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The Surface Waters (Abstraction for Drinking Water) (Classification) Regulations (Northern Ireland) 1996

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regulation 8

SCHEDULE 2

Part IMethod of Measuring the Values of Parameters

No. in Annex 1 to 79/869 /EECParametersLimit of detection1Precision2Accuracy3Method of measurementMaterials recommended for the container
1

“Limit of detection” means the minimum value of the parameter examined which it is possible to detect.

2

“Precision” means the range within which 95% of the results of measurements made on a single sample, using the same method, are located.

3

“Accuracy” means the difference between the true value of the parameter examined and the average experimental value obtained.

4

For values in the column of Category DW1 in Schedule 1.

5

For waters classified as DW2 or DW3.

6

For waters classified as DW3.

7

For values in the I columns of Schedule 1.

8

For values in the I column of Category DWI, and values in Category DW3 in Schedule 1.

9

For values in the G columns of Categories DW2 and DW3 in Schedule 1

10

Mixture of six standard substances all of the same concentration to be taken into consideration: fluoranthene; 3, 4-benzofluoranthene; 11, 12-benzofluoranthene; 3, 4-benzopyrene; 1, 12 benzoperylene; indano/1, 2, 3-cd/pyrene.

11

Mixture of three substances all of the same concentration to be taken into consideration; parathion, hexachlorocyclohexane, dieldrin.

12

If the samples contain so much suspended matter as to require special preliminary treatment, the accuracy values shown in the above Table may as an exception be exceeded and are to be regarded as a target. The samples must be treated so as to ensure that the analysis covers the largest quantity of substances to be measured.

13

As this method is not in current use in all Member States it is not certain that the limit of detection required for checking values can be attained.

14

Absence in this volume for values in the G column of Category DW1 in Schedule 1.

15

Absence in this volume for values in the G column of Category DW2 in Schedule 1.

1pHpH unit0.10.2Electrometry, measured in situ at the time of sampling without prior treatment of the sample.
2Coloration (after simple filtration)mg/l Pt Scale510%20%Filtering through a glass fibre membrane. Photometric method using platinum-cobalt scale.
3Total suspended solidsmg/l SS5%10%Filtering through a 0.45 μm filter membrane, drying at 105°C and weighing. Centrifuging (for at least 5 mins with mean acceleration of 2,800 to 3,200 g), drying at 105°C and weighing.
4Temperature°C0.51Thermometry. Measured in situ at the time of sampling without prior treatment of the sample.
5Conductivity at 20°Cμs/cm5%10%Electrometry.
6Odour(dilution factor at 25°C)By successive dilutions.Glass.
7Nitratesmg/l NO3210%20%Molecular absorption spectrophotometry.
8Fluoridesmg/l F0.0510%20%Molecular absorption spectrophotometry after distillation if necessary. Ion selective electrodes.
10Dissolved ironmg/1 Fe0.0210%20%Atomic absorption spectrophotometry after filtering through a filter membrane (0.45 μm). Molecular absorption spectrophotometry after filtering through a 0.45 μm filter membrane.
11Manganesemg/l Mn

0.014

0.025

10%4

10%5

20%4

20%5

Atomic absorption spectrophotometry.

Atomic absorption spectrophotometry. Molecular absorption spectrophotometry.

12Copper12mg/l Cu

0.005

0.026

10%

10%6

20%

20%6

Atomic absorption spectrophotometry. Polarography.

Atomic absorption spectrophotometry. Molecular absorption spectrophotometry. Polarography.

13Zinc12mg/l Zn

0.014

0.02

10%4

10%

20%4

20%

Atomic absorption spectrophotometry.

Atomic absorption spectrophotometry. Molecular absorption spectrophotometry.

14Boron12mg/l B0.110%20%Molecular absorption spectrophotometry. Atomic absorption spectrophotometry.Materials not containing boron in any significant quantities.
19Arsenic12mg/l As

0.0024

0.017

20%4

10%7

20%4

20%7

Atomic absorption spectrophotometry.

Atomic absorption spectrophotometry. Molecular absorption spectrophotometry.

20Cadmium12mg/l Cd

0.0002

0.0017

30%30%Atomic absorption spectrophotometry. Polarography.
21Total chromium12mg/l Cr0.0120%30%Atomic absorption spectrophotometry. Molecular absorption spectrophotometry.
22Lead12mg/1 Pb0.0120%30%Atomic absorption spectrophotometry. Polarography.
23Selenium12mg/l Se0.00510%10%Atomic absorption spectrophotometry.
24Mercury12mg/l Hg

0.0001

0.00027

30%30%Flameless atomic absorption spectrophotometry (cold vaporisation).
25Barium12mg/l Ba0.0215%30%Atomic absorption spectrophotometry.
26Cyanidemg/l CN0.0120%30%Molecular absorption spectrophotometry.
27Sulphatesmg/l SO41010%10%Gravimetric analysis. EDTA compleximetry. Molecular absorption spectrophotometry.
28Chloridesmg/l Cl1010%10%Titration (Mohr’s method). Molecular absorption spectrophotometry.
29Surfactants (reacting with methylene blue)mg/l (lauryl sulphate0.0520%Molecular absorption spectrophotometry.
30Phosphatesmg/l P2O50.0210%20%Molecular absorption spectrophotometry.
31Phenols (phenol index) parani-traniline 4 amino-antipyrenemg/l C6H5OH

