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EC number: 238-694-4
CAS number: 14644-61-2
A weight of evidence approach was used to cover this endpoint. Two studies were included. The study of Harris (2014a) yielded a 96-h LC50 for rainbow trout > 100% v/v saturated solution of zirconium sulfate. A study with the insoluble read across substance zirconium dioxide yielded a similar 96-h LC50 of > 100 mg/L for zebra fish (Bazzon, 2000).
Three studies were included to cover this endpoint.
The most recent study was performed with zirconium sulfate in rainbow
trout (Harris, 2014a). A stirring experiment performed to obtain a 100%
v/v saturated solution indicated that no dissolved zirconium
concentrations above the LOQ of 20 µg Zr/L could be detected. In
addition, in a 100% v/v saturated solution, no mortality of fish was
observed after 96 h (range finder). Since a measurable amount of
zirconium could not be obtained in solution, it was decided at the
request of the sponsor not to conduct a final toxicity test for
zirconium sulfate. Based on the results of the range finding study, the
96-h LC50 was concluded to be > 100% v/v saturated solution.
It was considered most useful to cover the endpoint using a weight of
evidence approach including the study from Harris (2014a) for zirconium
sulfate, as well as a study performed with zirconium dioxide, an
insoluble zirconium compound (Bazzon, 2000). This is considered relevant
because at environmentally relevant conditions, zirconium from zirconium
sulfate disappears from the aqueous solution through precipitation
(e.g., as zirconium dioxide, zirconium hydroxide, zirconium carbonate,
zirconium phosphate, etc.). The study from Bazzon (2000) also yielded a
96-h LC50 of > 100 mg/L (based on nominal initially added zirconium
dioxide) and confirms that the toxicity of the 'water soluble' zirconium
sulfate and insoluble zirconium dioxide is very similar.
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