{
  "url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-2./paragraph-8",
  "json_url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-2./paragraph-8.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/2./paragraph/8",
  "kind": "paragraph",
  "number": "8",
  "heading": "EXPRESSION OF RESULT",
  "text": "Express the result of the analysis as the percentage of ammoniacal nitrogen in the fertiliser as received for analysis using the formula\n%N=(50-A)×F for variants (a)and (b)and %N=(35-A)×F for variant (c) where\n50 (or 35 where variant (c) applies) = millilitres of standard solution of sulfuric acid in the receiving flask.\nA = m illilitres of sodium or potassium hydroxide used for the titration.\nF = factor taking into account the weight of sample, the dilution, the volume of the aliquot portion distilled and the volumetric equivalent.\nTABLE FOR METHOD 2\nDetermination of the ammoniacal nitrogen and of the ammoniacal and nitrate nitrogen in fertilisers. Table of the weighing, dilution and calculation to be carried out for each of the variants (a), (b) and (c) of the method.Variant (a) —Approximate maximum quantity of nitrogen to be distilled = 50 mgSulfuric acid 0.05 M to be placed in the receiving flask = 50 mlTitration with sodium or potassium hydroxide, 0.1 M solution\nDeclaration N%\nAmount to be weighed (g)\n(Volume) Dilution (ml)\nVolume of sample solution to be distilled (ml)\nFactor F\n0-5\n10\n500\n50\n0.14\n5-10\n10\n500\n25\n0.28\n10-15\n7\n500\n25\n0.40\n15-20\n5\n500\n25\n0.56\n20-40\n7\n500\n10\n1.00\nVariant (b) —Approximate maximum quantity of nitrogen to be distilled = 100 mgSulfuric acid 0.1 M to be placed in the receiving flask = 50 mlTitration with sodium or potassium hydroxide, 0.2 M solution\nDeclaration N%\nAmount to be weighed (g)\n(Volume) Dilution (ml)\nVolume of sample solution to be distilled (ml)\nFactor F\n0-5\n10\n500\n100\n0.14\n5-10\n10\n500\n50\n0.28\n10-15\n7\n500\n50\n0.40\n15-20\n5\n500\n50\n0.56\n20-40\n7\n500\n50\n1.00\nVariant (c) —Approximate maximum quantity of nitrogen to be distilled = 200 mgSulfuric acid 0.25 M to be placed in the receiving flask = 35 mlTitration with sodium or potassium hydroxide, 0.5 M solution\nDeclaration N%\nAmount to be weighed (g)\n(Volume) Dilution (ml)\nVolume of sample solution to be distilled (ml)\nFactor F\n0-5\n10\n500\n200\n0.175\n5-10\n10\n500\n100\n0.350\n10-15\n7\n500\n100\n0.500\n15-20\n5\n500\n100\n0.700\n20-40\n5\n500\n50\n1.400",
  "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/2./paragraph/8",
    "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."
}