# Feeding Stuffs (Sampling and Analysis) Regulations (Northern Ireland) 1999, Paragraph 5.3: Calibration Curve

Extent: N.I.
Status: prospective

Into a series of 50 ml centrifuge tubes, transfer by pipette 2, 4, 6, 8, 10 and 12 ml standard uric acid solution (3.9) (corresponding to 2, 4, 6, 8, 10 and 12 mg of uric acid) and make up to 20 ml with ethanolic formaldehyde solution (3.3). Add to each tube 10 ml Benedict and Hitchcock reagent (3.8), mix well and stand in the dark for 1 hour. Continue as in 5.2 from “…. Centrifuge at 2,000 rpm. …”. Measure the absorbances of the solutions and plot the calibration curve using absorbances as the ordinates and the corresponding quantities of uric acid, in mg (as shown above) as the abscissae.

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Source: https://www.legislation.gov.uk/nisr/1999/296/schedule/2/paragraph/5.3 (the official version)
Page: https://openlegislation.uk/feeding-stuffs-sampling-and-analysis-regulations-northern-ireland-1999/schedule-2/paragraph-5.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.