{
  "url": "https://openlegislation.uk/eu-regulation-2004-648/annex-VIII/division-3/division-3.1",
  "json_url": "https://openlegislation.uk/eu-regulation-2004-648/annex-VIII/division-3/division-3.1.json",
  "legislation": "eur/2004/648",
  "legislation_title": "Regulation (EC) No 648/2004 of the European Parliament and of the Council of 31 March 2004 on detergents (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2004-648",
  "path": "annex/VIII/division/3/division/3.1",
  "kind": "division",
  "number": "3.1",
  "heading": "Principle",
  "text": "Surface active agents are concentrated and isolated by gas stripping. In the sample used, the quantity of non-ionic surfactant should be in the range 250-800 g.\nThe stripped surfactant is dissolved in ethyl acetate.\nAfter phase separation and evaporation of the solvent, the non-ionic surfactant is precipitated in aqueous solution with modified Dragendorff reagent (KBiI4 + BaCl2 + glacial acetic acid).\nThe precipitate is filtered, washed with glacial acetic acid and dissolved in ammonium tartrate solution. The bismuth in the solution is titrated potentiometrically with pyrrolidinedithiocarbamate solution at pH 4-5 using a bright platinum indicator electrode and a calomel or silver/silver chloride reference electrode. The method is applicable to non-ionic surfactants containing 6-30 alkylene oxide groups.\nThe titration result is multiplied by the empirical factor of 54 for conversion to the reference substance nonylphenol condensed with 10 mols ethylene oxide (NP 10).",
  "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/eur/2004/648/annex/VIII/division/3/division/3.1",
    "retrieved_at": "2026-11-01T14:55:38.850310+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."
}