Water quality standards for List I substances
|
Parameter
|
Unit
|
Water quality standard
|
Standstill Provision a
|
|
Estuaryb
|
Marine
|
| Mercury |
µg Hg/l
|
0.5 DAA
|
0.3 DAA
|
yesc
|
| Cadmium |
µg Cd/l
|
5 DAA
|
2.5 DAA
|
yes
|
| Hexachlorocyclohexaned |
µg HCH/l
|
0.02 TAA
|
0.02 TAA
|
yes
|
| Carbon
tetrachloride |
µg
CCl4/l
|
12 TAA
|
12 TAA
|
no
|
| Dichlorodiphenyltrichloroethane |
|
|
|
|
| (all
4 isomers, total DDT) |
µg DDT/l
|
0.025 TAA
|
0.025 TAA
|
yes
|
| (para,
para-DDT) |
µg ppDDT/l
|
0.01 TAA
|
0.01 TAA
|
yes
|
| Pentachlorophenol |
µg PCP/l
|
2 TAA
|
2 TAA
|
yes
|
| Total
>drins= |
µg/l
|
0.03 TAA
|
0.03 TAA
|
yes
|
| Aldrine |
µg/l
|
0.01 TAA
|
0.01 TAA
|
yes
|
| Dieldrine |
µg/l
|
0.01 TAA
|
0.01 TAA
|
yes
|
| Endrin |
µg/l
|
0.005 TAA
|
0.005 TAA
|
yes
|
| Isodrine |
µg/l
|
0.005TAA
|
0.005 TAA
|
yes
|
| Hexachlorobenzenef |
µg HCB/l
|
0.03 TAA
|
0.03 TAA
|
yes
|
| Hexachlorobutadienef |
µg HCBD/l
|
0.1 TAA
|
0.1 TAA
|
yes
|
| Chloroformf |
µg
CHCl3/l
|
12 TAA
|
12 TAA
|
no
|
| 1,2-Dichloroethaneg
(ethylenedichloride) |
µg EDC/l
|
10 TAA
|
10 TAA
|
no
|
| Perchloroethyleneg
(tetrachloroethylene) |
µg PER/l
|
10 TAA
|
10 TAA
|
no
|
| Trichlorobenzeneg
(all isomers) |
µg TCB/l
|
0.4 TAA
|
0.4 TAA
|
yes
|
| Trichloroethyleneg |
µg TRI/l
|
10 TAA
|
10 TAA
|
no
|
Notes
Substances are listed in the order of publication
of Directives.
D dissolved concentration, ie usually involving
filtration through a 0.45-µm membrane filter before
analysis
T total concentration (ie without filtration)
AA standard defined as annual average
Most directives include, in addition to the standards
for inland, estuary and marine waters, a provision
that the total concentration of the substance in
question in sediments and/or shellfish and/or fish
must not increase significantly with time (the "standstill"
provision).
In the UK the standards for estuaries are the same
as for marine waters - The Surface Waters (Dangerous
Substances) (Classification) Regulations 1989
In addition to a standstill provision applying
to sediments or shellfish there is a further environmental
quality standard of 0.3 mg Hg/kg wet flesh "in
a representative sample of fish flesh chosen as
an indicator".
All isomers, including lindane
The standard relating to the concentration of this
substance came into effect on 1 January 1994.
The provisions of the directive on this substance
came into force on 1 January 1990.
The provision of the directive on this substance
came into effect on 1 January 1993.
References
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