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


For the EEC fertilisers to which the method is applicable (5 g of fertiliser in 500 ml of extract), the percentage content of the fertiliser is:
MgO(%)inthefertiliser=(b-a)×TM Mg(%)inthefertiliser=——-—-—(b-a)×TlM where:
a = the volume in millilitres of 0.05 M EDTA solution used for the titration in the presence of calcein or calcon carbonic acid.
b = the volume in millilitres of 0.05 M EDTA solution used for the titration in the presence of Eriochrome black-T.
M = the mass of the sample present in the aliquot taken (in grams).
T = 0.2016× molarity of the EDTA solution/0.05 (see 4.2).
Tl = 0.1216× molarity of the EDTA solution/0.05 (see 4.2).

---
Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/22./paragraph/9 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-22./paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.