# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 8: EXPRESSION OF RESULTS


The percentage elemental sulfur (S) content of the fertiliser is as follows:
Impure S (%) of the fertiliser=P1-P0m×100 Purity of sulfur extracted (%)=P2-P3n×100 Pure S (%) of the fertiliser=(P1-P0)(P2-P3)m×n×100 where:
m = the mass of the test sample of fertiliser in grams,
P0 = the mass of the Soxhlet flask in grams,
P1 = the mass of the Soxhlet flask and the impure sulfur after drying,
n = the mass of impure sulfur to be purified in grams,
P2 = the mass of the Petri dish and the sample,
P3 = the mass of the Petri dish after sublimation of the sulfur.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/19./paragraph/8 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-19./paragraph-8
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.