Registration Dossier
Registration Dossier
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EC number: 231-293-5 | CAS number: 7486-38-6
Endpoint summary
Administrative data
Description of key information
Additional information
In aqueous media, disodium adipate and adipic acid acid dissociate
into the corresponding anion (1,6-hexandioic acid ion) and the sodium
ion and hydrogen ion (proton), respectively. Fate, behavior and the
ecotoxicological properties of adipic acid and its disodium salt are
thought to be an effect of the di-carboxylate ion rather than of the
sodium ion or the hydrogen ion (proton), which are normal constituents
in environmental systems and have no relevant ecotoxic properties in low
concentrations.
Therefore a read-across between disodium adipate and adipic acid is
justified.
It has to be considered, that based upon its pKa-values, adipic acid as well as disodium adipate are mostly present as anion (i.e. deprotonated) under environmental pHs. As anions are neither subject to volatilization nor to adsorption, the hydrosphere is also the target compartment for the deprotonated molecule.
Due to the low vapour pressure and the low Henry´s law constant of 0.0616 Pa m³/mole, adipic acid as well as disodium adipate are expected to be distributed mainly to the aqueous compartment if released to the environment.
The estimated Koc values for adipic acid, using different accepted calculation methods are 2.4, 5.3 and 21.5, indicating that the substance is not expected to adsorb neither to suspended solids and sediment in water nor to soil. This is in good agreement with the calculated log Kow values for the dissociated and non-dissociated form of disodium adipate.
The distribution of adipic acid in a "unit world" was calculated according to the Mackay fugacity model level I (Currenta, 2009) based on the physico-chemical properties. The main target compartment for adipic acid is water with 97.89%, followed by air with 2.09 %, and minor amounts for soil and sediment. Based on the results for adipic acid, it is conluded that also the main target compartment of disodium adipate is water.
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