Registration Dossier
Registration Dossier
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EC number: 231-293-5 | CAS number: 7486-38-6
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Based on the absence of data for disodium adipate, results from the corresponding acid are taken into account for this endpoint.
In the atmosphere a half-life of 2.9 d for adipic acid is estimated due to reaction with photochemically produced hydroxyl radicals, considering an OH-concentration of 500,000 radicals/cm³ as a 24-h average.
Key value for chemical safety assessment
- Half-life in air:
- 2.9 d
Additional information
Based on the absence of data, a read-across approach with adipic
acid is applied. 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.
As no data on phototransfromation in air for adipic acid are available, the rate constant for the atmospheric gas-phase reaction between photochemically produced hydroxyl radicals and organic chemicals is estimated with the Atmospheric Oxidation Program (AOPWIN) of US Environmental Protection Agency. The rate constant is then used to calculate the atmospheric half-life. A 24-hour day and an OH radical conc. of 500,000 OH/cm3 are assumed for calculation.
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