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Environmental fate & pathways

Phototransformation in air

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Description of key information

The substance is not volatile. Even if it would reach the air it would be rapidly degraded by reaction with photogenerated hydroxyl radicals with a DT50 of 4 hours. 

Key value for chemical safety assessment

Additional information

Using the effusion method (vapour pressure balance) the vapour pressure for cyprosulfamide was estimated to be < 0.00001 Pa at 20 °C (OECD 104) indicating that cyprosulfamide is non-volatile and therefore will not reach the atmospheric compartment of the environment by volatilisation.

The stability in air was estimated by AOPWIN v1.92 (Knoell Consult, 2011a) based on the increment method of Atkinson for the reaction of an organic molecule with atmospheric hydroxyl radicals. Assuming a mean concentration for the hydroxyl radicals of 1.5 x 106cm-3for 12 hours per day the degradation half-life in air is approximately 4 hours.

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