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EC number: 812-724-1
CAS number: 106705-37-7
Biodegradation is not relevant for metals
and metal compounds. Thus, biodegradation
is not relevant for strontium.Neo-decanoic acid is not readily
biodegradable (11% biodegradation in 28 days) based on a standard OECD
test. Thus, data
available for the strontium cation and the neodecanoate anion indicate
that biotic degradation in respective compartments do not contribute
significantly to the fate of strontium neodecanoate in the environment.
carboxylates are substances consisting of a metal and a carboxylic acid.
Based on the solubility of strontium neodecanoate in water (8.47 g
dissolved Sr/L at pH 8.4 corresponding to 45.07 g strontium
neodecanoate/L), a complete dissociation of strontium neodecanoate
resulting in strontium and neodecanoate ions may be assumed under
environmental conditions. The
respective dissociation is reversible and the ratio of the salt
/dissociated ions is dependent on the metal-ligand dissociation constant
of the salt, the composition of the solution and its pH.
metal-ligand complexation constant of strontium neodecanoate could not
be identified. Data for alkaline earth metals appear to be generally
limited. However, alkaline earth metals tend to form complexes with
ionic character as a result of their low electronegativity. Further, the
ionic bonding of alkaline earth metals is typically described as
resulting from electrostatic attractive forces between opposite charges,
which increase with decreasing separation distance between ions. Based
on an analysis by Carbonaro & Di Toro (2007) of monodentate binding of
strontium to negatively-charged oxygen donor atoms, including carboxylic
functional groups, monodentate ligands such as neodecanoate are not
expected to bind strongly with strontium. Accordingly, protons will
always out-compete strontium ions for complexation of monodentate
ligands given equal activities of free strontium and hydrogen ions. The
metal-ligand formation constants (log KML) of strontium with
other carboxylic acids, i.e. acetic, propanoic and butanoic acid,
ranging from 0.78 to 0.89, further point to a low strength of the
monodentate bond between carboxyl groups and strontium.
it may reasonably be assumed that based on the estimated
strontium-neodecanoate formation constant, the respective behaviour of
the dissociated strontium cations and neodecanoate anions in the
environment determine the fate of strontium neodecanoate upon
dissolution with regard to (bio)degradation.
in the assessment of the biodegradation properties of strontium
neodecanoate, read-across to neodecanoic acid (CAS 26896-20-8; EC
248-093-9) and soluble strontium substances is applied since the ions of
strontium neodecanoate determine its biodegradability.
RF & Di Toro DM (2007) Linear free energy relationships for metal–ligand
complexation: Monodentate binding to negatively-charged oxygen donor
atoms. Geochimica et Cosmochimica Acta 71: 3958–3968.
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