- Draft legislation
This is a draft item of legislation. This draft has since been made as a Scottish Statutory Instrument: The Public Water Supplies (Scotland) Amendment Regulations 2022 No. 387
Regulation 18(4)(c)
Parameter | Uncertainty of measurement (% of prescribed concentration or value, except pH) (Note 1) | Notes |
---|---|---|
Notes— | ||
Note 1: Uncertainty 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 any stricter value. The uncertainty of measurement must be estimated at the level of the parametric value, unless otherwise specified. | ||
Note 2: If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60%). | ||
Note 3: The method determines total cyanide in all forms. | ||
Note 4: The value for the uncertainty of measurement is expressed in pH units. | ||
Note 5: Reference method European standard EN ISO 8467:1995 entitled “ Water quality - Determination of permanganate index (ISO 8467:1993)” (1). | ||
Note 6: The 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. | ||
Note 7: The performance characteristics apply to individual substances, specified at 25% of the prescribed concentration or value for the corresponding parameter in Table B. | ||
Note 8: The performance characteristics apply to individual substances, specified at 50% of the prescribed concentration or value for the corresponding parameter in Table B. | ||
Note 9: The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon in accordance with European standard EN 1484:1997 entitled “ Water analysis - Guidelines for the determination of total organic carbon and dissolved organic carbon” (2). | ||
Note 10: The uncertainty of measurement must be estimated at the level of 1.0 nephelometric turbidity units in accordance with European standard EN ISO 7027-1:2016 entitled “ Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016)” (3) or another equivalent standard method. ” | ||
Aluminium | 25 | |
Ammonium | 40 | |
Acrylamide | 30 | |
Antimony | 40 | |
Arsenic | 30 | |
Benzo(a)pyrene | 50 | Note 2 |
Benzene | 40 | |
Bisphenol A | 50 | |
Boron | 25 | |
Bromate | 40 | |
Cadmium | 25 | |
Chloride | 15 | |
Chlorate | 40 | |
Chlorite | 40 | |
Chromium | 30 | |
Conductivity | 20 | |
Copper | 25 | |
Cyanide | 30 | Note 3 |
1,2-dichloroethane | 40 | |
Epichlorohydrin | 30 | |
Fluoride | 20 | |
HAAs | 50 | |
Hydrogen ion concentration (in pH) | 0.20 | Note 4 |
Iron | 30 | |
Lead | 30 | |
Manganese | 30 | |
Mercury | 30 | |
Microcystin-LR | 30 | |
Nickel | 25 | |
Nitrate | 15 | |
Nitrite | 20 | |
Oxidisability | 50 | Note 5 |
Pesticides | 30 | Note 6 |
PFAS | 50 | |
Polycyclic aromatic hydrocarbons | 40 | Note 7 |
Selenium | 40 | |
Sodium | 15 | |
Sulphate | 15 | |
Tetrachloroethene | 40 | Note 8 |
Trichloroethene | 40 | Note 8 |
Trihalomethanes – total | 40 | Note 7 |
Total organic carbon | 30 | Note 9 |
Turbidity | 30 | Note 10 |
Uranium | 30 | |
Vinyl chloride | 50 |
This standard was approved by the European Committee for Standardization (CEN) on 3rd November 1994. Under reference EN ISO 8467:1995, it is published as a UK standard by the British Standards Institution (ISBN 0 580 23435 5).
This standard has been approved by the International Organization for Standardization (ISO). Under reference BS ISO 5725-1 to BS ISO 5725-6, these are published as UK standards by the British Standards Institution.
This standard was approved by the European Committee for Standardization (CEN) on 15th April 2016. Under reference BS EN ISO 7027-1:2016, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 81961 2).
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Draft Policy Note sets out a brief statement of the purpose of a Draft Scottish Statutory Instrument and provides information about its policy objective and policy implications. They aim to make the Draft Scottish Statutory Instrument accessible to readers who are not legally qualified and accompany any Scottish Statutory Instrument or Draft Scottish Statutory Instrument laid before the Scottish Parliament from July 2012 onwards. Prior to this date these type of notes existed as 'Executive Notes' and accompanied Draft Scottish Statutory Instruments from July 2005 until July 2012.
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