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Environmental fate & pathways

Phototransformation in water

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Description of key information

Two studies were provided for this endpoint:
In the Saxena, 1987 study, Dinoseb at a concentration of 28 mg/L was photodegraded in the buffer solution pH 7 for 17 days at 25 ºC.
Half-life (DT50):
t1/2: 33.3 d (Continuous light (24 hours sunlight/day))
t1/2: 66.6 d (Natural light (12 hours sunlight/day))
Transformation products: yes, at least two photoproducts were detected
In the Blair, 1986 study, Dinoseb at concentrations of 5 and 10 mg/L was irradiated in the buffer solution (pH 7) using artificial as well as natural sunlight. Dinoseb was photodegraded rapidly under natural sunlight conditions when compared with the artificial sunlight.
Half-life (DT50):
t1/2: 12 to 18 days (Natural sunlight (12 hours light/day))
t1/2: 102 d (Artificial sunlight results extrapolated to natural conditions)
Transformation products: At least 8 photodegradation products were detected

Key value for chemical safety assessment

Additional information

These studies were entered for assessment purposes only and are not considered necessary for REACH purposes.

Both supporting studies were assigned a reliability rating of 1, according to the criteria of Klimisch, 1997 as the studies were conducted according to standard methodology with analytical verification of test concentrations and GLP.