(3)

point 2 is amended as follows: (a) the heading of point 2 is replaced by the following: ‘PART B Chemical and indicator parameters for which performance characteristics are specified’ (b) point 2.1 is replaced by the following: ‘1. Chemical and indicator parameters 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. Table 1 Minimum performance characteristic “Uncertainty of measurement” 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 Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.

Table 2 Minimum performance characteristics “Trueness”, “precision” and “limit of detection” — may be used until 31 December 2019 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 Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification. (1) Commission 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).’" (c) point 2.2 is replaced by the following: ‘2. Notes to Tables 1 and 2 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: — three times the standard deviation within a batch of a natural sample containing a low concentration of the parameter, or — five times the standard deviation of a blank sample (within a batch). 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.’