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Environmental fate & pathways

Biodegradation in water: screening tests

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Biodegradation in water, screening tests: 43% (10mg/L) in 28 days  (OECD 301B)

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Additional information

The biodegradation rate at the lower test concentration is in accordance with the expected rate based on the assumption that the substance will hydrolyse rapidly to methanol, which would biodegrade rapidly (three of the six carbons in 3-chloropropyltrimethoxysilane hydrolyse rapidly to methanol). 3-chloropropylsilanetriol is not expected to biodegrade to any significant extent. The biodegradation rate at the higher test concentration is unexpectedly high, and can be disregarded.

This assumption 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).