# The Preservatives in Food Regulations 1989, Paragraph 3: Reagents


The following reagents shall be used–
(a) concentrated sulphuric acid solution;
(b) silicone-based anti-foaming emulsion;
(c) cyclohexane (analytical reagent grade);
(d) hexane (analytical reagent grade);
(e) ethanol (analytical reagent grade);
(f) anhydrous sodium sulphate;
(g) silica gel GF 254 (Merck or equivalent);
(h) standard 1 per centum (weight/volume) solution of pure biphenyl in cyclohexane: dilute with cyclohexane to obtain the following three solutions–
(i) 0.6 μg/μl;
(ii) 1 μg/μl;
(iii) 1.4 μg/μl.

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Source: https://www.legislation.gov.uk/uksi/1989/533/schedule/5/part/II/paragraph/3 (the official version)
Page: https://openlegislation.uk/preservatives-in-food-regulations-1989/schedule-5/part-II/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.