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Biodegradation in water: screening tests

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Description of key information

Y-15099 is not readily biodegradable according to the OECD criteria (mean biodegradation: 57% after 28 days).

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

The test item Y-15099 (CAS 220727-26-4) was investigated for its ready biodegradability according to the OECD Guideline 301 F under GLP conditions (Grützner, 2001). Activated sludge was used as inoculum and the test substance was applied in a concentration of 100 – 104 mg/L. The O2 consumption was monitored for 28 days. The test substance was degraded to 57% (mean) at the end of 28 days, and to 45% at the end of the 10-day window. A toxicity control revealed that the test item has no inhibitory effects on the activated sludge microorganisms (biodegradation > 50% after 14 days).

Since the test substance is hydrolytically unstable the observed result mainly reflects the biodegradation of the hydrolysis products. Ethanol, one product of hydrolysis, is readily biodegradable (OECD, 2004). Therefore, the result of this study is probably based on the hydrolysis product Silanetriol, (3-mercaptopropyl)- which is expected to be not readily biodegradable.


References: OECD (2004): Ethanol. SIDS Initial Assessment Report For SIAM 19, Berlin, Germany, 19 - 22 October 2004. UNEP publications.