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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

Koc at 20 °C:
537

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 obtained (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 physico-chemical properties, this value is considered appropriate for read across to all streams in this category.

[LogKoc: 2.73]

[LogKoc: 2.73]