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EC number: 263-372-5
CAS number: 62010-10-0
PNEC values calculated using assessment factors cannot be derived. In
the available acute ecotoxicity tests in fish and daphnids (performed
with similar water insoluble zirconium substances) no adverse effects
were observed up to and including the maximum loading rate of 100 mg/L.
In view of the extremely low water solubility of zirconium basic
sulfate, concentrations that would be toxic for aquatic organisms will
never be reached. In the available algal growth inhibition studies (also
performed with similar water insoluble zirconium substances), adverse
effects on growth were observed at the maximum loading rate of 100 mg/L,
however, the observed effects were concurrent with phosphate depletion
from the test medium, due to complexation with zirconium. This is hence
a secondary effect, which is not considered relevant under
environmentally realistic conditions.
Microorganisms in a sewage treatment plant are not expected to be
exposed to zirconium from zirconium basic sulfate, as zirconium basic
sulfate is insoluble. Therefore, exposure-based waiving of the endpoint
is allowed and no PNEC needs to be derived.
As no PNECaquatic could be derived, no PNEC values for soil and sediment
can be derived either by using the equilibrium partitioning method. No
toxicity data are available for sediment or soil organisms, except for a
short-term toxicity study with terrestrial plants, yielding only unbound
NOEC values for both an insoluble and two 'water soluble' zirconium
compounds. Therefore, no PNEC values for soil and sediment can be
derived applying the assessment factor method either. Since zirconium
basic sulfate is not considered hazardous to the environment, no
chemical safety assessment needs to be conducted and therefore no PNECs
need to be derived for these compartments.
No long-term toxicity studies to birds are available. A PNECsecondary
poisoning should not be derived because zirconium does not bioaccumulate
in the foodchain and because zirconium basic sulfate is not expected to
give rise to bioavailable zirconium in the environment. Furthermore, a
repeated dose toxicity study in rats (OECD 422) performed with the
'water soluble' zirconium substance zirconium acetate, did not observe
any significant adverse effects up to and including the highest tested
dose (NOAEL >= 1000 mg/kg bw/day, based on anhydrous test compound).
This study indicates that even 'water soluble' zirconium compounds are
not hazardous to organisms at higher levels in the foodchain.
The substance does not need to be classified for environmental hazards,
based on the available information for zirconium basic sulfate, used in
combination with information from read across substances. In none of the
studies used to cover the aquatic toxicity endpoints, adverse effects
have been observed up to and including the limit test concentration of
100 mg/L. Only for algae, growth inhibition was observed at this limit
test concentration for two read across substances, however, the observed
inhibition was concurrent with phosphate depletion from the test medium
(through heavy complexation with zirconium), and was hence considered a
phosphate deprivation effect, which is not considered relevant at a
normal environmental scale. Since there were no signs of primary
toxicity, the effect in algae was not considered relevant for hazard
assessment or classification purposes.
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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