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EC number: 231-717-9
CAS number: 7699-43-6
The key study from O'Connor and Woolley (2010) demonstrated that upon neutralization of the test item solution containing zirconium dichloride oxide hydrolysis is able to continue towards completion and obtention of zirconium dioxide, which is insoluble.
One study is available (O'Connor and Woolley, 2010), in which the
hydrolysis of zirconium dichloride oxide was studied. The study was
assigned a Klimisch score of 2 (reliable with restricitons) because no
guideline was followed (extended water solubility study). The study
demonstrated that when dissolving zirconium dichloride oxide into water
rapid hydrolysis of the test item occurred with the liberation of
hydrochloric acid. Dissolution of the test item resulted in strongly
acidic solution pH. Overall the hydrolysis of zirconium dichloride oxide
is recognised as being incomplete in the presence of hydrochloric acid.
Under natural conditions however a significant buffering capacity will
exist and hence the hydrogen released will be absorbed; a decrease in pH
is therefore not expected. The hydrolysis of zirconium dichloride oxide
will thus continue and this immediate hydrolysis will form zirconium
dioxide which has an extremely low water solubility and will precipitate
out of the solution.
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