ANNEX III

SPECIFICATIONS FOR THE ANALYSIS OF PARAMETERS Each Member State must ensure that any laboratory at which samples are analysed has a system of analytical quality control that is subject from time to time to checking by a person who is not under the control of the laboratory and who is approved by the competent authority for that purpose. 1. PARAMETERS FOR WHICH METHODS OF ANALYSIS ARE SPECIFIED The following principles for methods of microbiological parameters are given either for reference whenever a CEN/ISO method is given or for guidance, pending the possible future adoption, in accordance with the procedure laid down in Article 12, of further CEN/ISO international methods for these parameters. Member States may use alternative methods, providing the provisions of Article 7(5) are met. Coliform bacteria and Escherichia coli (E. coli) (ISO 9308-1) Enterococci (ISO 7899-2) Pseudomonas aeruginosa (prEN ISO 12780) Enumeration of culturable microorganisms - Colony count 22 °C (prEN ISO 6222) Enumeration of culturable microorganisms - Colony count 37 °C (prEN ISO 6222) Clostridium perfringens (including spores) Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar (Note 1) at 44 ± 1 °C for 21 ± 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds. Note 1: The composition of m-CP agar is: >TABLE> Dissolve the ingredients of the basal medium, adjust pH to 7,6 and autoclave at 121 °C for 15 minutes. Allow the medium to cool and add: >TABLE> 2. PARAMETERS FOR WHICH PERFORMANCE CHARACTERISTICS ARE SPECIFIED 2.1. For the following parameters, 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 trueness, precision and limit of detection specified. Whatever the sensitivity of the method of analysis used, the result must be expressed using at least the same number of decimals as for the parametric value considered in Annex I, Parts B and C. >TABLE> 2.2. For hydrogen ion concentration the specified performance characteristics are that the method of analysis used must be capable of measuring concentrations equal to the parametric value with a trueness of 0,2 pH unit and a precision of 0,2 pH unit. Note 1 (1*): Trueness is the systematic error and is the difference between the mean value of the large number of repeated measurements and the true value. Note 2 (2*): Precision is the random error and is usually expressed as the standard deviation (within and between batch) of the spread of results about the mean. Acceptable precision is twice the relative standard deviation. Note 3: Limit of detection is either: three times the relative within batch standard deviation of a natural sample containing a low concentration of the parameter, or five times the relative within batch standard deviation of a blank sample. Note 4: The method should determine total cyanide in all forms. Note 5: Oxidation should be carried out for 10 minutes at 100 °C under acid conditions using permanganate. Note 6: The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. The limit of detection may not be achievable for all pesticides at present, but Member States should strive to achieve this standard. Note 7: The performance characteristics apply to the individual substances specified at 25 % of the parametric value in Annex I. Note 8: The performance characteristics apply to the individual substances specified at 50 % of the parametric value in Annex I. 3. PARAMETERS FOR WHICH NO METHOD OF ANALYSIS IS SPECIFIED Colour Odour Taste Total organic carbon Turbidity (Note 1) Note 1: For turbidity monitoring in treated surface water 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 trueness of 25 %, precision of 25 % and a 25 % limit of detection. (1*) These terms are further defined in ISO 5725.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.