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Environmental fate & pathways

Phototransformation in soil

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Description of key information

Photodegradation of Cyprosulfamide in soil is relatively slow under irradiation conditions with a laboratory half life of 19.1 – 43.8 days.

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Soil photolysis of cyprosulfamide (S- und M-label) was investigated with artificial xenon light with a light energy of 683 W m-2in the wavelength range of 290 – 750 nm, a soil temperature of 20°C and a soil moisture of 75 % at 1/3 bar (Desmarteau, 2005). Continuous irradiation for 7.3 hours corresponded to one mean solar day in June at, Phoenix, Arizona, USA (geographical latitude: 33.26°N). Cyprosulfamide degraded relatively slowly under irradiation conditions with a laboratory half life of 19.1 – 43.8 days corresponding to a realistic half life in the range of 63 – 144 solar days under the mentioned conditions in, Phoenix, USA.