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.
[F1The 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 by the Commission of further CEN/ISO international methods for those parameters. Member States may use alternative methods, providing the provisions of Article 7(5) are met.
Textual Amendments
F1 Substituted by Regulation (EC) No 596/2009 of the European Parliament and of the Council of 18 June 2009 adapting a number of instruments subject to the procedure referred to in Article 251 of the Treaty to Council Decision 1999/468/EC with regard to the regulatory procedure with scrutiny Adaptation to the regulatory procedure with scrutiny — Part Four.
Those measures on further CEN/ISO international methods, designed to amend non-essential elements of this Directive, inter alia , by supplementing it, shall be adopted in accordance with the regulatory procedure with scrutiny referred to in Article 12(3).]
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.
The composition of m-CP agar is:U.K.
Basal medium
| Tryptose | 30 g |
| Yeast extract | 20 g |
| Sucrose | 5 g |
| L-cysteine hydrochloride | 1 g |
| MgSO4 · 7H2O | 0,1 g |
| Bromocresol purple | 40 mg |
| Agar | 15 g |
| Water | 1 000 ml |
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:
| D-cycloserine | 400 mg |
| Polymyxine-B sulphate | 25 mg |
| Indoxyl-β-D-glucoside to be dissolved in 8 ml sterile water before addition | 60 mg |
| Filter — sterilised 0,5 % phenolphthalein diphosphate solution | 20 ml |
| Filter — sterilised 4,5 % FeCl3 · 6H2O | 2 ml |
| Parameters | Trueness % of parametric value(Note 1) | Precision % of parametric value(Note 2) | Limit of detection % of parametric value(Note 3) | Conditions | Notes |
|---|---|---|---|---|---|
| Acrylamide | To be controlled by product specification | ||||
| 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 | Note 4 | |
| 1,2-dichloroethane | 25 | 25 | 10 | ||
| Epichlorohydrin | To be controlled by product specification | ||||
| Fluoride | 10 | 10 | 10 | ||
| 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 | Note 5 | |
| Pesticides | 25 | 25 | 25 | Note 6 | |
| Polycyclic aromatic hydrocarbons | 25 | 25 | 25 | Note 7 | |
| Selenium | 10 | 10 | 10 | ||
| Sodium | 10 | 10 | 10 | ||
| Sulphate | 10 | 10 | 10 | ||
| Tetrachloroethene | 25 | 25 | 10 | Note 8 | |
| Trichloroethene | 25 | 25 | 10 | Note 8 | |
| Trihalomethanes — Total | 25 | 25 | 10 | Note 7 | |
| Vinyl chloride | To be controlled by product specification |
| a These terms are further defined in ISO 5725. | |
| Note 1 a: | 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 a: | 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:
|
| 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. |
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. |