{
  "url": "https://openlegislation.uk/eu-directive-1979-796/annex-II/division-7/division-6/division-6.3",
  "json_url": "https://openlegislation.uk/eu-directive-1979-796/annex-II/division-7/division-6/division-6.3.json",
  "legislation": "eudr/1979/796",
  "legislation_title": "First Commission Directive of 26 July 1979 laying down Community methods of analysis for testing certain sugars intended for human consumption (79/796/EEC)",
  "legislation_url": "https://openlegislation.uk/eu-directive-1979-796",
  "path": "annex/II/division/7/division/6/division/6.3",
  "kind": "division",
  "number": "6.3",
  "heading": "Titration by the Luff-Schoorl method",
  "text": "Pipette 25 ml of Luff-Schoorl reagent (4.3) into a 300 ml conical flask (5.1). Pipette 25 ml of the sugar solution (6.2.2) into the conical flask and introduce two pumice chips (4.8). Fit a reflux condenser to the conical flask (5.1) and immediately place the apparatus on an asbestos wire gauze over a Bunsen flame. The gauze shall have a hole cut in the asbestos part of the same diameter as the base of the flask. Heat the liquid to boiling point over a period of about two minutes and simmer gently for exactly 10 minutes. Cool immediately in cold water and after five minutes titrate as follows:\nAdd 10 ml of potassium iodide solution (4.7) then immediately add with caution (because of effervescence) 25 ml of 3 mol/litre sulphuric acid (4.6). Titrate with 01 mol/litre sodium thiosulphate solution (4.4) until the solution is almost colourless, then add a few ml of starch solution (4.5) as indicator and continue titrating until the blue colour disappears.\nCarry out a control test, using 25 ml of water in place of the 25 ml of sugar solution (6.2.2).",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudr/1979/796/annex/II/division/7/division/6/division/6.3",
    "retrieved_at": "2026-11-01T15:23:41.440766+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."
}