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


3.1 Analytical-grade chromium VI oxide; CrVIO3
3.2 Sulfuric acid diluted to 60% by volume: pour 360 ml of water into a one litre beaker and carefully add 640 ml of sulfuric acid, density at 20°C ρ = 1.83 g/ml.
3.3 Silver nitrate: 0.1 M solution.
3.4 Barium hydroxide: weigh out 15 grams of barium hydroxide (Ba(OH)2.8H2O), and dissolve completely in hot water. Allow to cool and transfer to a one-litre flask. Fill up to the mark and mix. Filter through a pleated filter paper.
3.5 Hydrochloric acid: 0.1 M standard solution.
3.6 Sodium hydroxide: 0.1 M standard solution.
3.7 Bromophenol blue: solution of 0.4 grams per litre in water.
3.8 Phenolphthalein: solution of 2 grams per litre in 60% by volume ethanol.
3.9 Soda lime: particle dimensions, about 1.0 to 1.6 mm.
3.10 Demineralised water, freshly boiled to remove carbon dioxide.

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