Registration Dossier
Registration Dossier
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EC number: 937-237-2 | CAS number: 1370006-50-0
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
The photodegradation half- lives of Partially unsaturated IQAC, DMS quaternised in air by reaction with OH radicals are 1 and 0.9 hours, based on the reaction rate constant k(OH) =127.6 x 10E-12 cm³/molecule x sec (cis isomer) and k(OH) =135.2 x 10E-12 cm³/molecule x sec (trans isomer) and assuming a OH radical concentration of 5 x 10E5 radicals/cm³, respectively (EPIWIN v4.0, AOPWIN v1.92).
Key value for chemical safety assessment
Additional information
The photodegradation of Partially unsaturated IQAC, DMS quaternised in air by reaction with OH radicals was calculated using EPIWIN v4.0, AOPWIN v1.92. Based on the reaction rate constant k(OH) =127.6 x 10E-12 cm³/molecule x sec (cis isomer) and k(OH) =135.2 x 10E-12 cm³/molecule x sec (trans isomer) and assuming a OH radical concentration of 5 x 10E5 radicals/cm³ half-lives of 1 and 0.9 h, respectively can be calculated.
These half-lives indicate that the substance entering the atmosphere will be very quickly photodegraded by reaction with OH radicals. Due to the very low vapour pressure the substance under investigation will not be present in the gas phase in the atmosphere in appreciable amounts and therefore this elimination path will be only of minor importance.
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