Registration Dossier
Registration Dossier
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EC number: 232-219-4 | CAS number: 7790-75-2
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Calcium wolframate is a moderately soluble inorganic salt consisting of divalent calcium cations and divalent wolframate oxo-anions and thus liberates calcium cations and wolframate anions upon dissolution.Thus, the fate and toxicity of calcium wolframate in the environment is most accurately evaluated by separately assessing the fate of its moieties calcium cations and wolframate anions.
Calcium as essential element has a very low potential for toxicity to freshwater and saltwater algae.
In a guideline test (OECD 201) with the soluble salt sodium wolframate, the 72-h ErC50 for the inhibition of growth rate of P. subcapitata was reported with 52.9 mg sodium wolframate/L whereas the corresponding 72-h NOErC and ErC10 were estimated with <10.9 mg sodium wolframate/L (all measured). Since the wolframate content of sodium and calcium wolframate is comparable and sodium wolframate (742 g/L in water; CRC handbook, 2008) is more soluble than calcium wolframate (6.4 mg/L in water), the effect concentrations are above the water solubility limit of calcium wolframate.
Thus, calcium wolframate is expected to have a low potential for toxicity to aquatic algae.
Key value for chemical safety assessment
Additional information
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