For the parameters set out in Table 1, the specified performance characteristics are that the method of analysis used must, as a minimum, be capable of measuring concentrations equal to the parametric value with a limit of quantification, as defined in Article 2(2) of Commission Directive 2009/90/EC (1) , of 30 % or less of the relevant parametric value and an uncertainty of measurement as specified in Table 1. The result shall be expressed using at least the same number of significant figures as for the parametric value considered in Parts B and C of Annex I.
Until 31 December 2019 Member States may allow for the use of ‘ trueness ’ , ‘ precision ’ and ‘ limit of detection ’ as specified in Table 2, as an alternative set of performance characteristics to ‘ limit of quantification ’ and ‘ uncertainty of measurement ’ as specified respectively in the first paragraph and Table 1.
The uncertainty of measurement laid down in Table 1 shall not be used as an additional tolerance to the parametric values set out in Annex I.
Minimum performance characteristic ‘ Uncertainty of measurement ’
| Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification. | ||
| Parameters | Uncertainty of measurement (See Note 1) % of the parametric value (except for pH) | Notes |
|---|---|---|
| Aluminium | 25 | |
| Ammonium | 40 | |
| Antimony | 40 | |
| Arsenic | 30 | |
| Benzo(a)pyrene | 50 | See Note 5 |
| Benzene | 40 | |
| Boron | 25 | |
| Bromate | 40 | |
| Cadmium | 25 | |
| Chloride | 15 | |
| Chromium | 30 | |
| Conductivity | 20 | |
| Copper | 25 | |
| Cyanide | 30 | See Note 6 |
| 1,2-dichloroethane | 40 | |
| Fluoride | 20 | |
| Hydrogen ion concentration pH (expressed in pH units) | 0,2 | See Note 7 |
| Iron | 30 | |
| Lead | 25 | |
| Manganese | 30 | |
| Mercury | 30 | |
| Nickel | 25 | |
| Nitrate | 15 | |
| Nitrite | 20 | |
| Oxidisability | 50 | See Note 8 |
| Pesticides | 30 | See Note 9 |
| Polycyclic aromatic hydrocarbons | 50 | See Note 10 |
| Selenium | 40 | |
| Sodium | 15 | |
| Sulphate | 15 | |
| Tetrachloroethene | 30 | See Note 11 |
| Trichloroethene | 40 | See Note 11 |
| Trihalomethanes — total | 40 | See Note 10 |
| Total organic carbon (TOC) | 30 | See Note 12 |
| Turbidity | 30 | See Note 13 |
Minimum performance characteristics ‘ Trueness ’ , ‘ precision ’ and ‘ limit of detection ’ — may be used until 31 December 2019
| Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.] | ||||
| Parameters | Trueness (See Note 2) % of the parametric value (except for pH) | Precision (See Note 3) % of the parametric value (except for pH) | Limit of detection (See Note 4) % of the parametric value (except for pH) | Notes |
|---|---|---|---|---|
| Aluminium | 10 | 10 | 10 | |
| Ammonium | 10 | 10 | 10 | |
| Antimony | 25 | 25 | 25 | |
| Arsenic | 10 | 10 | 10 | |
| Benzo(a)pyrene | 25 | 25 | 25 | |
| Benzene | 25 | 25 | 25 | |
| Boron | 10 | 10 | 10 | |
| Bromate | 25 | 25 | 25 | |
| Cadmium | 10 | 10 | 10 | |
| Chloride | 10 | 10 | 10 | |
| Chromium | 10 | 10 | 10 | |
| Conductivity | 10 | 10 | 10 | |
| Copper | 10 | 10 | 10 | |
| Cyanide | 10 | 10 | 10 | See Note 6 |
| 1,2-dichloroethane | 25 | 25 | 10 | |
| Fluoride | 10 | 10 | 10 | |
| Hydrogen ion concentration pH (expressed in pH units) | 0,2 | 0,2 | See Note 7 | |
| Iron | 10 | 10 | 10 | |
| Lead | 10 | 10 | 10 | |
| Manganese | 10 | 10 | 10 | |
| Mercury | 20 | 10 | 20 | |
| Nickel | 10 | 10 | 10 | |
| Nitrate | 10 | 10 | 10 | |
| Nitrite | 10 | 10 | 10 | |
| Oxidisability | 25 | 25 | 10 | See Note 8 |
| Pesticides | 25 | 25 | 25 | See Note 9 |
| Polycyclic aromatic hydrocarbons | 25 | 25 | 25 | See Note 10 |
| Selenium | 10 | 10 | 10 | |
| Sodium | 10 | 10 | 10 | |
| Sulphate | 10 | 10 | 10 | |
| Tetrachloroethene | 25 | 25 | 10 | See Note 11 |
| Trichloroethene | 25 | 25 | 10 | See Note 11 |
| Trihalomethanes — total | 25 | 25 | 10 | See Note 10 |
| Turbidity | 25 | 25 | 25 | |
| 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 better. Measurement uncertainty shall be estimated at the level of the parametric value, unless otherwise specified. |
| Note 2 | Trueness 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. |
| Note 3 | Precision 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. |
| Note 4 | Limit of detection is either:
|
| Note 5 | If the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60 %). |
| Note 6 | The method determines total cyanide in all forms. |
| Note 7 | Values for trueness, precision and uncertainty of measurement are expressed in pH units. |
| Note 8 | Reference method: EN ISO 8467 |
| Note 9 | 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 10 | The performance characteristics apply to individual substances, specified at 25 % of the parametric value in Part B of Annex I. |
| Note 11 | The performance characteristics apply to individual substances, specified at 50 % of the parametric value in Part B of Annex I. |
| Note 12 | The 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. |
| Note 13 | The uncertainty of measurement should be estimated at the level of 1,0 NTU (nephelometric turbidity units) in accordance with EN ISO 7027.] |
Textual Amendments
[F1Commission Directive 2009/90/EC of 31 July 2009 laying down, pursuant to Directive 2000/60/EC of the European Parliament and of the Council, technical specifications for chemical analysis and monitoring of water status ( OJ L 201, 1.8.2009, p. 36 ).]