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

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Regulation 9

SCHEDULE 3

PART 1METHOD OF MEASURING THE VALUES OF PARAMETERS

No. in Annex I to the 1975 DirectiveParametersLimit of detection12Precision13Accuracy14Method of measurementMaterials recommended for the container
General note: Samples taken at the abstraction point are analysed and measured after sieving (wire mesh sieve) to remove any floating debris such as wood or plastic.
1

For waters classified as DW1, Schedule 2 limit.

2

For waters classified as DW2 and DW3.

3

For waters classified as DW3.

4

For waters classified as DW1, DW2 and DW3, Schedule 1 limit.

5

For waters classified as DW2, Schedule 1 limit, and DW3.

6

For waters classified as DW2 and DW3, Schedule 2 limit.

7

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

8

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

9

If the samples contain so much suspended matter as to require special preliminary treatment, the accuracy values shown in this Part of Schedule 3 may as an exception be exceeded and will be regarded as a target. These samples must be treated so as to ensure that the analysis covers the largest quantity of substances to be measured.

10

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 in the 1975 Directive can be attained.

11

Absence in 5,000 m1 (for waters classified DW1, Schedule 2 limit) and absence in 1,000 m1 (for waters classified DW2, Schedule 2 limit).

12

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

13

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

14

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

1pHpH unit0.10.2– Electrometry. Measured in situ at the time of sampling without prior treatment of the sample.
2Coloration (after simple filtration)mg/1 Pt Scale510%20%– Filtering through a glass fibre membrane. Photometric method using platinum-cobalt scale.
3Total suspended solidsmg/1 SS5%10%– Filtering through a 0.45μm filter membrane, drying at 105°C and weighing
– Centrifuging (for at least 5 mins with mean acceleration of 2,800 to 3,200g) drying at 105°C and weighing.
4Temperature°C0.51– Thermometry. Measured in situ at the time of sampling without prior treatment of the sample.
5Conductivity at 20°Cμs/cm5%10%– Electrometry.
No. in Annex I to the 1975 DirectiveParametersLimit ofPrecision13 detection12Accuracy14Method of measurement recommended for the containerMaterials
6Odourdilution factor at 25 °C– By successive dilutions.Glass.
7Nitratesmg/1 NO3210%20%– Molecular absorption spectrophotometry.
8Fluoridesmg/1 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 (0.45μm).

  • Molecular absorption spectrophotometry after filtering through a 0.45μm filter membrane.

11Manganesemg/1 Mn

0.011

0.022

10%

10%

20%

20%

  • Atomic absorption spectrophotometry

  • Atomic absorption spectrophotometry

  • Molecular absorption spectrophotometry.

12Copper9mg/1 Cu

0.005

0.023

10%

10%

20%

20%

  • Atomic absorption spectrophotometry

  • Polarography

  • Atomic absorption spectrophotometry

  • Molecular absorption spectrophotometry

  • Polarography.

No. in Annex I to the 1975 DirectiveParametersLimit of detection12Precision13Accuracy14Method of measurementMaterials recommended for the container
13Zinc9mg/1 Zn

0.011

0.02

10%

10%

20%

20%

  • Atomic absorption spectrophotometry

  • Atomic absorption spectrophotometry

  • Molecular absorption spectrophotometry.

14Boron9mg/1 B0.110%20%
  • Molecular absorption spectrophotometry

  • Atomic absorption spectrophotometry

Materials not containing boron in any significant quantities.
19Arsenic9mg/1 As

0.0021

0.014

20%20%
  • Atomic absorption spectrophotometry

  • Atomic absorption spectrophotometry

  • Molecular absorption spectrophotometry.

20Cadmium9mg/1 Cd

0.0002

0.0015

30%30%
  • Atomic absorption spectrophotometry

  • Polarography.

21Total Chromium9mg/1 Cr0.0120%30%
  • Atomic Absorption spectrophotometry

  • Molecular absorption spectrophotometry.

