{
  "url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-26i./paragraph-4",
  "json_url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-26i./paragraph-4.json",
  "legislation": "nisr/1996/513",
  "legislation_title": "Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996",
  "legislation_url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996",
  "path": "schedule/2/part/I/chapter/26i./paragraph/4",
  "kind": "paragraph",
  "number": "4",
  "heading": "REAGENTS",
  "text": "4.1 Concentrated sulfuric acid (H2SO4, ρ = 1.84 g/ml).\nSulfuric acid, about 9 M\n4.2 Carefully mix 1 volume of concentrated sulfuric acid (4.1) with 1 volume of water.\nNitric acid, 6 M\n4.3 Mix 3 volumes of nitric acid (HNO3, ρ = 1.40 g/ml) with 4 volumes of water.\nNitric acid, 0.3 M\n4.4 Mix 1 volume of 6 M nitric acid with 19 volumes of water.\n4.5 Sodium bismuthate (NaBiO3) (85%).\n4.6 Kieselguhr.\n4.7 Orthophosphoric acid, 15 M (H3PO4, ρ = 1.71 g/ml).\nFerrous sulfate solution, 0.15 M\n4.8 Dissolve 41.6 g of ferrous sulfate heptahydrate (FeSO4, 7 H2O) in a 1 litre volumetric flask.\nAdd 25 ml of concentrated sulfuric acid (4.1) and 25 ml phosphoric acid (4.7). Make up to 1000 ml. Mix.\nPotassium permanganate solution, 0.02 M\n4.9 Weigh out 3.160 g of potassium permanganate (KMnO4) to within 0.1 mg. Dissolve and make up 1000 ml with water.\nSilver nitrate solution, 0.1 M\n4.10 Dissolve 1.7 g of silver nitrate (AgNO3) in water and make up to 100 ml.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/26i./paragraph/4",
    "retrieved_at": "2026-10-29T02:32:40.012993+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}