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Environmental fate & pathways

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3-(Trimethoxysilyl)propyl-(2E,4E)-2,4-hexadienoate attained 42.6% biodegradation in 28 days in a reliable study conducted in accordance with OECD 301B (CO2 Evolution Method) and in compliance with GLP. The overall conclusion of this study is that the substance is not readily biodegradable.

3-(Trimethoxysilyl)propyl-(2E,4E)-2,4 -hexadienoate hydrolyses rapidly in water at pH 7 and 25°C (half-life 4.7 hours), producing three moles of methanol for each mole of parent material. The observed biodegradation can be accounted for mainly by degradation of methanol, which is readily biodegradable (OECD 2004). The silanol hydrolysis product 3-(trihydroxysilyl)propyl-(2E,4E)-2,4-hexadienoate is not expected to be readily biodegradable.

It is not necessary to obtain further information on biodegradation via simulation tests in water, sediment or soil for this Annex VIII registration.

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