Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:
effects on growth of green algae
Type of information:
experimental study
Adequacy of study:
key study
Study period:
April 5, 2002 - June 21, 2002
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2002
Report date:
2002

Materials and methods

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

Test material

Constituent 1
Chemical structure
Reference substance name:
2-methyl-4-oxo-3-(prop-2-en-1-yl)cyclopent-2-en-1-yl (1R)-2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropane-1-carboxylate
EC Number:
687-634-7
Cas Number:
231937-89-6
Molecular formula:
C19H26O3
IUPAC Name:
2-methyl-4-oxo-3-(prop-2-en-1-yl)cyclopent-2-en-1-yl (1R)-2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropane-1-carboxylate
Test material form:
liquid: viscous

Sampling and analysis

Analytical monitoring:
yes

Test solutions

Vehicle:
yes

Test organisms

Test organisms (species):
Scenedesmus sp.

Study design

Test type:
static
Water media type:
other: synthetic test water
Total exposure duration:
72 h

Test conditions

Hardness:
0.24 mmol/L as CaCO3
Test temperature:
23 °C
pH:
8.1 - 9.6
Nominal and measured concentrations:
0.03, 0.1, 0.32, 1.0, 3.2 and 10 mg/L - nominal
0.03, 0.1, 0.32, 1.0, 2.3 and 7.4 mg/L - measured (mean)

Results and discussion

Effect concentrationsopen allclose all
Key result
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
0.32 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
0.1 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
test mat.
Basis for effect:
biomass
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
2.8 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
1.1 mg/L
95% CI:
0.3 - 7.7
Nominal / measured:
meas. (not specified)
Conc. based on:
test mat.
Basis for effect:
biomass

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The EC values were calculated for both algal biomass and growth rate after 72 hours duration based on the mean measured test item concentrations - results above.
Executive summary:

Influence on the growth rate of the green algal species as investigated in a 72-hour static test. The test item had a statistically significant inhibitory effect on the biomass and growth rate after an exposure period of 72 hours.