Schedule 2 Guideline values in relation to the quality of shellfish watersI1
Northern Ireland Not yet in force
| No in Annex 1 to 79/923/EEC | Parameter | Units | Guideline values and comments | Reference methods of analysis | Minimum sampling and measuring frequency |
|---|---|---|---|---|---|
| 2. | Temperature | °C | A discharge affecting shellfish waters must not cause the temperature of the water to exceed by more than 2°C the temperature of waters not so affected | — Thermometry Measured in situ at the time of sampling | Quarterly |
| 5. | Salinity | ‰ | 12 to 38‰ | Conductivity | Monthly |
| 6. | Dissolved oxygen | saturation % | ≥80% |
| Monthly, with a minimum of 1 sample representative of low oxygen conditions on the day of sampling. However, where major daily variations are suspected, a minimum of 2 samples in 1 day shall be taken |
| 8. | Organohalo- genated substances | The concentration of each substance in shellfish flesh must be so limited that in contributes, in accordance with Article 1 of Directive 79/923/EEC, to the high quality of shellfish products | Gas chromatography after extraction with suitable solvents and purification | Half-yearly | |
| 9. | Metals
| mg/1 | The concentration of each substance in shellfish flesh must be so limited that it contributes in accordance with Article 1 of Directive 79/923/EEC, to the high quality of shellfish products | Spectrometry of atomic absorption preceded, where appropriate, by concentration and/or extraction | Half-yearly |
| 10. | Faecal coliforms | ≤300 in the shellfish flesh and intervalvular liquid | Method of dilution with fermentation in liquid substrates in at least 3 tubes in 3 dilutions. Subculturing of the positive tubes on a confirmation medium. Count according to MPN (most probable number). Incubation temperature 44° ± 0.5°C | Quarterly |
Annotations
Commencement
- I1
Sch. 2 in operation at 5.1.1998, see reg. 1