0.0005

0.0018

0.0005

30%

0.0005

50%

Molecular absorption spectrophotometry. 4 aminoantipyrine method. Paranitraniline method.Glass.
32Dissolved or emulsified hydro- carbons (after extraction by petroleum ether)mg/l

0.01

0.045

20%

20%5

30%

30%5

Infra-red spectrometry after extraction by carbon tetrachloride. Gravimetry after extraction by petroleum ether.Glass.
33Polycyclic aromatic hydro-carbons12mg/l0.0000450%50%Measurement of fluorescence in the UV after thin layer chromatography. Comparative measurements in relation to a mixture of six control substances with the same concentration.10Glass or aluminium.
34Total pesticides (parathion, hexachloro- cyclohexane, dieldrin)12mg/l0.000150%50%Gas or liquid chromatography after extraction by suitable solvents and purification. Identification of the constituents of the mixture. Quantitative analysis.11Glass.
35Chemical oxygen demand (COD)mg/l O21520%20%Potassium dichromate method.
36Dissolved oxygen saturation rate% O2510%10%Winkler’s method. Electro-chemical method.Glass.
37Biochemical oxygen demand (BOD5) (at 20°C without nitrification)mg/l O221.52Determination of dissolved oxygen before and after five day incubation at 20°C ± 1°C in complete darkness. Addition of a nitrification inhibitor.
38Nitrogen, Kjeldahl method (except NO2 or NO3)mg/l N0.30.50.5Mineralisation, distillation by the Kjeldahl method and ammonium determination by means of molecular absorption spectrophotometry or titration.
39Ammoniummg/l NH4

0.014

0.15

0.034

10%5

0.034

20%5

Molecular absorption spectrophotometry.
40Substances extractable with chloroformmg/l(13)Extraction at neutral pH value by purified chloroform, evaporation in vacuo at room temperature, weighing of residue.
43Total coliforms/100 ml

54

5009

Culture at 37°C on an appropriate specific solid medium (such as Tergitol lactose agar, Endo agar, 0.4% Teepol broth) with filtration4 or without filtration9 and colony count. Samples must be diluted or, where appropriate, concentrated in such a way as to contain between 10 and 100 colonies. If necessary, identification by gasification.

Alternative method:— Method of dilution with fermentation in liquid substrates in at least three tubes in three dilutions. Sub-culturing of the positive tubes on a confirmation medium. Count according to MPN (most probable number). Incubation temperature 37°C ± 1°C.

Sterilised glass.
44Faecal coliforms/100 ml

24

2009

Culture at 44°C on an appropriate specific solid medium (such as Tergitol lactose agar, Endo agar, 0.4% Teepol broth) with filtration4 or without filtration9 and colony count. Samples must be diluted or, where appropriate, concentrated in such a way as to contain between 10 and 100 colonies. If necessary, identification by gasification.

Alternative method:— Method of dilution with fermentation in liquid substrates in at least three tubes in three dilutions. Sub-culturing of the positive tubes on a confirmation medium. Count according to MPN (most probable number). Incubation temperature 44°C ± 0.5°C.

Sterilised glass.
45Faecal streptococci/100 ml

24

2009

Culture at 37°C on an appropriate specific solid medium (such as sodium azide) with filtration4 or without filtration9 and colony count. Samples must be diluted or, where appropriate, concentrated in such a way as to contain between 10 and 100 colonies.

Alternative method:— Method of dilution in sodium azide broth in at least three tubes in three dilutions. Count according to MPN (most probable number.

46Salmonella

1/5,000 ml14

1/1,000 ml15

Concentration by filtration (on membrane or appropriate filter). Inoculation into pre-enrichment medium. Enrichment and transfer into isolating gelese. Identification.Sterilised glass.

Part IIMinimum Annual Frequency of Sampling for each Parameter

Population ServedClassification DW1Classification DW2Classification DW3
I1II2III3I1II2III3I1II2III3
1

This column applies to the parameters −pH, coloration, total suspended solids, temperature, conductivity, odour, nitrates, chlorides, phosphates, chemical oxygen demand (COD), dissolved oxygen saturation rate, biochemical oxygen demand (BOD5) and ammonium.

2

This column applies to the parameters — dissolved iron, manganese, copper, zinc, sulphates, surfactants, phenols, nitrogen by the Kjeldahl method, total coliforms and faecal coliforms.

3

This column applies to the parameters — fluorides, boron, arsenic, cadmium, total chromium, lead, selenium, mercury, barium, cyanide, dissolved or emulsified hydrocarbons, polycyclic aromatic hydrocarbons, total pesticides, substances extractable by chloroform, faecal streptococci and salmonella.

<10,000111111211
> 10,000 to ≤30,000111211311
>30,000 to ≤100,000211421621
>100,0003218411241

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