Registration Dossier
Registration Dossier
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EC number: 286-272-3 | CAS number: 85203-81-2
Endpoint summary
Administrative data
Description of key information
Additional information
Read-across approach
In the assessment of the environmental fate and pathways of hexanoic acid, 2-ethyl-, zinc salt, basic, 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, hexanoic acid, 2-ethyl-, zinc salt, basic will completely dissociate and only be present in its dissociated form, i.e. as zinc cation and 2-ethyl hexanoate anion.
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. No information is available on the stability constants of hexanoic acid, 2-ethyl-, zinc salt, basic, but predictions of stability of other zinc carboxylates (Zn propionate, Zn valerate, Zn isovalerate and Zn benzoate) in a standard ISO 6341 medium (2 mMCaCl2, 0.5 mM MgSO4, 0.77 mM NaHCO3 and 0.077 mM KCl, pH 6 and 8) clearly show that monodentate ligands such as carboxylic acids have no potential for complexing zinc ions in solution (Visual minteq. Version 3.0, update of 18 October 2012. http://www2.lwr.kth.se/English/OurSoftware/vminteq/index.html).
Upon dissolution and dissociation of hexanoic acid, 2-ethyl-, zinc salt, basic into Zn2+ and 2-ethyl hexanoate anion, 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 (Zn2+ and 2-ethyl hexanoic 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 and soil).
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