The Water Supply (Water Quality) (Scotland) Regulations 2000
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Regulation 16
SCHEDULE 4
ANALYTICAL METHODOLOGY
TABLE A1
Parameters for which, subject to regulation 16(5), 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
|
pr EN 6222
|
|
Enterocci
|
ISO 7899-2
|
|
Escherichia coli (E. coli)
|
ISO 9308-1
|
*The composition of m-CP agar is:
|
Basal medimum
|
|
| |
|
|
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-B-D-glucoside
|
60.0mg
|
|
to be dissolved in 8ml sterile water
|
|
|
before addition
|
|
|
Filter — sterilised 0.5% phenolphthalein
|
|
|
disphosphate solution
|
20.0ml
|
|
Filter — sterilised 4.5% FeC13 —
6H2O
|
2.0ml
|
TABLE A2
Parameters in relation to which, subject to regulation 16(5),
methods of analysis must satisfy prescribed characteristics
|
(1)
Parameters
|
(2)
Trueness % of prescribed concentration or value
|
(3)
Precision % of prescribed concentration or value
|
(4)
Limit of detection % of prescribed concentration or value
|
|
Aluminium
|
10
|
10
|
10
|
|
Ammonium
|
10
|
10
|
10
|
|
Antimony
|
25
|
25
|
25
|
|
Arsenic
|
10
|
10
|
10
|
|
Benzene
|
25
|
25
|
25
|
|
Benzo(a)pyrene
|
25
|
25
|
25
|
|
Boron
|
10
|
10
|
10
|
|
Bromate
|
25
|
25
|
25
|
|
Cadmium
|
10
|
10
|
10
|
|
Chloride
|
10
|
10
|
10
|
|
Chromium
|
10
|
10
|
10
|
|
Conductivity
|
10
|
10
|
10
|
|
Copper
|
10
|
10
|
10
|
|
Cyanide(i)
|
10
|
10
|
10
|
|
1,2-dichloroethane
|
25
|
25
|
10
|
|
Fluoride
|
10
|
10
|
10
|
|
Iron
|
10
|
10
|
10
|
|
Lead
|
10
|
10
|
10
|
|
Manganese
|
10
|
10
|
10
|
|
Mercury
|
20
|
10
|
20
|
|
Nickel
|
10
|
10
|
10
|
|
Nitrate
|
10
|
10
|
10
|
|
Nitrite
|
10
|
10
|
10
|
|
Pesticides [and related products](ii)
|
25
|
25
|
25
|
|
Polycyclic aromatic hydrocarbons(iii)
|
25
|
25
|
25
|
|
Selenium
|
10
|
10
|
10
|
|
Sodium
|
10
|
10
|
10
|
|
Sulphate
|
10
|
10
|
10
|
|
Tetrachloroethene(iv)
|
25
|
25
|
10
|
|
Trichloroethene(iv)
|
25
|
25
|
10
|
|
Trihalomethanes: Total(iii)
|
25
|
10
|
10
|
Notes:
(i) The method of analysis should determine total
cyanide in all forms.
(ii) The performance characteristics apply to each
individual pesticide and will depend on the pesticide concerned.
(iii) The performance characteristics apply to the
individual substances specified at 25% of the parametric value in Part I of
Table B in Schedule 1.
(iv) The performance characteristics apply to the
individual substances specified at 50% of the parametric value in Part I of
Table B in Schedule 1.
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