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


4.1 Diluted hydrochloric acid:
One volume of hydrochloric acid (ρ = 1.18 g/ml) plus one volume of water.
4.2 1:10 dilute sulfuric acid:
One volume of sulfuric acid (ρ = 1.84 g/ml) in ten volumes of water.
4.3 1:1 dilute ammonia solution:
One volume of ammonia (ρ = 0.88 g/ml) and one volume of water.
4.4 Saturated solution of ammonium oxalate [(NH4)2 C2O4 H2O] at ambient temperature (approximately 40 g per litre).
4.5 Citric acid solution, 30% (m/v).
4.6 Ammonium chloride solution, 5% (m/v).
4.7 Solution of bromothymol blue in 95% ethanol, 0.1% (m/v).
4.8 Solution of bromocresol green in 95% ethanol, 0.04% (m/v).
4.9 Standard solution of potassium permanganate, 0.02 M.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/20./paragraph/4 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-20./paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.