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:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Test was conducted according to Direcitve 92/69/EEC, C.3 and compliant with GLP.

Data source

Reference
Reference Type:
other: Body responsible for the test
Title:
Unnamed
Year:
1990

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: Direcitve 92/69/EEC, C.3
Deviations:
not specified
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Identity and concentration of auxiliary solvent for dispersal: Supersaturated solutions stirred for four days and then filtered.
No solvents used.

Test organisms

Test organisms (species):
Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum)

Study design

Total exposure duration:
72 h

Test conditions

Hardness:
24 mg CaCO3/L

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 0.5 mg/L
Basis for effect:
biomass
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
0.5 mg/L
Basis for effect:
growth rate
Details on results:
% Concentration loss over test: 75...

Any other information on results incl. tables

The poor solubility of the substance made is very difficult to maintain the test concentration and a large percentage of the substance was lost in the first 24 hours. After this period the concentration stabilised at around 0.1 -0.5 mg/l and exposure was consistent. No effects were seen in any of the samples tested and so the LC50 can be said to be greater than the maximum sustainable concentration of 0.5 mg/l.

Applicant's summary and conclusion