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Environmental fate & pathways

Adsorption / desorption

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Description of key information

A realistic assessment of the Koc of the UVCB cannot be made with QSAR prediction.        
- limited bioaccumulation potency;
- low volatility;
- sorb strongly to organic surfaces;
- some of the constituents could be adsorb to soil particles.

Key value for chemical safety assessment

Koc at 20 °C:
1 082

Additional information

A realistic assessment of the Koc of the UVCB cannot be made due to the following three reasons:

·        Koc wascalculated by EPI Suite KOCWIN v 2.00 based on 2 different approaches: molecular connectivityindex (MCI) and log Kow.

·        There is a significant discrepancy in both predictions.The predicted byMCIKOCcoefficients range from510 to 6740 L/kg, while the predictions based onKOWare in the range from9 to 50 L/kg.

·        Most of the predictions are out-of-domain affecting their reliability.

 

Koc prediction is based on constituents B andD predictions from the MCI method shown in the table below. The Koc prediction is>1000 L/kg but bear in mind that the prediction for constituent D is out-of-domain.

 

Constituents

KOC, L/kg

Sub-domains

Domain

B

1082

In MW&Inst domain

In domain

D

6737

In MW domain

Out of -CN Inst domain

Out of domain

[LogKoc: 3.03]

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