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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Reference:
Composition 1
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
Principles of method if other than guideline:
The assessment of data from different sources concentrated on data obtained by methods equivalent to OECD 201
It is noted that OECD guidance on testing coloured substances does not appear to have been followed in cases where inhibitrion was noted.
GLP compliance:
not specified
Test material information:
Composition 1
Analytical monitoring:
not specified
Vehicle:
no
Test organisms (species):
Scenedesmus sp.
Test type:
static
Water media type:
freshwater
Limit test:
no
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Validity criteria fulfilled:
not specified
Conclusions:
Not considered biologically active, but will inhibit algal growth due to intense colour
Executive summary:

From assessment of similar substances, it is concludes that CJ304 need not be classified as hazardous to aquatic organisms on the basis of effects to aquatic plants. Although some references show an inhibition of growth rates biomass at concentrations below 100 mg/l, it is considered very likely that this is mainly due to absorption of light at wavelengths liked to photosynthesis.

 

No convincing evidence has been found that the substance causes harm to aquatic plants, other than shading from the coloured material.  

Description of key information

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
100 mg/L

Additional information

From assessment of similar substances, it is concludes that CJ304 need not be classified as hazardous to aquatic organisms on the basis of effects to aquatic plants. Although some references show an inhibition of growth rates biomass at concentrations below 100 mg/l, it is considered very likely that this is mainly due to absorption of light at wavelengths liked to photosynthesis.

 

No convincing evidence has been found that the substance causes harm to aquatic plants, other than shading from the coloured material.