Registration Dossier
Registration Dossier
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EC number: 245-152-0 | CAS number: 22673-19-4
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation
No determination was possible according to Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004, for the following reason:
- During preliminary investigations for the water solubility test, it was concluded that the test item hydrolyses immediately upon contact with water. Substances which hydrolyse rapidly in contact with water are not suitable for determination using Method 111.
In accordance with Annex XI section 2 of the Regulation EC 1907/2006, testing for a specific endpoint may be omitted, if it is technically not possible to conduct the study as a consequence of the properties of the substance.
In the water solubility test, on removal from the 20°C water bath the sample consisted of a hazy white suspension of white chalky particles with much adhering to the flask. The test item therefore hydrolyses immediately on contact with water to an insoluble solid. All dibutyltin compounds degrade into dibutyltin and the appropriate ligand, the white solid observed in the test is probably DBTO, which is known to be insoluble.
Biotic degradation
All dibutyltin compounds degrade into dibutyltin and the appropriate ligand, and so, on this basis, it is possible to read-across between the different dibutyltin compounds to address the biodegradation in water: screening tests endpoint. The requirement for screening data has been addressed by using the weight of evidence approach reading across from data conducted on other dibutyltin compounds. This approach shows that dibutylbis (pentane-2,4 -dionato-O, O') is not readily biodegradable. Simulation tests are not available. In the absence of such information dibutylbis (pentane-2,4 -dionato-O, O') is concluded to be stable to biodegradation.
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