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Environmental fate & pathways

Phototransformation in water

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Description of key information

Phototransformation in water: DT50 = 5-9 days (EPA Guideline Subdivision N 161-2 (Photodegradation Studies in Water))

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Additional information

According to the classification scheme by Mensink, trans-2-Ethylhexyl 4-methoxycinnamate can be regarded as being very rapidly degradable when transition to cis-2-Ethylhexyl 4-methoxycinnamate is taken into account.

When trans-cis transition is left out, 2-Ethylhexyl 4-methoxycinnamate can be classified as fairly degradable with a DT50 in the range of ca. 5-9 days. The main photolytic degradation products are p-methoxycinnamate (34.8% applied initial substance), unidentifiable substances M1 and M3 (according to TLC method I) or MA, MB and MD (according to TLC method II). The quantum yield for the trans-to-cis conversion was 0.0021. The quantum yield for the degradation into metabolites appeared to be in the range of 1*10^-5 to 2*10^-5.

It is concluded that the test substance is fairly degradable by phototransformation in water.