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EC number: 908-343-6
CAS number: -
The calcium peroxide that is present in the reaction mass of
calcium carbonate and calcium dihydroxide and calcium peroxide will
hydrolyze when it comes into contact with moist. As described in the
section on the environmental fate and pathways, the thus generated
degradation products are calcium dihydroxide and hydrogen peroxide. The
hydrogen peroxide will further decompose into oxygen and water. As a
consequence, for the assessment of the terrestrial toxicity, the effects
of calcium dihydroxide and hydrogen peroxide on terrestrial organisms
will be taken into account.
In the REACH registration dossier for hydrogen peroxide, it is
concluded that hydrogen peroxide undergoes fast decomposition in soil
and groundwater. This fast decomposition has been documented both in
case the initial concentration of hydrogen peroxide is relatively low
(close to naturally occurring concentration) and in case of much higher
concentrations (several 1000 -fold) which are applied in in situ soil
and groundwater remediation treatment.
For hydrogen peroxide a PNEC soil of 0.0019 mg/kg soil (wet
weight) or 0.0023 mg/kg soil (dry weight) is calculated using the
aquatic PNEC and the equilibrium partitioning method.
For calcium dihydroxide, reliable studies are available that
assess its toxicity to earthworms, plants (6 species) and
microorganisms. In the REACH registration dossier it was concluded that
adverse effects only occurred at high concentrations. This results in
the derivation of a PNEC soil of 1080 mg/kg soil dw.
One supporting study is available that examines the short-term
toxicity of calcium peroxide towards earthworms (Eisenia fetida). The
test was performed in line with the ISO 11268 -1 guideline. Even though
the experimental goal was to examine the effect calcium peroxide on the
remediation of soil contaminated with fluoranthenes and its toxicity
towards earthworms, the study nevertheless also contains a control run
in which earthworms were exposed to calcium peroxide only in an
uncontaminated soil. In this study, calcium peroxide was found to not
exert toxic effects on earthworms at the maximum tested concentration of
240 mg/kg soil d.w.
Furthermore, one supporting study is available on the effects of
calcium peroxide on the germination and seedling growth of rice seeds
that were coated with a pelleting agent mix under waterlogging
conditions, i.e. the seeds are sown and subsequently covered underneath
a 1.5 cm water layer. Calcium peroxide was found to improve the
germination and seedling growth compared with the untreated seeds, with
an optimum ratio of pelleting agent mix to rice seeds ranging
from 0.6:1 to 1:1. At higher ratios, a decrease of seedling growth was
observed with increasing calcium peroxide concentrations.
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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