{
  "url": "https://openlegislation.uk/eu-regulation-2004-648/annex-VIII/division-1/division-1.6",
  "json_url": "https://openlegislation.uk/eu-regulation-2004-648/annex-VIII/division-1/division-1.6.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/1/division/1.6",
  "kind": "division",
  "number": "1.6",
  "heading": "Checking measuring equipment",
  "text": "The surfactant content (in mg/l) of the synthetic sewage is determined immediately before use.\nThe surfactant content (in mg/l) of the effluent collected over twenty-four hours in vessel F should be determined analytically by the same method, immediately after collection: otherwise the samples must be preserved, preferably by freezing. The concentrations must be determined to the nearest 0,1 mg/l surfactant\nAs a check on the efficiency of the process, the chemical oxygen demand (COD) or the dissolved organic carbon (DOC) of the glass fibre filtered effluent accumulated in vessel F and of the filtered synthetic sewage in vessel A is measured at least twice per week.\nThe reduction in COD or DOC should level off when a roughly regular daily surfactant degradation is obtained at the end of the running-in period shown in Figure 3.\nThe content of dry matter in the activated sludge contained in the aeration vessel should be determined twice a week in g/l. If it is more than 2,5 g/l, the excess activated sludge must be discarded.\nThe degradation test is performed at room temperature; this should be steady and kept between 19-24 ° C.",
  "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/1/division/1.6",
    "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."
}