# The Bread and Flour Regulations 1998, Paragraph: Assay


Accurately weigh 0.25 g of sample into a stoppered flask. Add a hot solution of 1.25 g of copper sulphate pentahydrate in 20 ml of water and shake for ten minutes. Filter rapidly and wash the filter with water; acidify the mixed filtrate and washings with sulphuric acid, and titrate with N/10 potassium permanganate. Each ml of N/10 potassium permanganate is equivalent to 0.005585 g of iron.

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Source: https://www.legislation.gov.uk/uksi/1998/141/schedule/2/paragraph/wrapper3n1 (the official version)
Page: https://openlegislation.uk/bread-and-flour-regulations-1998/schedule-2/paragraph-wrapper3n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.