Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study obtained through inquiry process; SNIF file obtained from ECHA.

Data source

Reference
Reference Type:
other: SNIF
Title:
Unnamed
Year:
1997

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method C.3 (Algal Inhibition test)
Deviations:
not specified
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
not specified

Sampling and analysis

Analytical monitoring:
not specified

Test solutions

Vehicle:
not specified

Test organisms

Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)

Study design

Test type:
not specified
Water media type:
freshwater
Limit test:
yes
Total exposure duration:
72 h

Test conditions

Hardness:
24 mg CaCO3/L
Reference substance (positive control):
not specified

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 0.41 mg/L
Nominal / measured:
not specified
Conc. based on:
not specified
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
> 0.41 mg/L
Nominal / measured:
not specified
Conc. based on:
not specified
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 0.41 mg/L
Nominal / measured:
not specified
Conc. based on:
not specified
Basis for effect:
biomass
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
> 0.41 mg/L
Nominal / measured:
not specified
Conc. based on:
not specified
Basis for effect:
biomass
Details on results:
%Concentration loss over test: ... 55;
No effects noted at above the level of water solubility.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Conclusions:
EC50 > 0.41 mg/L (72h, basis for effect: biomass and growth rate)
NOEC > 0.41 mg/L (72h, basis for effect: biomass and growth rate)
Due to its very low water solubility (see IUCLID section 4.8), the test substance is considered not to be toxic to aquatic algae under the conditions of the test.
Executive summary:

The acute toxicity of the test substance to aquatic algae has been determined in a test with Scenedesmus subspicatus (new name: Desmodesmus subspicatus) according to EU Method C.3. The EC50 (72h) and the NOEC (72h) were > 0.41 mg/L (based on growth rate and biomass). Hence, it can be stated that there is no toxicity in the range of the low water solubility of the test substance. Therefore, the test substance is considered not to be harmful to aquatic algae.