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If Y-15099 (CAS 220727-26-4) is released into water it will hydrolyse to the hydrolysis products ethanol, octanoic acid and silanetriol, (3-mercaptopropyl)-. The log Koc for the hydrolysis products was calculated to be < 3 showing low potential for adsorption to soil and sediment particles (Müller, 2012). The parent substance will mainly participate to sediment particles since the log Koc of = 3.6 indicates a potential to be adsorbed by organic carbon but this is not considered to be relevant based on the rapid hydrolysis at environmental pH (Völkel, 2001).

Evaporation from water into air is negligible due to the low calculated Henry’s Law constant of < 1 for Y-15099 and its hydrolysis products. The hydrolysis product ethanol, which is expected to participate mainly to the atmospheric compartment is well characterized and the expected half-life was estimated to be 10 - 36 h. It's photochemical ozone creation potential is considered to be moderate to low (OECD, 2004). Thus, it is concluded that accumulation in air and transport through the vapour phase into other environmental compartments is not relevant. Air is not a likely route of environmental contamination and no accumulation is expected.

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