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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Link to relevant study record(s)

Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Study period:
72 hours
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Peer reviewed publication cited in government reviews
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 201 (Alga, Growth Inhibition Test)
GLP compliance:
not specified
Specific details on test material used for the study:
Not specified.
Considered a good source of water soluble vanadium for aquatic testing.
Analytical monitoring:
yes
Details on sampling:
Samples for vanadium analysis were also collected at the start and end of each test to quantify actual exposure concentrations.
Vehicle:
no
Test organisms (species):
Scenedesmus quadricauda
Details on test organisms:
Scenedesmus quadricauda was identified as a regionally-representative green algal species
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
72 h
Hardness:
ca 110 mg/l CaCO3
Test temperature:
ca 23 C
pH:
ca 8.6
Details on test conditions:
Reconstituted water in continuous lighting
Reference substance (positive control):
no
Duration:
72 h
Dose descriptor:
IC50
Effect conc.:
ca. 4.12 mg/L
Nominal / measured:
meas. (arithm. mean)
Conc. based on:
element
Remarks:
Vanadium
Basis for effect:
growth rate
Key result
Duration:
72 h
Dose descriptor:
IC50
Effect conc.:
ca. 14 mg/L
Nominal / measured:
estimated
Conc. based on:
test mat.
Basis for effect:
growth rate
Remarks on result:
other: Starting with IC50 4.12 mg/l for V and using molecular weight of constituent with greatest proportion of vanadium
Details on results:
The reported IC50 (growth rate) was in the range of 3.06 - 4.85 mg/l, with an EC10 of 0.27 mg/l vanadium, suggesting a shallow dose response.
Vanadium is considered to be an essential element for plants.
Conclusions:
Using a molecular weight of 173 for the registered substance, the IC50 has been estimated to be > 10 mg/l

Description of key information

Using a molecular weight of 173 for the registered substance, the IC50 has been estimated to be ca 14 mg/l

Key value for chemical safety assessment

EC50 for freshwater algae:
14 mg/L

Additional information