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EC number: 233-138-7
CAS number: 10043-27-3
trinitrate is registered as an intermediate under strictly controlled
conditions for a tonnage
inferior to 100 t/y.
Therefore, the data requirement is to submit the available existing
information. Considering the importance of those parameters in the
determination of environmental classification, biotic/abiotic
degradation and bioaccumulation were further investigated:
to column 2 of REACH Annex VII, the study does not need to be
performed for inorganic substances as terbium trinitrate.
According to REACH Annex XI, testing for a
specific endpoint may be omitted if testing does not appear to be
scientifically necessary or if it is technically not possible to
conduct the study as a consequence of the properties of the substance.
Under REACH (ECHA 2016, Chapter R.7B - Endpoint Specific Guidance),
the term "hydrolysis" refers to the "decomposition or degradation of a
chemical by reaction with water", and this as a function of pH. In the
case of inorganic substances, like terbium trinitrate, the assessment
of environmental fate is generally based on the elemental
concentration, regardless of the element's speciation which depends on
the prevailing environmental conditions. In other words, formation of
different terbium species may occur in the environment, but
discriminating those species will add no value to the environmental
fate assessment. The element-based evaluation (pooling all speciation
forms together) can be effectively considered as a worst-case
assumption. As a result, abiotic processes, like degradation or
transformation by reaction with water, are irrelevant for inorganic
substances as long as they are assessed on an elemental basis.
bibliographical review based on ca. 60 publications
(1964-2016), containing information on the accumulation of
terbium, the rare earth element under consideration in this
yttrium and/or zirconium in aquatic organisms, was written to cover
this endpoint. Because of the similarity between findings for the
elements under consideration and those for (other) metals, such as
the influence of environmental conditions on bioaccumulation, the
observation of inverse relationships between bioaccumulation values
and concentrations in water, and the evidence for the existence of
internal regulatory mechanisms, the bioaccumulation thresholds (e.g.
for classification) used for organic substances are considered
not applicable, and the evaluation of aquatic bioaccumulation was
evaluated through expert judgment. This has led to the following
considerable decrease of bioaccumulation was observed when ascending
the trophic levels, this being obvious when comparing data in fish
to those in lower trophic levels.
yttrium and zirconium do not biomagnify through the aquatic food web.
on this pool of evidence, it was concluded that lanthanides, yttrium
and zirconium are unlikely to biomagnify in predatory organisms or
humans exposed via the environment.
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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