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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Low potential for adsorption. For environmental exposure assessment, adsorption is predicted using the TGD (Technical Guidance Document) non-hydrophobics log Kow prediction method (EC, 2003c). Log Koc = 1.48 for the hydrolysis product.

Key value for chemical safety assessment

Additional information

Adsorption has been estimated using two separate estimation methodologies: (1) KOCWIN (version 2) estimation using first-order Molecular Connectivity Index (MCI) and (2) estimation based on log Kowusing TGD (Technical Guidance Document) non-hydrophobics equation. Koc predictions based on log Kow and on MCI are both presented as neither method had been validated fully for this class of substance.The significance of the uncertainty in the Kocvalues predicted will be examined in the exposure assessment for this substance.

(3-chloropropyl)diethoxymethylsilane hydrolyses in contact with water to the corresponding silanol and ethanol,which have low log

Kow

values (<3) and thus have low potential for adsorption. Therefore, in accordance with Column 2 of REACH Annex VIII, the adsorption/desorption screening test does not need to be conducted for the silanol hydrolysis products.