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
Study period:
March 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study by a laboratory having a GPL certificate

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Report date:
2009

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Certificate on november 27th 2007

Test material

Reference
Name:
Unnamed
Type:
Constituent

Test organisms

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

Study design

Test type:
static
Water media type:
saltwater
Total exposure duration:
72 h

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
meas. (initial)
Conc. based on:
dissolved
Basis for effect:
biomass
Remarks on result:
other: 95CI
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
meas. (initial)
Conc. based on:
dissolved
Basis for effect:
growth rate
Remarks on result:
other: 95CI

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The study was performed in compliance with the following quality criteria:
. The biomass in the control cultures has increased exponentially by a factor higher than 16 within the 72-day test period. This corresponds to a specific growth rate of 0.92 day e-1.
. The mean coefficient of variation for section-by-section specific growth rates (days 0-1, 1-2 and 2-3, for 72-hour tests) in the control cultures did not exceed 35%. This criterion applies to the mean value of coefficients of variation calculated for replicate control cultures.
. The coefficient of variation of average specific growth rates during the whole test period in replicate control cultures did not exceed 7%.