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Environmental fate & pathways

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A GLP-compliant ready biodegradation study following OECD 301F testing guideline is available for 1,3,5-trimethylbenzene (Dr Noack 2016). The study, which used a mixed inoculum of soil, non-adapted sludge and water showed that 1,3,5-trimethylbenzene is readily biodegradable but failing the 10 day window.The available data supports the conclusion that although 1,3,5-trimethylbenzene cannot be considered to be readily biodegradable, it is not expected to persist in the environment andwould not meet the screening criteria for persistence in the PBT assessment. Data from Atkinson (1990) also indicates that 1,3,5 -trimethylbenzene undergoes rapid phototransformation with a half-life of 7 hours in the environment.

1,3,5-trimethylbenzene has an experimental log Kow of 3.42 and is expected to have low potential for bioaccumulation, based on a calculated BCF of 161, and for adsorption to soil and sediment, based on a calculated Koc of 742. Structural analysis of the 1,3,5-trimethylbenzene molecule indicated that it is not expected to undergo hydrolysis in the environment due to the lack of hydrolyzable functional groups.

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