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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Koc = 18.5 (log Koc = 1.27; ECT, 2009)

Key value for chemical safety assessment

Additional information

In accordance with column 2 of REACH Annex VIII, an adsorption/desorption study does not need to be conducted since n-butyl acetate has a low potential for adsorption due to a low octanol-water partition coefficient (log Kow = 2.3; OXEA, 2009).

The adsorption coefficient (log Koc) was estimated to be less than 3 (MCI method: 1.3; Kow method: 1.8) using the KOCWIN (v2.00) program. The estimated Koc indicates that adsorption to soil is not to be expected.

The earlier version of this software (PCKOCWIN) is listed in the REACH Guidance document. 82% of the predicted log Koc values were within 0.5 Log units. The mean absolute error is 0.490 Log units. This error is acceptable.