# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 7: PROCEDURE


Test sample
7.1 (a) Where fertilisers contain no sulfur or where they contain, at the same time, no more than 3% of sulfur (S) i.e. 7.5% SO3, and no more than 4% of calcium (Ca) i.e. 5.6% CaO, weigh out 5 g of fertiliser to within 1 mg.
(b) Where fertilisers contain more than 3% of sulfur (S) and more than 4% of calcium (Ca), weigh out 1 g of fertiliser to within 1 mg.
Place the test sample in a 600 ml beaker.
Preparation of the solution
7.2 Add approximately 400 ml of water and boil for 30 minutes. Allow to cool, stirring occasionally, and transfer quantitatively into a 500 ml graduated flask. Make up to volume with water and mix.
Filter through a dry filter into a dry container.
Discard the initial portion of the filtrate. The filtrate must be completely clear.
Stopper if the solution is not to be used immediately.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/17./paragraph/7 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-17./paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.