# The Feedingstuffs (Zootechnical Products) Regulations 1999, Paragraph 6


CALCULATION OF RESULTS
The meticlorpindol contents in mg/kg of sample is given by the formula:
23.23×C×50M
in which:
C=concentration of meticlorpindol, in μg per ml, read from the calibration curve equivalent to the absorbance of the test solution;
23.23=a factor that makes allowance for the volume of the feed sample in the flask;
and
M=mass of test portion in g.
Absorbance at 327 and 297nm should not differ by more than 0.05 units and both points should be below 0.2. Results should be satisfactory as long as these criteria are kept in mind along with any obvious distortion in the appearance of the curve. No maximum other than that of meticlorpindol should be present.

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Source: https://www.legislation.gov.uk/uksi/1999/1871/schedule/5/part/II/paragraph/6 (the official version)
Page: https://openlegislation.uk/feedingstuffs-zootechnical-products-regulations-1999/schedule-5/part-II/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.