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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)

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
1994

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent

Test solutions

Vehicle:
yes
Details on test solutions:
The substance was dissolved in sterile nutrient medium with the aid of a magnetic stirrer overnight to give an initial stoch solution of 100 mg/l.

Test organisms

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

Study design

Limit test:
no
Total exposure duration:
72 h

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
0.59 mg/L
Basis for effect:
biomass
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 4.1 mg/L
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
0.21 mg/L
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
0.21 mg/L
Basis for effect:
biomass

Any other information on results incl. tables

A statistically significant effect on growth (p<0.01) was observed at test concentration of 0.44 mg/l and above.

Growth (biomass) was also reduced by 15% compared with controls at 0.21 mg/l but this result was not statistically significant.

Results are based on mean measured conc. at 0 -72 h. Values ranged from 91 -104% of nominal at 0 h and 80 -130% of nominal at 72h.

Applicant's summary and conclusion