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


1 ml of standard sodium thiosulfate solution (4.5) corresponds to 2 mg Cu.
The percentage of copper in the fertiliser is given by:
Cu(%)=X×—————Va×M×5 where:
X is the volume in ml of the sodium thiosulfate solution used;
V is the volume in ml of the extract solution in accordance with Methods 26a and 26b;
a is the volume in ml of the aliquot portion;
M is the mass in g of the test sample treated in accordance with Methods 26a or 26b.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/26g./paragraph/7 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-26g./paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.