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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The following key study was provided to fulfil the data requirement:
Hanstveit Ir. R. (2003) 1,3,2-Dioxastannepin-4,7-dione, 2,2-dibutyl- (CAS # 78-04-6, Dibutyltin maleate, DBTM): Determination of the ready biodegradability in a Manometric Respiration Test. Testing laboratory: TNO, Project Organisation, Ecotoxicology, Utrechtseweg 48, P.O. Box 360, 3700 AJ Zeist, The Netherlands. Owner company: Organotin Environmental Programme (ORTEP) Association, Stabilizer Task Force. Report No.: V4017/01. Report date: 2003-09-24
The biodegradation of dibutyltin maleate was determined in a study performed in compliance with GLP and to the methods OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test) and EU Method C.4-D (Determination of the "Ready" Biodegradability - Manometric Respirometry Test). The study was considered reliable and adequate for assessment and accordingly assigned a reliability score of 1. The percentage degradation of 1,3,2-dioxastannepin-4,7-dione, 2,2-dibutyl- after 28 days of incubation was approximately 3% in a manometric respiration test at a test substance concentration of 37.7 mg.l-1, calculated from the Theoretical Oxygen Demand (ThODNH3) (1.38 mg of test substance. The biodegradation of 1,3,2-dioxastannepin-4,7-dione, 2,2-dibutyl- did not exceed the pass level of 60% ThODNH3 within 28 days and, therefore, is classified as not readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The key study Hanstveit Ir. R. (2003), was performed in compliance with GLP and to the guidelines OECD 301 F and EU Method C.4-D. The study was considered highly reliable and adequate for assessment and therefore assigned a reliabiltiy score of 1. Under the conditions of the test dibutyltin maleate was found to not be readily biodegradable.