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Regulations 2, 3 and 4
SCHEDULECRITERIA FOR CLASSIFICATION OF WATERS AS SHELLFISH WATERS
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:
produce a visible film on the surface of the waters and/or a deposit on the shellfish,
have harmful effects on the shellfish
| 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
Silver
Arsenic
Cadmium
Chromium
Copper
Mercury
Nickel
Lead
Zinc
| mg/l
Ag
As
Cd
Cr
Cu
Hg
Ni
Pb
Zn
| 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 |
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