{
  "url": "https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-1992/schedule",
  "json_url": "https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-1992/schedule.json",
  "legislation": "uksi/1992/337",
  "legislation_title": "The Surface Waters (Dangerous Substances) (Classification) Regulations 1992",
  "legislation_url": "https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-1992",
  "path": "schedule",
  "kind": "schedule",
  "number": "THE",
  "heading": "CLASSIFICATION OF RELEVANT TERRITORIAL WATERS, COASTAL WATERS AND INLAND FRESHWATERS (DS3)",
  "text": "(1)\n(2)\n(3)\nSubstance\nConcentration in microgrammes per litre (annual mean)\nReference method of measurement\nNote\nThe accuracy and precision of the method must be plus or minus 50% at a concentration which represents twice the value of the limit of determination.\n1,2-Dichloroethane\n10\nGas chromatography with electron capture detection after extractionby means of an appropriate solvent or gas chromatography following isolation by means of the “purge and trap” process and trapping by using a cryogenically cooled capillary trap. The limit of determination is 1μg/l. ( see Note )\nTrichloroethylene\n10\nGas chromatography with electron capture detection after extractionby means of an appropriate solvent. The limit of determination is 0.1μg/l. ( see Note )\nPerchloroethylene\n10\nTrichlorobenzene\n0.4 (but there must be no significant increase over time in the concentration of trichlorobenzene in sediments and/or molluscs and/or shellfish and/or fish).\nGas chromatography with electron capture detection after extraction by means of an appropriate solvent or, when used to determine the concentration in sediments and organisms, after appropriate preparation of the sample. The limit of determination for each isomer separately is 10 ng/l for the water environment and 1μg/kg of dry matter for sediments and organisms. ( see Note )",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1992/337/schedule",
    "retrieved_at": "2026-10-29T14:29:00.449885+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."
}