Registration Dossier
Registration Dossier
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EC number: 231-293-5 | CAS number: 7486-38-6
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
Based on the absence of data on biodegradability in soil, a read-across approach with adipic acid is applied. Adipic acid is readily biodegradable in soil.
Key value for chemical safety assessment
Additional information
For
disodium adipate no data on biodegradability in soil are available.
Therefore, data of the corresponding acid are taken into account for
assessment and a read-across approach is applied, based on the following
justification. 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.
Biodegradability of adipic acid in soil was assessed in a test conducted according to a national standard method of the U.S. Food and Drug Administration (FDA). An 84 % conversion of adipic acid carbon content to carbon dioxide was found after 30 days aerobic incubation in a sandy loam. 60 % degradation was reached in 1 to 6 d.
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