Registration Dossier
Registration Dossier
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EC number: 252-488-1 | CAS number: 35285-69-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable: 91.5% (ThOD) in 28 days (OECD 301 F)
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
No studies investigating the biodegradability of sodium propylparaben (CAS 35285-69-9) are available. Therefore, biodegradation data of the corresponding acid propylparaben (CAS 94-13-3) are used as read across.
This read across approach is in accordance with Regulation (EC) No 1907/2006, Annex XI, 1.5. Grouping of substance and read across approach as is explained within the analogue justification in section 13. Except for different cations (hydrogen vs. sodium) the anions of both the source and target substance have identical chemical structures. Since dissociation of the sodium salt under environmental conditions (pH 4 - 9) yields the same ionic species as the acidic form of the substance, this read across can be considered as justified.
For the analogue read across substance propylparaben, biodegradation data from studies are available.
Data on the biodegradability of propylparaben (CAS 94-13-3) are presented in the dossier “Environmental and Health Assessment of Substances in Household Detergents and Cosmetic Detergent Products” by the Danish Ministry of Environment and Energy. Herein, results from a study according to OECD guideline 301 F are cited. In this test, 20 mg/L propylparaben were incubated for 28 days and a valid reference control was included. Based on the theoretical oxygen demand, propylparaben attained 91.5% degradation in 28 days and can therefore be classified as readily biodegradable according to OECD criteria. Additionally data on anaerob degradation were presented in the dossier. The results show that the test item is not biodegradable under anaerobic conditions.
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