
Page: https://openlegislation.uk/eu-regulation-2000-2870/annex/division-IX/division-4/division-4.8
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.