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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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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:
OECD Guideline 201 (Alga, Growth Inhibition Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Analytical monitoring:
yes
Test organisms (species):
Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum)
Test type:
static
Limit test:
no
Total exposure duration:
72 h
Reference substance (positive control):
yes
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
0.265 mg/L
Nominal / measured:
meas. (geom. mean)
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
EC10
Effect conc.:
0.088 mg/L
Nominal / measured:
meas. (geom. mean)
Basis for effect:
growth rate
Validity criteria fulfilled:
yes
Conclusions:
With an EC50 (growth) Bronidox K turned out to be very toxic to aquatic algea. Based on the observed EC10 (growth) of 0.088 mg/l long-term exposure to Bronidox K is toxic for algae.

Description of key information

The 72h ErC50 (growth) for algae ( Pseudokirchneriella subcapitata) exposed to the test substance was 0.265 mg/L based upon the measured geometric mean. Based on the observed EC10 (growth) of 0.088 mg/l long-term exposure to the test substance is toxic for algae.

Key value for chemical safety assessment

EC50 for freshwater algae:
0.265 mg/L
EC10 or NOEC for freshwater algae:
0.088 mg/L

Additional information