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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption coefficient (log Koc) was estimated by three QSAR models: 
- KOCWIN v2.00 in EPI Suite (v4.0) - MCI method using log Kow
- KOCWIN v2.00 in EPI Suite (v4.0) - log Kow method
- A model described in Technical Guidance on Risk Assessment (European Chemicals Bureau, 2003) - Part III, Chapter 4, table 4, equation for non hydrophobic substances
The estimated Koc of nopyl acetate (CAS 35836-72-7) is 1369 L/kg (geometric mean of three QSAR models: 953.9 L/kg, 1602 L/kg and 1678 L/kg).  The corresponding estimate log Koc is 3.136 (geometric mean of three QSAR models: 2.9795, 3.2048 and 3.2248)

Key value for chemical safety assessment

Koc at 20 °C:
1 369

Additional information

ECHA Guidance (chapter R.7.a, paragraph R.7.1.15) recommends to calculate the Koc endpoint value as the geometric mean of results obtained by means of QSAR models.

This geometric mean value is considered as the endpoint defining the substance potential for adsorption and can be used as input parameter for environmental risk assessment.

[LogKoc: 3.136]