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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Reference
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:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method C.3 (Algal Inhibition test)
GLP compliance:
yes
Analytical monitoring:
yes
Details on test solutions:
Identity and concentration of auxiliary solvent for dispersal: The substance was directly dissolved in the test medium.
Test organisms (species):
Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
Details on test organisms:
Green algae
Test type:
static
Water media type:
freshwater
Limit test:
yes
Total exposure duration:
72 h
Hardness:
24 mg CaCO3/L
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
biomass
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
biomass
Details on results:
As actual concentrations decreased by more than 20 % from initial during the test, toxicity parameters were based on time weighed average exposure concentrations. These average concentrations were between 65.5 and 69.3 %.
Validity criteria fulfilled:
not specified
Conclusions:
The 72h-EC50 and 72h-NOEC were determined to be higher than 100 mg/L in green algae (basis for effect: growth rate and biomass).
Executive summary:

The study was conducted according to EU Method C.3 (Algal inhibitory test) (GLP study). Selenastrum capricornutum was exposed to the substance for 72 hours. The actual concentrations decreased by more than 20 % from initial during the test. These average concentrations were between 65.5 and 69.3 %. No effects were observed during the 72 hour test period. The EC50 and NOEC after based on growth rate and biomass were determined to be higher than 100 mg/L at the end of the exposure of 72 hours.

Description of key information

Key study: EU Method C.3 (GLP study). The 72h-EC50 and 72h-NOEC were determined to be higher than 100 mg/L in green algae (basis for effect: growth rate and biomass).

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
100 mg/L

Additional information