22Lead9mg/1 Pb0.0120%30%
  • Atomic absorption spectrophotometry

  • Polarography.

23Selenium9mg/1 Se0.005– Atomic absorption spectrophotometry.
24Mercury9mg/1 Hg

0.0001

0.00025

30%30%– Flameless atomic absorption spectrophotometry (cold vaporisation).
25Barium9mg/1 Ba0.0215%30%– Atomic absorption spectrophotometry.
26Cyanidemg/1 CN0.0120%30%– Molecular absorption spectrophotometry.
27Sulphatesmg/1 SO41010%10%
  • Gravimetric analysis.

  • EDTA compleximetry.

  • Molecular absorption spectrophotometry.

28Chloridesmg/1 C11010%10%
  • Titration (Mohr’s method).

  • Molecular absorption spectrophotometry.

29Surfactants (reacting with methylene blue)mg/1 (laury1 sulphate)0.0520%– Molecular absorption spectrophotometry.
30Phosphatesmg/1 P2O50.0210%20%– Molecular absorption spectrophotometry.
31Phenols (phenol Index)mg/1 C6H5OH

0.0005

0.0015

0.0005

30%

0.0005

50%

  • Molecular absorption spectrophotometry 4-aminoantipyrine method.

  • Paranitraniline method.

Glass.
32Dissolved or emulsified hydrocarbonsmg/1

0.01

0.042

20%30%
  • Infra-red spectrometry after extraction by carbon tetrachloride

  • Gravimetry after extraction by petroleum ether.

Glass.
33Polycyclic aromatic hydrocarbons9mg/10.0000450%50%

– Measurement of fluorescence in the UV after thin layer chromatography.

Comparative measurement in relation to a mixture of six control substances with the same concentration7.

Glass or aluminium.
34Total pesticides (parathion, hexachlorocyclohexane, dieldrin)9mg/10.000150%50%– Gas or liquid chromatography after extraction by suitable solvents and purification. Identification of the constituents of the mixture. Quantitative analysis8.Glass.
35Chemical oxygen demand (COD)mg/1 021520%20%– Potassium dichromate method.
36Dissolved oxygen saturation rate%510%10%
  • Winkler’s method

  • Electrochemical method.

Glass.
37Biochemical oxygen demand (BOD5) at 20°C without nitrificationmg/1 0221.52– Determination of dissolved oxygen before and after five day incubation at 20 °C ± 1°C in complete darkness. Addition of a nitrification inhibitor.
38Nitrogen by Kjeldahl method (except in NO2 and NO3)mg/1 N0.30.50.5– Mineralisation, distillation by Kjeldahl method and ammonium determination by means of molecular absorption spectrophotometry or titration.
39Ammoniummg/1 NH4

0.011

0.12

0.031

10%2

0.031

20%7

– Molecular absorption spectrophotometry.
40Substances extractable with chloroformmg/l10– Extraction at neutral pH value by purified chloroform, evaporation in vacuo at room temperature, weighing of residue.
43Total coliforms/100ml

51

5006

  • Culture at 37 °C on an appropriate specific solid medium (such as Tergitol lactose agar, Endo agar, 0.4% Teepol broth) with filtration1 or without filtration6 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.

  • 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/100ml

21

2006

  • Culture at 44 °C on an appropriate specific solid medium (such as Tergitol lactose agar, Endo agar, 0.4% Teepol broth) with filtration1 or without filtration6 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.

  • 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

21

2006

  • Culture at 37 °C on an appropriate solid medium (such as sodium azide) with filtration1 or without filtration6 and colony count. Samples must be diluted or, where appropriate concentrated in such a way as to contain between 10 and 100 colonies.

  • Method of dilution in sodium azide broth in at least three tubes in three dilutions. Count according to MPN (most probable number).

Sterilised glass.
46Salmonella11

1/5,000ml

1/1,000ml

  • Concentration by filtration (on membrane or appropriate filter).

  • Inoculation into pre-enrichment medium. Enrichment and transfer into isolating gelese – Identification.

Sterilised glass.

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