# The Preservatives in Food Regulations 1989, Paragraph 6: Observations


For each analysis it is recommended that the spectrophotometric determination be made with two different volumes of the neutralised alkaline extract.
Untreated citrus fruit give by this method a “blank” reading of up to 0.5 mg. per Kg. for oranges and 0.8 mg. per Kg. for lemons.

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Source: https://www.legislation.gov.uk/uksi/1989/533/schedule/5/part/III/paragraph/6 (the official version)
Page: https://openlegislation.uk/preservatives-in-food-regulations-1989/schedule-5/part-III/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.