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Environmental fate & pathways

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Chemical stability of isooctyl acrylate relates to two abiotic degradation pathways, phototransformation in air and hydrolysis in water. Isooctyl acrylate undergoes indirect photodegradation by reaction with atmospherically produced hydroxyl radicals at an estimated reaction rate between 18.003E-12 and 22.116E-12 cubic meters per molecule per second. This yields an atmospheric half life of 1.45 to 1.78 days. These values indicate that isooctyl acrylate is not persistent in the atmospheric compartment.

Hydrolytic stability of isooctyl acrylate was not studied due to the fact that it is readily biodegradable as per adaptations to data requirements. In the key study isooctyl acrylate was found to be 93-95% degradable (using a 28-day OECD TG301D - Closed Bottle Test) and a supporting study concluded isooctyl acrylate was degraded 64-69% by day 28 of the study. Further, in both studies biologically mediated hydrolysis was essentially complete within five days. Abiotic hydrolysis of esters, by contrast, is a slow process. In the ready biodegradation studies, mercury-inhibited test vessels showed little (6.9%-30%) loss of the parent compound during the test period. Therefore, abiotic hydrolysis is not expected to contribute significantly to the fate of isooctyl acrylate.