Registration Dossier
Registration Dossier
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EC number: 231-293-5 | CAS number: 7486-38-6
Phototransformation in water
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. A liquid phase kinetic study on the ozonolysis and on the UV-induced ozonolysis of selected dicarboxylic acids, including adipic acid was performed, resulting in an ozone-dependent life time of about 13,000 years.
Key value for chemical safety assessment
Additional information
For disodium adipate no data are available and 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.
The ozonolysis of several dicarboxylic acids including adipic acid was measured in liquid phase to elucidate the fate of these acids in aerosols. In one series of experiments, ozone was produced in an ozone generator, in another series it was produced in the liquid phase by UV irradiation. Adipic acid concentrations ranged from 0.001 to 0.1 mol/l. Kinetics were determined by measuring ozone decay and carboxylic acid decay. The measured ozonolysis rate constant (k) for the adipic acid in 0.1 mol/l aqueous solutions was 1.7x10-3 L mol-1 s-1. The photoassisted ozonolysis rate constant was 2.8x10-3 L mol-1 s-1. The results indicate that ozonolysis and photoassisted ozonolysis are no significant removal pathways for adipic acid. The authors estimated the ozone-dependent life-time of adipic acid in air to be about 13,000 years, assuming an ozone mixing ratio of 100 ppbv, which is an upper limit for its summer time mid-latitude continental northern hemisphere values. For ozonolysis related conversion times are expected (Nepotchatykh, 2002).
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