- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Gwreiddiol (a wnaed Fel)
Dyma’r fersiwn wreiddiol (fel y’i gwnaed yn wreiddiol). This item of legislation is currently only available in its original format.
Regulation 2(3)
Parameter | Parametric value | Minimum sampling frequency | Methods of analysis and inspection |
---|---|---|---|
Notes 1. Samples may be taken at intervals of four weeks where samples taken in previous years show that the waters are of an appreciably higher standard than that required for the classification in question and the quality of the waters has not subsequently deteriorated and is unlikely to do so. 2. Samples must be taken in relation to this parameter when there are grounds for suspecting that there has been a deterioration in the quality of the waters or the substance is likely to be present in the waters. | |||
Micro-biological: | |||
Total coliforms | 10,000/100ml | Fortnightly (see Note 1) | Fermentation in multiple tubes. Sub-culturing of the positive tubes on a confirmation medium. Either counting according to MPN (most probable number) or membrane filtration, culturing on an appropriate medium, sub-culturing and identification of the suspect colonies. |
Faecal coliforms | 2,000/100ml | Fortnightly (see Note 1) | The incubation temperature is variable according to whether total or faecal coliforms are being investigated. |
Salmonella | Absent in 1 litre | (see Note 2) | Membrane filtration, culturing on an appropriate medium, sub-culturing and identification of the suspect colonies. |
Entero viruses | No plaque forming units in 10 litres | (see Note 2) | Concentration (by filtration, flocculation or centrifuging) and confirmation. |
Physico-chemical: | |||
PH | 6 to 9 | (see Note 2) | Electrometry with calibration at pH 7 and 9. |
Colour | No abnormal change in colour | Fortnightly (see Note 1) | Visual inspection or photometry with standards on the platinum cobalt scale. |
Mineral oils | No film visible on the surface of the water and no odour | Fortnightly (see Note 1) | Visual and olfactory inspection. |
Surface-active substances reacting with methylene blue | No lasting foam | Fortnightly (see Note 1) | Visual inspection. |
Phenols (phenol indices) | No specific odour | Fortnightly (see Note 1) | Olfactory inspection. |
≤0.05 mg/litre (C6H5OH) | (see Note 2) | Absorption spectrophotometry 4-aminoantipyrine (4 AAP) | |
Transparency | 1 metre | Fortnightly (see Note 1) | Secchi’s disc. |
Y Diweddaraf sydd Ar Gael (diwygiedig):Y fersiwn ddiweddaraf sydd ar gael o’r ddeddfwriaeth yn cynnwys newidiadau a wnaed gan ddeddfwriaeth ddilynol ac wedi eu gweithredu gan ein tîm golygyddol. Gellir gweld y newidiadau nad ydym wedi eu gweithredu i’r testun eto yn yr ardal ‘Newidiadau i Ddeddfwriaeth’.
Gwreiddiol (Fel y’i Deddfwyd neu y’i Gwnaed): Mae'r wreiddiol fersiwn y ddeddfwriaeth fel ag yr oedd pan gafodd ei deddfu neu eu gwneud. Ni wnaed unrhyw newidiadau i’r testun.
Gallwch wneud defnydd o ddogfennau atodol hanfodol a gwybodaeth ar gyfer yr eitem ddeddfwriaeth o’r tab hwn. Yn ddibynnol ar yr eitem ddeddfwriaeth sydd i’w gweld, gallai hyn gynnwys: