S.I. No. 294/1989 — European Communities (Quality of Surface Water Intended for the Abstraction of Drinking Water) Regulations, 1989.

 

 

 

 

 

SCHEDULE

PART II

Surface Water Quality Standards

 

PART III

A. Table of Minimum Frequency of Sampling and Analyses

B. Table of Classification of Parameters according to Frequency

 

PART IV

Methods of Analysis

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SCHEDULE.

PART II

Surface Water Quality Standards

 

Parameters

Unit of measurement

Standards for Categories

 

 

 

A1

A2

A3

1.

pH

pH Unit

5.5-8.5

5.5-9.0

5.5-9.0

2.

Colouration (after simple filtration)

mg/1 Pt scale

20 (o)

100 (o)

150 (o)

3.

Total suspended solids

mg/1 SS

50

 

 

4.

Temperature

°C

25 (o)

25 (o)

25 (o)

5.

Conductivity

µs/cm-1 at 20 °C

1000

1000

1000

6.

Odour

(dilution factor at 25°C)

5

10

20

7.*

Nitrates

mg/1 NO3

50 (o)

50 (o)

50 (o)

8.

Fluorides

mg/1 F

1

1.7

1.7

9.*

Dissolved iron

mg/1 Fe

0.2

2

2

10.*

Manganese

mg/1 Mn

0.05

0.3

1

11.

Copper

mg/1 Cu

0.05 (o)

0.1 (o)

1 (o)

12.

Zinc

mg/1 Zn

3

5

5

13.

Boron

mg/1 B

2

2

2

14.

Arsenic

mg/1 As

0.05

0.05

0.1

15.

Cadmium

mg/1 Cd

0.005

0.005

0.005

16.

Total chromium

mg/1 Cr

0.05

0.05

0.05

17.

Lead

mg/1 Pb

0.05

0.05

0.05

18.

Selenium

mg/1 Se

0.01

0.01

0.01

19.

Mercury

mg/1 Hg

0.001

0.001

0.001

20.

Barium

mg/1 Ba

0.1

1

1

21.

Cyanide

mg/1 CN

0.05

0.05

0.05

22.

Sulphates

mg/1 SO4

200

200 (o)

200 (o)

23.

Chlorides

mg/1 C1

250

250

250

24.

Surfactants (reacting with methylene blue)

mg/1 (laurylsulphate)

0.2

0.2

0.2

25.*

Phosphates

mg/1 P2O5

0.5

0.7

0.7

26.

Phenols (phenol index) paranitraniline 4-aminoantipyrine

mg/1 C6H5CH

0.0005

0.005

0.1

27.

Dissolved or emulsified hydrocarbons (after extraction by petroleum ether)

mg/1

0.01

0.2

1

28.

Polycyclic aromatic hydrocarbons

mg/1

0.0002

0.0002

0.001

29.

Total pesticides (parathion, BHC, dieldrin)

mg/1

0.0005

0.0025

0.005

30.*

Chemical oxygen demand (COD)

mg/1 O2

 

 

40

31.*

Dissolved oxygen saturation rate

% O2

>60%

>50%

>30%

32.*

Biochemical oxygen demand (BOD5) (at 20 °C without nitrification)

mg/1 O2

5

5

7

33.

Nitrogen by Kjeldahl method (except in NO2 and NO3)

mg/1 N

1

2

3

34.

Ammonium

mg/1 NH4

0.2

1.5

4 (o)

35.

Substances extractable with chloroform

mg/1 SEC

0.2

0.4

1

36.

Total coliforms 37°C

/100 ml

5,000

25,000

100,000

37.

Faecal coliforms

/100 ml

1,000

5,000

40,000

38.

Faecal streptococci

/100 ml

200

2,000

10,000

39.

Salmonella

 

Not present in 500 ml

Not present in 100 ml

 

 

(o) = exceptional climatic or geographical conditions.

* = See article 5 (1) (d) [in respect of parameters marked with an asterisk in Part II of the Schedule in the case of surface water in shallow lakes or virtually stagnant surface water].

