Regulations 2, 3 and 4
| No. in Annex to 79/923/EEC | Parameter | Units | Requirements to be satisfied | Reference methods of analysis | Minimum sampling and measuring frequency |
|---|---|---|---|---|---|
| 1 | pH | pH unit | ≥7 and ≤9 | Electrometry Measured in situ at the time of sampling | Quarterly |
| 3 | Coloration (after filtration) | mg Pt/l | A discharge affecting shellfish waters must not cause the colour of the waters after filtration to deviate by more than 10 mg Pt/l from the colour of waters not so affected | Filter through a 0.45 μm membrane Photometric method, using the platinum/cobalt scale | Quarterly |
| 4 | Suspended solids | mg/l | A discharge affecting shellfish waters must not cause the suspended solid content of the waters to exceed by more than 30% the content of waters not so affected | Filtration through a 0.45 μm membrane, drying at 105°C and weighing Centrifuging (for at least five minutes, with mean acceleration 2,800 to 3,200g), drying at 105°C and weighing | Quarterly |
| 5 | Salinity | ‰ | ≤40‰ A discharge affecting shellfish waters must not cause their salinity to exceed by more than 10% the salinity of waters not so affected | Conductimetry | Monthly |
| 6 | Dissolved oxygen | Saturation % | ≥70% (average value) If an individual measurement indicates a value lower than 70%, measurements shall be repeated An individual measurement may not indicate a value lower than 60% unless there are no harmful consequences for the development of shellfish colonies | Winkler’s method Electrochemical method | Monthly, with a minimum of one sample representative of low oxygen conditions on the day of sampling. However, where major daily variations are suspected, a minimum of two samples in one day shall be taken. |
| 7 | Petroleum hydrocarbons | Hydrocarbons must not be present in the shellfish waters in such quantities as to:
| Visual examination | Quarterly | |
| 8 | Organo-halogenated substances | The concentration of each substance in the shellfish waters or in shellfish flesh must not reach or exceed a level which has harmful effects on the shellfish and their larvae | Gas chromatography after extraction with suitable solvents and purification | Half-yearly | |
| 9 | Metals
| mg/l
| The concentration of each substance in the shellfish waters or in the shellfish flesh must not reach or exceed a level which has harmful effects on the shellfish and their larvae The synergic effects of these metals must be taken into consideration | Spectrometry of atomic absorption preceded, where appropriate, by concentration and/or extraction | Half-yearly |
| 11 | Substances affecting the taste of the shellfish | Concentration should be lower than that which is liable to impair the taste of the shellfish | Examination of the shellfish by tasting where the presence of one of these substances is presumed |