{
  "url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-II/chapter-3./paragraph-3",
  "json_url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-II/chapter-3./paragraph-3.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/II/chapter/3./paragraph/3",
  "kind": "paragraph",
  "number": "3",
  "heading": "REAGENTS",
  "text": "3.1 Sodium hydroxide solution: 40 g per 100 ml, ammonia free.\n3.2 Sulfuric acid, 0.05 M solution.\n3.3 Sulfuric acid, 0.1 M solution.\n3.4 Sulfuric acid, 0.25 M solution.\n3.5 Sodium hydroxide, 0.2 M solution, carbonate free.\n3.6 Chromium metal powder, 100 mesh, low nitrogen content.\n3.7 Anti-bump granules of pumice stone, washed in hydrochloric acid and ignited.\n3.8 Anti-foaming agent, paraffin wax.\n3.9 sulfuric acid (ρ = 1.84 g/ml).\n3.10 Hydrochloric acid (ρ = 1.18 g/ml).\n3.11 Catalyst mixture: 1000 g potassium sulfate and 50 g copper sulfate pentahydrate. The ingredients must be ground and thoroughly mixed.\nIndicator solutions\n3.12 Mixed indicator:\n3.12.1 Mix 50 ml of 2 g/litre ethanolic solution of methyl red with 50 ml of 1 g/litre ethanolic solution of methylene blue.\nMethyl red indicator:\n3.12.2 Dissolve 0.1 g methyl red in 50 ml ethanol. This indicator may be used instead of the preceding one.\n3.13 pH indicator paper, wide range.",
  "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/II/chapter/3./paragraph/3",
    "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."
}