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Environmental fate & pathways

Phototransformation in air

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Description of key information

An atmospheric half-life t1/2 of about 3 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm is reported for thiourea.

Key value for chemical safety assessment

Half-life in air:
3 h

Additional information

Available literature on phototransformation of thiourea in air reports that the substance is degraded from 0.23% to 4.7% under the conditions of the GSF test (Schmidt-Bleek et al., 1982) and when irridiated at a wavelength of 290 nm (Freitag et al., 1985), respectively. The total test duration for these two experiments is however unknown.

In addition, Meylan & Howard (1993; as cited in the Hazardous Substances Data Bank) determined an atmospheric half-life t1/2 of about 3 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm.