# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 4: REAGENTS


4.1 Concentrated sulfuric acid (H2SO4, ρ = 1.84 g/ml).
Sulfuric acid, about 9 M
4.2 Carefully mix 1 volume of concentrated sulfuric acid (4.1) with 1 volume of water.
Nitric acid, 6 M
4.3 Mix 3 volumes of nitric acid (HNO3, ρ = 1.40 g/ml) with 4 volumes of water.
Nitric acid, 0.3 M
4.4 Mix 1 volume of 6 M nitric acid with 19 volumes of water.
4.5 Sodium bismuthate (NaBiO3) (85%).
4.6 Kieselguhr.
4.7 Orthophosphoric acid, 15 M (H3PO4, ρ = 1.71 g/ml).
Ferrous sulfate solution, 0.15 M
4.8 Dissolve 41.6 g of ferrous sulfate heptahydrate (FeSO4, 7 H2O) in a 1 litre volumetric flask.
Add 25 ml of concentrated sulfuric acid (4.1) and 25 ml phosphoric acid (4.7). Make up to 1000 ml. Mix.
Potassium permanganate solution, 0.02 M
4.9 Weigh out 3.160 g of potassium permanganate (KMnO4) to within 0.1 mg. Dissolve and make up 1000 ml with water.
Silver nitrate solution, 0.1 M
4.10 Dissolve 1.7 g of silver nitrate (AgNO3) in water and make up to 100 ml.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/26i./paragraph/4 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-26i./paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.