# The Materials and Articles in Contact with Food (Wales) Regulations 2012, Paragraph 3


Reagents
All reagents must be of analytical quality, unless otherwise specified.
Where reference is made to water, it means distilled water or water of equivalent quality.
(a) 4 % (v/v) acetic acid, in aqueous solution
Add 40 ml of glacial acetic acid to water and make up to 1 000 ml.
(b) Stock solutions
Prepare stock solutions containing 1 000 mg/litre of lead and at least 500 mg/litre of cadmium respectively in a 4 % acetic acid solution, as referred to in sub-paragraph (a).

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Source: https://www.legislation.gov.uk/wsi/2012/2705/schedule/4/paragraph/3 (the official version)
Page: https://openlegislation.uk/materials-and-articles-in-contact-with-food-wales-regulations-2012/schedule-4/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.