ANNEX 9 Interim scheme for water and sediment quality classification
for TNMN purposes*


Interim scheme for water and sediment quality classification for TNMN
purposes *


Determinands in water (90-Percentiles)

2- 5x
> 5x

reference TV
1- 2x TV
TV
TV

CLASS




class limit values
unit
I
II
III
IV
V
oxygen/nutrient regime






temperature
C





dissolved oxygen **
mg/l
7
6
5
4
<4
BOD5 mg/l
3
5
10
25
>25
COD-Mn mg/l
5
10
20
50
>50
COD-Cr mg/l
10
25
50
125
>125
TOC

-
-
-
-
-
pH (acid.)
-

>6.5



pH (alkal.)
-

and <8.5


ammonium-N mg/l
0.2
0.3
0.6
1.5
>1,5
nitrite-N mg/l
0.01
0.06
0.12
0.3
>0,3
nitrate-N mg/l
1
3
6
15
>15
total-N mg/l
1.5
4
8
20
>20
organic-N
mg/l




ortho-P mg/l
0.05
0.1
0.2
0.5
>0,5
total-P mg/l
0.1
0.2
0.4
1
>1
chlorophyll -a
ug/l
25
50
100
250
>250







ions






calcium (Ca)
mg/l
-
-
-
-

sulphate (SO4)
mg/l
-
-
-
-

magnesium (Mg)
mg/l
-
-
-
-
-
potassium (K)
mg/l
-
-
-
-
-
sodium (Na)
mg/l
-
-
-
-
-
manganese (Mn)
mg/l
-
-
-
-
-
iron (Fe)
mg/l
-
-
-
-
-
chloride (Cl)
mg/l
-
-
-
-
-







metals (dissolved) ***






Zinc (Zn)
ug/l
-
5 -
-
-
Copper (Cu)
ug/l
-
2 -
-
-
Chromium /Cr-III+VI)
ug/l
-
2 -
-
-
Lead (Pb)
ug/l
-
1 -
-
-
Cadmiun (Cd)
ug/l
-
0.1 -
-
-
Mercury (Hg)
ug/l
-
0.1 -
-
-
Nickel (Ni)
ug/l
-
1 -
-
-
Arsenic (As)
ug/l
-
1 -
-
-
Aluminium (Al)
ug/l
-
-
-
-
-

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2
Interim scheme for water and sediment quality classification for TNMN
purposes *
metals (total)






Zinc (Zn )
ug/l
bg
100
200
500
> 500
Copper (Cu)
ug/l
bg
20
40
100
> 100
Chromium (Cr-III+VI)
ug/l
bg
50
100
250
> 250
Lead (Pb)
ug/l
bg
5
10
25
> 25
Cadmium (Cd)
ug/l
bg
1
2
5
> 5
Mercury (Hg)
ug/l
bg
0.1
0.2
0.5
> 0,5
Nickel (Ni)
ug/l
bg
50
100
250
> 250
Arsenic (As)
ug/l
bg
5
10
25
> 25
Aluminium (Al)
ug/l












toxic substances






phenol index






Anionic active surfactants






AOX ug/l
10
50
100
250
>250
Petroleum hydrocarbons

-
-
-
-
-
PAH (sum of 6)

-
-
-
-
-
PCB (sum of 7)

-
-
-
-
-
lindane/c-HCH ug/l
0.05
0.1
0.2
0.5
>
0.5
pp'-DDT ug/l
0.001
0.01
0.02
0.05
>
0.05
atrazine ug/l
0.02
0.1
0.2
0.5
>
0.5
trichloromethane ug/l
0.02
0.6
1.2
1.8
>1.8
tetrachloromethane ug/l
0.02
1 2 5
>
5
trichloroethane ug/l
0.02
1
2
5
>
5
tetrachloroethane ug/l
0.02
1
2
5
>
5














biology






1,81 -
2,31 -
2,71 -
aprobic index MZB

<1,8
2,3
2,7
3,2
>3,2







microbiology






/100
total coliformes
ml -
-
-
-
-
/100
faecal coliforms
ml -
-
-
-
-
* - This classification system was elaborated for the general presentation of the situation in the Danube river basin
(assessment of TNMN stations) and not to be a tool for implementation of national water policy
** - values concern 10-percentile value
*** - for dissolved metals only guideline values are indicated
bg - background values
TV - target value

The following colours express water quality classes:

blue colour
class I
green colour
class II
yellow colour
class III
orange colour
class IV
red colour
class V

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