{
  "url": "https://openlegislation.uk/eu-directive-1998-83/annex-III/part-B/division-2",
  "json_url": "https://openlegislation.uk/eu-directive-1998-83/annex-III/part-B/division-2.json",
  "legislation": "eudr/1998/83",
  "legislation_title": "Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption",
  "legislation_url": "https://openlegislation.uk/eu-directive-1998-83",
  "path": "annex/III/part/B/division/2",
  "kind": "division",
  "number": "2",
  "heading": "Notes to Tables 1 and 2",
  "text": "Note 1\nUncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or better. Measurement uncertainty shall be estimated at the level of the parametric value, unless otherwise specified.\nNote 2\nTrueness is a measure of systematic error, i.e. the difference between the mean value of the large number of repeated measurements and the true value. Further specifications are those set out in ISO 5725.\nNote 3\nPrecision is a measure of random error and is usually expressed as the standard deviation (within and between batches) of the spread of results from the mean. Acceptable precision is twice the relative standard deviation. This term is further specified in ISO 5725.\nNote 4\nLimit of detection is either:\nthree times the standard deviation within a batch of a natural sample containing a low concentration of the parameter, or\nfive times the standard deviation of a blank sample (within a batch).\nNote 5\nIf the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60 %).\nNote 6\nThe method determines total cyanide in all forms.\nNote 7\nValues for trueness, precision and uncertainty of measurement are expressed in pH units.\nNote 8\nReference method: EN ISO 8467\nNote 9\nThe performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80 % may be allowed for a number of pesticides.\nNote 10\nThe performance characteristics apply to individual substances, specified at 25 % of the parametric value in Part B of Annex I.\nNote 11\nThe performance characteristics apply to individual substances, specified at 50 % of the parametric value in Part B of Annex I.\nNote 12\nThe uncertainty of measurement should be estimated at the level of 3 mg/l of the total organic carbon (TOC). CEN 1484 Guidelines for the determination of TOC and dissolved organic carbon (DOC) shall be used.\nNote 13\nThe uncertainty of measurement should be estimated at the level of 1,0 NTU (nephelometric turbidity units) in accordance with EN ISO 7027.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Directive (EU) 2015/1787 of 6 October 2015 amending Annexes II and III to Council Directive 98/83/EC on the quality of water intended for human consumption."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudr/1998/83/annex/III/part/B/division/2",
    "retrieved_at": "2026-11-01T15:23:05.963553+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."
}