 

 

 

 

 

 

 

 

 

PART III

A.    Table of Minimum Frequency of Sampling and Analyses

Category of Surface Water

Population Served

A1

A2

A3

Classification of Parameters

I

II

III

I

II

III

I

II

III

500

1/5

*

*

*

*

*

2

1

1

500 –1,000

1/5

*

*

1/3

*

*

2

1

1

1,000 – 5,000

Ľ

*

*

˝

*

*

2

1

1

5,000–10,000

1/3

*

*

˝

*

*

2

1

1

10,000–30,000

1

1

1/3

2

1

˝

3

1

1

30,000- 100,000

2

1

1/3

4

2

1

6

2

1

> 100,000

3

2

˝

8

4

1

12

4

1

1/5 means once in 5 years.

2 means twice per annum.

*Frequency to be determined by the sanitary authority.

 

B. Table of Classification of Parameters according to Frequency

I

II

III

Parameter

Parameter

Parameter

1

pH

9

Dissolved iron

8

Fluorides

2

Colouration

10

Manganese

13

Boron

3

Total suspended solids

11

Copper

14

Arsenic

4

Temperature

12

Zinc

15

Cadmium

5

Conductivity

22

Sulphates

16

Total chromium

6

Odour

24

Surfactants

17

Lead

7

Nitrates

26

Phenols

18

Selenium

23

Chlorides

33

Nitrogen by Kjeldahl method

19

Mercury

25

Phosphates

36

Total coliforms

20

Barium

30

Chemical oxygen demand (COD)

37

Faecal coliforms

21

Cyanide

31

Dissolved oxygen saturation rate

 

 

27

Dissolved or emulsified hydrocarbons

32

Biochemical oxygen demand (BOD5)

 

 

28

Polycyclic aromatic hydrocarbons

34

Ammonium

 

 

29

Total pesticides

 

 

 

 

35

Substances extractable with chloroform

 

 

 

 

38

Faecal streptococci

 

 

 

 

39

Salmonella

 

 

PART IV    Methods of Analysis

 

Parameter

Limit of Detection

Precision ±

Accuracy ±

Methods of Analysis

1

pH

0.1

0.2

—Electrometry.

Measured in situ at the time of sampling without prior treatment of the sample.

2

Colouration

(after simple filtration)

5

10%

20%

—Filtering through a glass fibre membrane.

Photometric method using the plantinum-cobalt scale.

3

Total suspended solids

5%

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 2800 to 3200 g), drying at 105°C and weighing.

4

Temperature

0.5

1

—Thermometry.

Measured in situ at the time of sampling without prior treatment of the sample.

5

Conductivity at 20°C

5%

10%

—Electrometry.

6

Odour

—By successive dilutions. (Glass container recommended.)

7

Nitrates

2

10%

20%

—Molecular absorption spectrophotometry.

8

Fluorides

0.05

10%

20%

—Molecular absorption spectrophotometry after distillation if necessary.

—Ion selective electrodes.

9

Dissolved iron

0.02

10%

20%

—Atomic absorption spectrophotometry after filtering through a filter membrane (0.45 µm).

—Molecular absorption spectrophotometry after filtering through 0.45 µm filter membrane.

 

10

Manganese

0.01

10%

20%

—Atomic absorption spectrophotometry.

0.02(1)

10%

20%

—Atomic absorption spectrophotometry.

—Molecular absorption spectrophotometry.

11

Copper(2)

0.005

10%

20%

—Atomic absorption spectrophotometry.

—Polarography.

0.02(3)

10%

20%

—Atomic absorption spectrophotometry.

—Molecular absorption spectrophotometry.

—Polarography.

12

Zinc(2)

0.02

10%

20%

—Atomic absorption spectrophotometry.

—Molecular absorption spectrophotometry.

13

Boron(2)

0.1

10%

20%

—Molecular absorption spectrophotometry.

—Atomic absorption spectrophotometry.

(Materials for container not to contain boron in any significant quantities.)

14

Arsenic(2)

0.01

 

 

—Atomic absorption spectrophotometry.

—Molecular absorption spectrophotometry.

15

Cadmium(2)

0.001

30%

30%

—Atomic absorption spectrophotometry.

—Polarography.

16

Total chromium(2)

0.01

20%

30%

—Atomic absorption spectrophotometry.

—Molecular absorption spectrophotometry.

