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EC number: 231-900-3
CAS number: 7778-18-9
Data is available on the acute toxicity of calcium sulfate to algae. No
short-term toxicity was observed at the concentrations tested.
A GLP guideline study was performed which assessed the acute
toxicity of calcium sulfate dihydrate (NIER, 2003) to Selenastrum
(new name: Pseudokirchnerella subcapitata) in a
limit test. The 72 h EC50 for calcium sulfate dihydrate was found to be
>100 mg/L, which is equivalent to >79 mg/L for calcium sulfate
anhydrous. No adverse effects were noted at this concentration.
A further OECD guideline study (van Eijk, 2009), investigated the
toxicity of flue gas desulphurisation gypsum on algae. The results
showed that toxicity of the test material was low in all samples and
that no toxicity was detected in the 100% undiluted sample (equivalent
to a saturated solution of gypsum at a concentration of 2.1 g/L). The
EC50 is therefore >2.1 g/L and hence is greater than the maximum
solubility of calcium sulfate in water. The NOEC is equal to 2.1 g/L.
A literature study which assessed the toxicity of calcium sulfate to the
algal species Nitscheria linearis gave a 120 h EC50 value of >3200 mg/L.
No effects were noted and this concentration is greater than the maximum
solubility of calcium sulfate in water.
Using a weight of evidence approach, calcium sulfate showed no
short-term toxicity to algae and is not acutely toxic to algae at the
limit of its water solubility.
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