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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Log Koc have been calculated for various representative components of these streams. The calculated values range from 1.46 — 4.71

Key value for chemical safety assessment

Additional information

A measured Koc is not available for any of the streams in this category. As the log Kow of some streams is >3 the adsorption/desorption endpoint cannot be waived. However, ECHA's Guidance on Information Requirements and Chemical Safety Assessment R7a Endpoint Specific Guidance (2008) indicates that before commissioning a new study alternative sources of data (e. g. QSAR) on the adsorption/desorption potential of a chemical should used. If the calculated Koc proves to be influential in the risk assessment then it may be necessary to conduct a new study.

Soil sorption of non-ionic substances can be estimated from their log Kow. Several QSAR have been developed that calculate the Koc of non-polar hydrocarbons on the basis of their log Kow (e. g. Sablijc and Gusten, 1995). The calculated log Koc are in the range 1.46 -4.71.