Registration Dossier
Registration Dossier
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EC number: 248-372-5 | CAS number: 27253-30-1
Endpoint summary
Administrative data
Description of key information
The fate of lithium neodecanoate in the environment is most accurately evaluated by separately assessing the fate of its constituents lithium cations and neodecanoate anions.
Lithium
Abiotic degradation (e.g. hydrolysis) is not relevant for inorganic elements such as lithium. Lithium does not contain hydrolysable functional groups. Lithium as an element is not considered to be degradable.
Biotic degradation: Lithium as an element is not considered to be biodegradable.
Transport and distribution: Regarding transport and distribution in the environment, a median sediment-water partition coefficient of 3.88 (log Kp) was derived for lithium based on the FOREGS EU monitoring survey, i.e. measured lithium background concentrations of 720 paired European stream water and sediment samples. With median log Kd values of 2.93 and 1.84 for lithium partitioning in soil and suspended matter, respectively, lithium can be considered of overall low mobility in the environment.
Neodecanoic acid
Abiotic degradation: Abiotic degradation is not relevant for neodecanoic acid since it does not contain any components that can hydrolyse in water at environmentally relevant pH.
Biotic degradation: Neodecanoic acid is not readily biodegradable (11% biodegradation in 28 d) based on a standard OECD ready biodegradation test.
Bioaccumulation: According to a bioconcentration study, neodecanoic acid exhibits a low potential to bioaccumulate (BCF < 225 L/kg wwt fish).
Transport and distribution: The estimated logKoc of neodecanoic acid is 2.08 (Koc = 121 L/kg) and may be sensitive to pH. The vapor pressure is very low, i.e. 0.65 Pa suggesting a limited volatilization from soil. Henry’s Law constant for neo-decanoic acid is calculated with 0.54 Pa-m3/mole at 25 °C indicating that volatilization from water is not expected to occur at a rapid rate, but may occur. Neodecanoic acid is a weak organic acid with an estimated dissociation constant (pKa) of 4.69. Consequently, neodecanoic acid, at neutral pH, typical of most natural surface waters, is expected to dissociate to the ionised form and to remain largely in water.
Additional information
Metal carboxylates are substances consisting of a metal cation and a carboxylic acid anion. Based on the solubility of lithium neodecanoate in water, dissociation of lithium neodecanoate (at least to some extent) resulting in lithium cations and neodecanoate anions 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.
Ionic lithium (Li+) at relevant pH conditions (pH 6 - 10) of aquatic and terrestrial environments will rapidly transform to lithium-oxide and -hydroxide complexes. Therefore, lithium is expected to have a lower mobility and bioavailability under most environmental conditions whereas neodecanoate is rather mobile.
Thus, it may reasonably be assumed that the respective behaviour of lithium cations and neodecanoate anions in the environment determine the fate of lithium neodecanoate upon dissolution with regard to (bio)degradation, bioaccumulation, partitioning resulting in a different relative distribution in environmental compartments (water, air, sediment and soil) and subsequently its ecotoxicological potential.
Thus, in the assessment of environmental fate and pathways of lithium neodecanoate, read-across to the assessment entities lithium ions and neodecanoate is applied since the individual ions of lithium neodecanoate salts determine its environmental fate and toxicity. Since lithium ions and neodecanoate ions behave differently in the environment, regarding their fate and toxicity, a separate assessment of each assessment entity is performed. Please refer to the data as submitted for each individual assessment entity. For a documentation and justification of that approach, please refer to the separate document attached to section 13, namely Read Across Assessment Report for lithium neodecanoate.
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