# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 3: REAGENTS


Distilled or demineralised water, free from chloride ions.
3.1 Acetone AR.
3.2 Concentrated nitric acid (density at 20°C ρ = 1.40 g/ml).
3.3 Silver nitrate 0.1 M standard solution. Store this solution in a brown glass bottle.
3.4 Silver nitrate 0.004 M standard solution — prepare this solution at the time of use.
3.5 Potassium chloride 0.1 M standard reference solution. Weigh, to the nearest 0.1 mg, 3.7276 grams of analytical-grade potassium chloride, previously dried for one hour in an oven at 130°C and cooled in a desiccator to ambient temperature. Dissolve in a little water, transfer the solution without loss into a 500 ml standard flask, dilute to the mark and mix.
3.6 Potassium chloride 0.004 M standard reference solution — prepare this solution at the time of use.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/14f./paragraph/3 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-14f./paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.