Registration Dossier
Registration Dossier
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EC number: 937-237-2 | CAS number: 1370006-50-0
Endpoint summary
Administrative data
Description of key information
Additional information
The photodegradation of Partially unsaturated IQAC in air by reaction with OH radicals was calculated using EPIWIN v4.00, 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 hydroxyl 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.
Hydrolysis of the closely related homologue, oleic-acid based IQAC, DMS quaternised, proved to be rapid at neutral to alkaline pH values within a few days (2.9 days at pH 7 and 1.2 days at pH 9). At low pH the half-lives of Partially unsaturated based IQAC, DMS quaternised considerably longer (at pH 4: > 1 year at 25 °C). At pH 9 the half life was 1.2 days at 20 °C. With increasing temperature the hydrolysis rate increases to result in 27 hours 50 °C and 16 hours at 60 °C at pH 7, respectively. Partially unsaturated IQAC, DMS quaternised is expected to hydrolyse at the same rates, as the diffferences in chain length and number of double bonds are marginal.
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