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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The following study has been submitted to address the biodegradation in water (screening test) endpoint:
Hanstveit, R. (2003). Dibutylbis[(1-oxododecyl) oxy]stannane (CAS# 77-58-7, dibutyltin dilaurate, DBTL): Determination of the ready biodegradability in a Manometric Respiration Test. Testing laboratory: TNO Nutrition and Food Research, Department of Environmental Toxicology. Report no.: TNO Report No. V4015/01. Report date: 2003-06-25.
The study has been allocated a Klimisch score of 1 and so is considered to be the key study for this endpoint.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The biodegradability of disbutylbis[(1 -oxododecyl)oxy]stannane (CAS # 77 -58 -7, dibutyltin dilaurate, DBTL) was determined as described under "Manometric Respirometry Test" in the OECD Guideline 301F for testing of chemicals: "Ready Biodegradability," using oxygen consumption as test criterion in a 39 day test. The test was extended to 39 days, because the plateau phase had not been reached after 28 days of incubation.

Disbutylbis[(1 -oxododecyl)oxy]stannane was degraded for 23% after 39 days. The 60% degradation criterion was not met and therefore, under the conditions required by OECD Guideline 301F, disbutylbis[(1-oxododecyl)oxy]stannane was considered not ready biodegradable.