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


4.1 Hydrogen peroxide solution (H2O2 ρ = 1.11 g/ml) 30%.
Sodium hydroxide solution, about 2 M
4.2 Dissolve 8 g of sodium hydroxide in pellet form in 100 ml of water.
Diluted hydrochloric acid solution, about 6 M
4.3 Mix one volume of hydrochloric acid (ρ = 1.18 g/ml) with 1 volume of water.
4.4
Acetic acid (99.7% CH3COOH) (ρ = 1.05 g/ml)
Acetic acid solution (1:2), about 6 M
4.5 Mix one volume of acetic acid (4.4) with 2 volumes of water.
4.6 Solution of 1-nitroso-2-naphthol in 100 ml of acetic acid (4.4). Add 100 ml of lukewarm water. Mix thoroughly. Filter at once. The solution obtained must be used immediately.

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