{
  "url": "https://openlegislation.uk/eu-directive-1985-490/annex/division-3/division-B/division-4/division-4.10",
  "json_url": "https://openlegislation.uk/eu-directive-1985-490/annex/division-3/division-B/division-4/division-4.10.json",
  "legislation": "eudr/1985/490",
  "legislation_title": "Fourth Commission Directive of 11 October 1985 on the approximation of the laws of the Member States relating to methods of analysis necessary for checking the composition of cosmetic products (85/490/EEC)",
  "legislation_url": "https://openlegislation.uk/eu-directive-1985-490",
  "path": "annex/division/3/division/B/division/4/division/4.10",
  "kind": "division",
  "number": "4.10",
  "heading": "Eluant: orthophosphoric acid (4.7) /potassium dihydrogenorthophosphate (4.8) /tetramethylammonium bromide (4.9)/water/acetonitrile (4.1) 10/50/100/340/90 (v/v/v/v/v).",
  "text": "The composition of this mobile phase may be changed in order to achieve a resolution factor R ≥ 1,5.\nR = 2 d'R 2 — d'R 1 W 1 + W 2 where\nR1 and R2 retention times, in minutes, of the peaks,\nW1 and W2 peak widths at half height, in millimetres,\nd' the chart speed, in millimetres per minute.",
  "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/1985/490/annex/division/3/division/B/division/4/division/4.10",
    "retrieved_at": "2026-11-01T15:23:35.079616+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."
}