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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Link to relevant study record(s)

Reference
Endpoint:
short-term toxicity to aquatic invertebrates
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24 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 202 (Daphnia sp. Acute Immobilisation Test)
GLP compliance:
not specified
Specific details on test material used for the study:
Considered a good source of water soluble vanadium for assessment
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):
Daphnia pulex
Test type:
semi-static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Hardness:
ca 108 mg/l CaCO3
Test temperature:
23 C
pH:
ca 8.3
Dissolved oxygen:
ca 8.4 mg/l O2
Nominal and measured concentrations:
Not specified
Reference substance (positive control):
no
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
ca. 2.17 mg/L
Nominal / measured:
meas. (arithm. mean)
Conc. based on:
element
Remarks:
Vanadium
Basis for effect:
mobility
Key result
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
ca. 7.4 mg/L
Nominal / measured:
estimated
Conc. based on:
test mat.
Basis for effect:
mobility
Remarks on result:
other: Starting with EC50 2.17 mg/l for V and using molecular weight 173 for constituent with greatest proportion of vanadium
Details on results:
EC50 range between replicates was 1.91 - 2.45 mg/l vanadium
Conclusions:
Although the test was performed on an alternative vanadium salt, the toxicity is based on vanadium ions in solution.
The sulphate would not impact on the toxicity (the test water contained magnesium sulphate as part of the hardening process)
EC50 for registered substance using molecular weight 173 estimated to be ca 7.4 mg/l

Description of key information

Although the test was performed on an alternative vanadium salt, the toxicity is based on vanadium ions in solution.

The sulphate would not impact on the toxicity (the test water contained magnesium sulphate as part of the hardening process)

Various other references found, all with similar figures for reported EC50

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
7.4 mg/L

Additional information