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EC number: 281-897-8
CAS number: 84057-80-7
In the assessment of the environmental fate and pathways of zirconium
propionate (CAS: 84057-80-7), a read-across approach from data for the
metal cation and the organic anion is followed. This read-across
strategy is based upon the assumption that upon release to the
environment and dissolution in aqueous media, zirconium propionate will
completely dissociate and only be present in their dissociated form,
i.e. as zirconium and propionate ions.
Upon dissolution in water, it is indeed predicted that metal
carboxylates dissociate completely into the metal cation and the organic
anion at environmentally relevant conditions. Information on the
stability constant of zirconium propionate predicts that in a standard
ISO 6341 medium (2 mM CaCl2, 0.5 mM MgSO4, 0.77 mM
NaHCO3and 0.077 mM KCl, pH 6 and 8) propionic acid has no
potential for complexing zirconium ions in solution (<1% of total metal
concentration complexed at 0.001 mM Zr; Visual minteq. Version 3.0,
update of 18 October 2012.
http://www2.lwr.kth.se/English/OurSoftware/vminteq/index.html). It is
further predicted that upon dissociation in water, the liberated
zirconium ion will immediately precipitate as ZrO2or Zr(OH)4,
resulting in extremely low dissolved zirconium concentrations.
Upon dissolution and dissociation of zirconium propionate into zirconium
and propionate ions, both constituent ions will each show its proper
(bio)degradation, bioaccumulation and partitioning behaviour in the
environment, as reported for the corresponding metal ion and carboxylic
acid (zirconium and propionic acid). The environmental fate and
behaviour for the metal and organic moieties is predicted to be clearly
different from each other, resulting in a different relative
distribution over the environmental compartments (water, air, sediment
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