Registration Dossier
Registration Dossier
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EC number: 203-453-4 | CAS number: 107-02-8
Endpoint summary
Administrative data
Description of key information
Additional information
Despite the lack of a well-performed ready biodegradability test, it is expected that acrolein will be completely mineralised within 3 weeks because of rapid primary degradation of acrolein within 7 days and no stable metabolites are formed. In addition, the outcome of two different QSAR calculations (BIODEG and OECD-model 75; Rorije et al., 1997) also point to the ready biodegradability of the substance. Based on the entire data set on biodegradation and the QSAR estimates, acrolein will be considered in the current risk assessment as ready biodegradable with a biodegradation rate constant of 1 h-1 (STP).
Insufficient data are available regarding anaerobic biodegradation to establish the significance of this process as a removal mechanism or to determine the rate at which such a process would proceed.
In sediment/water systems, acrolein undergoes hydrolysis, self-oxidation, and biodegradation. Experimental half-lives of 7.6 h and 10 days were determined for aerobic and anaerobic conditions, respectively. An overall reactivity-based half-life is estimated to be between 100 and 300 h. Because of its low organic carbon/water partition coefficient (Koc) and high water solubility, acrolein is not expected to significantly adsorb to suspended solids or sediments, nor are these suspended solids or sediments expected to significantly absorb acrolein from water.
A soil DT50 of 4.2 hours could be used in the exposure assessment of acrolein. However, it should be noted that this value is derived from less reliable data. As a conservative approach the default value of the TGD (30 days) will be used. In the risk characterisation for the terrestrial compartment reference will be made to the measured value of 4.2 hours.
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