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Classification of Water Hazard according to the Federal Water Act

Wassergefährdungsklassen

Following „Wasserhaushaltsgesetz“ (Federal Water Act), all chemicals and products are classified. For this purpose several tests have to be performed, the results give certain numerical values which add up to a water hazard number and result in a water hazard class.

Classification of Water Hazard following VwVwS Annex 3 – 1

Classification values for combinations of biodegradation, biodegradationpotential and aquatic toxicity

 
 
Aquatic toxicity (LC50/IC50/EC50)
mg/l (Fish, Alga, Daphnia)
Biodegradation
Bioaccu-
mulation
potential
> 100
10 – 100
1 – 10
1
ready
(> 60/70%)
(OECD 301)
yes
(log POW 3,0)
0
0
6 / R51/53
8 / 50/53
no
0
0
0
6 / R50
inherent
(> 70%)
(OECD 302)
yes
(log POW 3,0)
0
0
6 / R51/53
8 / R50/53
no
0
0
6 / R51/53
8 / R50/53
not ready or inherent
yes
(log POW 3,0)
3 / R 53
4 / R52/53
6 / R51/53
8 / R50/53
no
0
4 / R52/53
6 / R51/53
8 / R50/5

R-classification: following the demands of Hazardous Substances Act.
Several species tested: the lowest value has to be taken into account missing data: substance is considered not biodegradable, with bioaccumulation potential, LC/IC/EC50 1 mg/l

Classification of Water Hazard following VwVwS Annex 3 – 2
 

Classification values for mammalian toxicity

 
0
1
3
5
oral
(mg/kg BW)
LD50
2000
200 < LD50
2000 (R 22)
25 < LD50
200 (R 25)
LD50
25 (R 28)
dermal
(mg/kg BW)
LD50 2000
400 < LD50
2000 (R 21)
50 < LD50
400 (R 24)
LD50
50 (R 27)

R-classification: following the demands of Hazardous Substances Act
The lowest value for toxicity has to be taken into account
missing data: LD50 is considered to be below 25 mg/kg body weight (=BW)
Other R-classifications which have to be considered: see annex 3 VwVws.

Water Hazard Class (WHC) following VwVwS Annex 3
Sum of values
0 (+ more criteria)
0 – 4
5 – 8
9
WHC
0
1
2
3

 

„Substance presents no hazard to aquatic systems“
Conditions for the classification as „not hazardous to aquatic systems“
 
Parameter
Criterion
Sum of values
0 (zero)
Water Solubility at 20 oC
< 100 mg/l (gases/solids)
< 10 mg/l (liquids)
Aquatic toxicity
(Fish, Daphnia, Alga)
at least two species are tested;
LC/IC/EC50 > solubility
Biodegradability
ready (for organic liquids)

 

Classification of Mixtures/Products

Classification following composition

Water Hazard Classification following Annex 4 - 1

Equation for Classification following the WHC of the components

 

WHC

Property of component
not hazardous
1
2
3
WHC 1
< 3%
 
 
 
WHC 2
< 0,2%
< 5%
 
 
WHC 3
< 0,2%
(may not be added)
< 0,2%
< 3%
 
R45
(carcinogene)
< 0,1%
(may not be added)
< 0,1%
> 0,1%,
but WHC 2
 

 

The WHCs of the components must be known. If not all components are known/characterized, a WHC of 3 will be calculated for the unknown compounds.
If a component with WHC 3 or R45 is actively added to a mixture, the mixture is classified as WHC or higher.

Classification of Water Hazard following VwVwS Annex 4 – 2.1

Classification following examination

 
Classification values for mammalian toxicity
 
0
1
3
5
oral
(mg/kg BW)
LD50 2000
200
< LD50
≤ 2000 (R22)
25
< LD50
≤ 200 (R25)
LD50
≤ 25 (R28)
dermal
(mg/kg BW)
LD50 2000
400
< LD50
  ≤ 2000 (R21)
50
< LD50
≤ 400 (R24)
LD50
≤ 50 (R27)

 

R-classification: following the demands of Hazardous Substances Act
The lowest value for toxicity has to be taken into account
missing data: LD50 is considered to be below 25 mg/kg body weight (=BW)

Other R-classifications which have to be considered: see annex 3 VwVws.

Classification of Water Hazard following VwVwS Annex 4 – 2.2
 

Classification values for aquatic toxicity

 
3
4
6
8
LC50/ IC50/ EC50 (mg/l)
100
< LC/IC/EC
10
< LC/IC/EC
≤ 100
1
< LC/IC/EC
≤ 10
LC/IC/EC
≤ 1

At least two species from different trophic stages have to be tested. The lower value is considered in classification.

Mixtures are considered as not biodegradable and having bioaccumulation potential. The opposite has to be proven by a degradation test or through examinations of the isolated compounds (bioaccumulation potential). If this is the case, classification has to be approved by the “Commission for the Assessment of Substances hazardous to Aquatic Systems”.