# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 5: EVALUATION OF RESULTS


5.1 Convert the fraction masses to a percentage of the total of the fraction masses (not of the original charge).
Calculate the percentage in the receiver (ie < 0.5 mm): A%
Calculate the percentage retained on the 0.5 mm sieve: B%
Calculate the percentage passing 1.0 mm, ie (A + B)%.
The sum of the fraction masses should be within 2% of the initial mass taken.
5.2 At least two separate analyses should be carried out and the individual results for A should not differ by more than 1.0% absolute and for B by more than 1.5% absolute. Repeat the test if this is not the case.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/14e./paragraph/5 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-14e./paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.