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: Meets the criteria for classification as Reliable without restriction according to Klimisch et al (1997)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1997

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: Annex V, C3 and OECD No. 201
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent

Test organisms

Test organisms (species):
other: Selenastrum capricornutum (CCAP 278

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.:
0.076 mg/L
Basis for effect:
biomass
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
0.02 mg/L
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
0.022 mg/L
Basis for effect:
growth rate
Details on results:
%Concentration loss over test: ... 99.7

Any other information on results incl. tables

All results are expressed on geometric mean measured concentrations which ranged from 10-48% of nominal in this
study.

Measured concentrations ranged from 84-121% of nominal at 0 hours and 0-1% of nominal at 72 hours.Comparison of the measured concentrations of the test substance from medium samples at a concentrations equivalent to the highest test concentration, but without the addition
of algal cells, indicated that the presence of algal cells had not affected the stability of the exposure solutions.

Applicant's summary and conclusion