# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 9: EXPRESSION OF RESULTS


The calcium (Ca) content of the fertiliser is as follows:
Ca(%)=n×0.2004×t0.02×v1v2×m where:
n = the volume of 0.2 M permanganate used, in millilitres,
m = the mass of the test sample in grams,
v2 = the aliquot volume in millilitres,
v1 = the volume of the extraction solution in millilitres,
t = the molarity of the permanganate solution in moles per litre.
CaO (%) = Ca (%) × 1.400.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/20./paragraph/9 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-20./paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.