Registration Dossier
Registration Dossier
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EC number: 203-453-4 | CAS number: 107-02-8
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
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.
Key value for chemical safety assessment
Additional information
1. European Union Risk Assessment Report of Acrolein (EU, 2001)
Soil biodegradation tests
Two tests were conducted according to EPA Pesticide Assessment Guidelines. In the first test the biodegradability of acrolein in aerobic soil (sandy loam, pH 7.9) was studied. Half-life values of 4.2 hours and 410 days were found for unbound (73%) and bound acrolein, respectively. The half-life of the degradation products of acrolein, i.e. acrylic acid and 3-hydroxypropionic acid, to CO2 was found to be 29 days. It should be mentioned that this test deviated in several aspects from current EU- or OECD-guidelines. For instance, the microorganisms were adapted to acrolein and the storage conditions of soil were inappropriate. In the second test the biodegradability of acrolein in aqueous soil was examined under anaerobic conditions. The DT50 of acrolein was found to be 11 days. The half-life of the degradation products, i.e. 1,3-propandiol and 3-hydroxypropionic acid, to CO2 was calculated to be 80-110 days.
2. Agreement with further international Reports and Studies published after finalisation of the EU Risk Assessment Report 2001
US ATSDR (2007): Experimental data specifically pertaining to the degradation or transformation of acrolein in soil were not located. Results of studies in aquatic systems suggest that acrolein, at low concentrations, may be subject to aerobic biodegradation in soil or transformation via hydration followed by aerobic biodegradation of the hydrated product. Since acrolein is a very reactive compound, abiotic processes, such as oxidation or conjugation with organic matter in soils, may be the most important degradation processes. However, no information could be located for these possible acrolein reaction pathways in soil.
3. Substantial disagreements in comparison to further international Reports to European Union Risk Assessment Report 2001
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4. Additional aspects in further international Reports
None
5. Additional information in newer Studies, not included in the European Union Risk Assessment Report 2001 or further cited international reports
None
6. Conclusions
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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