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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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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: GLP guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2007
Report Date:
2007

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
Qualifier:
according to
Guideline:
EU Method C.3 (Algal Inhibition test)
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent

Test organisms

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

Study design

Water media type:
freshwater
Limit test:
no
Total exposure duration:
72 h

Test conditions

Nominal and measured concentrations:
nominal 4.27, 9.39, 20.7, 45.5 and 100 mg/L
mean measured 4.10, 9.33, 19.2, 44.8 and 103 mg/l.

Results and discussion

Effect concentrationsopen allclose all
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
93.5 mg/L
Nominal / measured:
meas. (arithm. mean)
Conc. based on:
test mat.
Basis for effect:
growth rate
Remarks on result:
other: 95% confidence limits, 85.8 and 101 mg/l
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
30.3 mg/L
Nominal / measured:
meas. (arithm. mean)
Conc. based on:
test mat.
Basis for effect:
biomass
Remarks on result:
other: 95% confidence limits, 22.7 and 41.2 mg/l
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
9.33 mg/L
Nominal / measured:
meas. (arithm. mean)
Conc. based on:
test mat.
Basis for effect:
growth rate
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
9.33 mg/L
Nominal / measured:
meas. (arithm. mean)
Conc. based on:
test mat.
Basis for effect:
biomass

Applicant's summary and conclusion

Conclusions:
After 72 hours of exposure to VRT-126017 dcha, the EbC50 and ErC50, were 30.3 and 93.5 mg/l respectively.
The “no observed effect concentration” (NOEC) for both area under the growth curve and growth rate was 9.33 mg/l.