Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Description of key information

DT50 (OH-radicals) = 7.626 hours (5x10^5 radicals cm-³; global 24-hours mean concentration) (Potassium sorbate)

Key value for chemical safety assessment

Half-life in air:
7.626 h

Additional information

For the submission of the biocidal dossier of Potassium sorbate, its half-life in air was estimated using the US EPA model AOPWIN. The results indicate that Potassium sorbate degrades rapidly in the atmosphere, reaching a DT50 of 2.575 hours for degradation by means of OH-radicals. The input parameters used for this calculation reflect conditions for a 12 -hours-day regarding the global annual average concentration of OH-radicals. Within the evaluation phase, the rapporteur member state Germany recalculated the photodegradation using a lower concentration of OH-radicals which reflects a 24 -hours day, which is the standard according to EU Guidance. Based on this re-calculation, the rapporteur estimated a photolytical half-life of 7.626 hours.