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Environmental fate & pathways

Phototransformation in air

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Description of key information

A summary of information on photolysis from several sources in the literature is presented by the ECETOC Task Force in Volume I of the JACC No. 53 Report. 

Key value for chemical safety assessment

Additional information

Under normal environmental conditions, photolysis of cyanides is unlikely to occur, although in the presence of a catalyst such as titanium dioxide powder, cyanide can be photolytically oxidised to cyanate (ECETOC, 2007).

A range of degradation rate constant (K-OH) values was reported in Table 8 of the document, based on several literature sources for photo-oxidation only, and for photo-oxidation and oceanic uptake. The range of degradation constant values for photo-oxidation only is 0.002 x 1012 cm3/molecule/s to 0.1 x 1012 cm3/molecule/s.

A range of half-life values was reported in Table 8 of the document, based on several literature sources for photo-oxidation only, and for photo-oxidation and oceanic uptake. The range of half-life values for photo-oxidation only is 0.06 years to 11 years.