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


The content of combustible ingredients (C), expressed as carbon, as a percentage by mass of the sample, is given by the formula:
C%=0.06×V1—V2E where:
E = the mass in grams of the test portion:
V1 = the total volume in ml of 0.1 M hydrochloric acid added after the change in colour of the phenolphthalein;
V2 = the volume in ml of the 0.1 M sodium hydroxide solution used in the titration.

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