# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 7: EXPRESSION OF RESULTS


Method of calculation and formula
7.1 The oil retention, from each determination (6.1) expressed as a percentage by mass of the sieved test portion, is given by the equation:
Oil retention=m2-m1m1×100 where:
m1 is the mass, in grams, of the sieved test portion (6.2);
m2 is the mass, in grams, of the test portion according to Section 6.4 or 6.5 respectively as the result of the last weighing.
Take as the result the arithmetic mean of the two individual determinations.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/14b./paragraph/7 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-14b./paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.