ANNEX 8 List of determinands and water quality classifications used in TNMN

Determinand Unit
Class


I
II - TV
III
IV
V


Class limit values
Oxygen/Nutrient regime






Dissolved oxygen * mg.l-1
7 6 5 4 <
4
BOD5 mg.l-1 3
5
10 25 >
25
CODMn mg.l-1
5 10 20 50 >
50
CODCr mg.l-1
10 25 50 125
>
125
pH -

>
6.5* and



< 8.5
Ammonium-N mg.l-1
0.2 0.3 0.6 1.5 >
1.5
Nitrite-N mg.l-1
0.01 0.06 0.12 0.3 >
0.3
Nitrate-N mg.l-1
1 3 6 15
>
15
Total-N mg.l-1 1.5
4
8
20 >
20
Ortho-phosphate-P mg.l-1
0.05 0.1 0.2 0.5 >
0.5
Total-P mg.l-1
0.1 0.2 0.4 1 >
1
Chlorophyll-a
µg.l-1
25 50 100 250
>
250
Metals
(dissolved)
**

Zinc
µg.l-1
- 5 - - -
Copper
µg.l-1
- 2 - - -
Chromium (Cr-III+VI)
µg.l-1
- 2 - - -
Lead
µg.l-1
- 1 - - -
Cadmium
µg.l-1
- 0.1 - - -
Mercury
µg.l-1
- 0.1 - - -
Nickel
µg.l-1
- 1 - - -
Arsenic
µg.l-1
- 1 - - -
Metals
(total)


Zinc
µg.l-1
bg 100 200 500 >
500
Copper
µg.l-1
bg 20 40 100
>
100
Chromium (Cr-III+VI)
µg.l-1
bg 50 100 250
>
250
Lead
µg.l-1
bg 5 10 25
>
25
Cadmium
µg.l-1
bg 1 2 5 >
5
Mercury
µg.l-1
bg 0.1 0.2 0.5 >
0.5
Nickel
µg.l-1
bg 50 100 250
>
250
Arsenic
µg.l-1
bg 5 10 25
>
25
Toxic
substances


AOX
µg.l-1
10 50 100 250
>
250
Lindane
µg.l-1
0.05 0.1 0.2 0.5 >
0.5
p,p´-DDT
µg.l-1
0.001 0.01 0.02 0.05 >
0.05
Atrazine
µg.l-1
0.02 0.1 0.2 0.5 >
0.5
Trichloromethane
µg.l-1
0.02 0.6 1.2 1.8 >
1.8
Tetrachloromethane
µg.l-1
0.02
1 2 5 >
5
Trichloroethene
µg.l-1
0.02
1 2 5 >
5
Tetrachloroethene
µg.l-1
0.02
1 2 5 >
5
Biology


Saprobic Index -
-
1.8
1.81 ­ 2.3 2.31 ­ 2.7 2.71 ­ 3.2
> 3.2
macrozoobenthos
* values
concern
10-percentile
value bg
background
values
** for dissolved metals only guideline values are indicated

TV
target value

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