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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Biodegradation in water, screening tests:  The hydrolysis product 3-chloropropylsilanetriol is not expected to undergo any significant biodegradation.

Key value for chemical safety assessment

Additional information

No data are available for the submission substance, trichloro(3-chloropropyl)silane. However, trichloro(3-chloropropyl)silane hydrolyses very rapidly in contact with water to give 3-chloropropylsilanetriol and hydrogen chloride.

A reliable study conducted according to an appropriate test protocol (EU C4 -C), and in compliance with GLP is available for the related substance triethoxy(3-chloropropyl)silane. It is considered appropriate to read across the ready biodegradation result for triethoxy(3-chloropropyl)silane because the hydrolysis half-life (35hrs, measured result) indicates that, under conditions relevant to ready biodegradation assessment, it will hydrolyse to 3-chloropropylsilanetriol.

This is selected as the key study. The result from this study is likely to represent biodegradation of ethanol, which is expected to biodegrade rapidly, and consists of 6 of the 9 carbons in the chemical structure. Therefore, 3 -chloropropylsilanetriol is not expected to undergo any significant biodegradation.

This is supported by evidence that within a category of small molecule silicon-dominated organosilicon compounds, without reactive functional groups in the side chain, there is no evidence of any significant biodegradation in ready biodegradation tests (Data gap filling report for ready biodegradability of silicon-dominated substances PFA.151.004.022A).

Biodegradation is not relevant for hydrogen chloride as it is inorganic.