17

Lead(2)

0.01

20%

30%

—Atomic absorption spectrophotometry.

—Polarography.

18

Selenimum(2)

0.005

 

 

—Atomic absorption spectrophotometry.

19

Mercury(2)

0.002

30%

30%

—Flameless atomic absorption spectrophotometry (cold vaporization).

20

Barium(2)

0.02

15%

30%

—Atomic absorption spectrophotometry.

21

Cyanide

0.01

20%

30%

—Molecular absorption spectrophotometry.

22

Sulphates

10

10%

10%

—Gravimetric analysis.

—EDTA compleximetry.

—Molecular absorption spectrophotometry.

23

Chlorides

10

10%

10%

—Titration (Mohr's method).

—Molecular absorption spectrophotometry.

24

Surfactants (reacting with methylene blue)

0.05

20%

 

—Molecular absorption spectrophotometry.

25

Phosphates

0.02

10%

20%

—Molecular absorption spectrophotometry.

26

Phenols (phenol index)

0.0005

0.0005

0.0005

—Molecular absorption spectrophotometry

4-aminoantipyrine method.

0.001(1)

30%

50%

—Paranitraniline method.

(Glass container recommended.)

27

Dissolved or emulsified hydrocarbons.

0.01

20%

30%

—Infra-red spectrometry after extraction by

carbon tetrachloride.

0.04(1)

 

 

—Gravimetry after extraction by petroleum ether. (Glass container recommended.)

28

Polycyclic aromatic hydrocarbonds(2)

0.00004

50%

50%

—Measurement of fluorescene in the UV after thin layer chromatography. Comparative measurement in relation to a mixture of six control substances with the same concentration(4).

(Glass or aluminium container recommended.)

29

Total pesticides (parathion, hexachlorocyclohexane, dieldrin)(2)

0.0001

50%

50%

—Gas or liquid chromatography after extraction by suitable solvents and purification. Identification of the constituents of the mixture. Quantitative analysis.(5)

(Glass container recommended).

30

Chemical oxygen demand (COD)

15

20%

20%

—Potassium dichromate method.

31

Dissolved oxygen saturation rate

5

10%

10%

—Winkler's method. (Glass container recommended.)

—Electrochemical method.

32

Biochemical oxygen demand (BOD5) at 20°C without nitrification

2

1.5

2

—Determination of dissolved oxygen before and after five-day incubation at 20°C ± 1°C, in complete darkness.

—Addition of a nitrification inhibitor.

33

Nitrogen by Kjeldahl method (except in NO2 and NO3)

0.03

0.5

0.5

—Mineralization, distillation by Kjeldahl method and ammonium determination by means of molecular absorption spectrophotometry or titration.

 

34

Ammonium

0.1

10%

20%

—Molecular absorption spectrophotometry.

 

35

Substances extractable with chloroform

 

 

 

—Extraction at neutral pH value by purified chloroform, evaporation in vacuum at room temperature, weighing of residue.

 

36

Total coliforms

500

 

 

—Membrane filtration and culture at 37°C on an appropriate medium (such as Tergitol lactose agar, Endo agar, 0.4% Teepol broth) 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.

500

 

 

—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.

(Sterilized glass container recommended.)

37

Faecal coliforms

100

 

 

—Membrane filtration and culture at 44°C on an appropriate medium (such as Tergitol lactose agar, Endo agar, 0.4% Teepol broth) 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.

 

 

100

 

 

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

(Sterilized glass container recommended.)

38

Faecal streptococci

20

 

 

—Membrane filtration and culture at 37°C on an appropriate medium (such as sodium azide) and colony count. Samples must be diluted or, where appropriate, concentration in such a way as to contain between 10 and 100 colonies.

20

 

 

—Method of dilution in sodium azide broth in at least three tubes with three dilutions. Count according to MPN (most probable number). (Sterilized glass container recommended.)

39

Salmonella

1/500ml

 

 

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

1/1000ml

 

 

—Innoculation into pre-enrichment medium. Enrichment and transfer into isolating gelese — Identification.

(Sterilized glass container recommended.)

 (1) For surface water of categories A2 and A3.

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

(3) For surface water of category A3.

(4) 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; indeno (1, 2, 3-cd) pyrene.

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