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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

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
Qualifier:
equivalent or similar to guideline
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
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:
Other than impact of colour and light absorption, it is not considered inhibitory to algal growth
Executive summary:

From assessment of similar sulphonated azo substances, it is concludes that CJ306 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.  

 

The read-across is valid and is backed up by review documents, including an assessment of azo dyes by the Danish EPA that conclude low environmental toxicity to aquatic organisms.

 

Description of key information

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

From assessment of similar sulphonated azo substances, it is concludes that CJ306 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.  

 

The read-across is valid and is backed up by review documents, including an assessment of azo dyes by the Danish EPA that conclude low environmental toxicity to aquatic organisms.