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EC number: 238-694-4
CAS number: 14644-61-2
As soon as zirconium sulfate will come into contact with water it will
dissolve and hydrolyse under the release of sulfuric 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 sulfate 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.
Zirconium sulfate as well as its final hydrolysis product zirconium
dioxide are inorganic compounds and therefore not subject to
Under environmental conditions it is expected that instantaneous
hydrolysis of zirconium sulfate will occur with the formation of
zirconium dioxide or other insoluble zirconium complexes. Therefore, the
substance will not reach high concentrations in the aquatic environment,
hence bioavailability to and bioaccumulation in aquatic organisms can be
regarded as negligible. Furthermore, due to adsorption to organic and
inorganic particulate matter, zirconium will become unavailable for
sediment-dwelling organisms too. Based on experimental data available
for algae and cyanobacteria (read across from zirconium dichloride
oxide, another 'water soluble' zirconium compound), zirconium has no
potential to bioconcentrate/bioaccumulate in the aquatic foodchain.
Experimental data for terrestrial plants (experiments conducted with
zirconium dichloride oxide, zirconium acetate, and zirconium hydroxide,
i.e., two 'water soluble' and one 'insoluble' zirconium compound)
confirm that neither for the terrestrial foodchain there is a concern
Transport and distribution
Adsorption of zirconium compounds (as such) to particles of suspended
matter, sediment, or soil, is not expected to occur. It is rather the
zirconium cation (or potentially other cationic zirconium species) that
will adsorb to particulate matter. Therefore, the assessment of the
potential for adsorption and the derivation of adsorption coefficients
is element-based (not substance-based). Based on the derived Kp values,
zirconium can be concluded to strongly adsorb to particulate matter.
Therefore, its environmental distribution will be mainly to sediment and
soil, depending on the emission pathway under consideration. For
adsorption to occur however, zirconium has to end up in the aqueous
phase of the environmental compartment under consideration (water
column, or pore water in sediment/soil).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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