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Changes over time for:
Table A1
Timeline of Changes
This timeline shows the different points in time where a change occurred. The dates will coincide with the earliest date on which the change (e.g an insertion, a repeal or a substitution) that was applied came into force. The first date in the timeline will usually be the earliest date when the provision came into force. In some cases the first date is 01/02/1991 (or for Northern Ireland legislation 01/01/2006). This date is our basedate. No versions before this date are available. For further information see the Editorial Practice Guide and Glossary under Help.
Version Superseded: 15/06/2018
Status:
Point in time view as at 31/03/2017.
Changes to legislation:
There are currently no known outstanding effects for the The Water Supply (Water Quality) Regulations 2010 (revoked),
Table A1
.
Changes to Legislation
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Regulation 16
Table A1 E+WParameters for which, Subject to Regulation 16(7), Methods of Analysis are Prescribed
(1) | (2) |
---|
Parameter | Method |
---|
Clostridium perfringens (including spores) | Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar* 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. |
Coliform bacteria | ISO 9308-1 |
Colony count 22°C-enumeration of culturable microorganisms | prEN ISO 6222 |
Colony count 37°C-enumeration of culturable microorganisms | prEN ISO 6222 |
Enterococci | ISO 7899-2 |
Escherichia coli (E coli) | ISO 9308-1 |
*The composition of m-CP agar is: | |
Basal medium | |
Tryptose | 30.0g |
Yeast extract | 20.0g |
Sucrose | 5.0g |
L-cysteine hydrochloride | 1.0g |
MgSO4·7H2O | 0.1g |
Bromocresol purple | 40.0mg |
Agar | 15.0g |
Water | 1,000.0ml |
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 | 400.0mg |
Polymyxine-B sulphate | 25.0mg |
Indoxyl-[beta]-D-glucoside to be dissolved in 8 ml sterile water before addition | 60.0mg |
Filter-sterilised 0.5% phenolphthalein diphosphate solution | 20.0 ml |
Filter-sterilised 4.5% FeCl3·6H2O | 2.0 ml |
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