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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The log Koc of o-xylene estimated using a HPLC method is 2.73.

Key value for chemical safety assessment

Additional information

The log Kow of the xylene isomers and ethylbenzene ranges from 3.12 to 3.2 which suggests that they have the potential to sorb to soil and sediment. A reliable adsorption/desorption study with xylene or one of the other streams in this category as the test substance was not identified. However, a study using o-xylene that was conducted to a method equivalent to OECD 121 was (Hodson et al 1988). A range of compounds for which reliable K and Koc values were available were used to generate a regression equation that related retention time on the HPLC column to Koc value. This allowed the Koc of o-xylene to be estimated based on the measured K value. The log Koc of o-xylene fell within the calibration range. Based on similar physicochemical properties this is considered appropriate for read across to all streams in this category.

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