Registration Dossier

Environmental fate & pathways

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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 (log Koc = 1.3; Koc = 18.5) using the KOCWIN v2.00 program. The estimated Koc indicates that adsorption to soil and suspended sediment is not expected.

 

The Henry's Law constant (HLC) of n-butyl acetate was experimentally determined to be 28.5 Pa*m³/mol at 25 °C. Therefore, slow volatilization is expected.

 

Taking the calculated Henry's Law constant of 28.5 Pa*m³/mol, volatilization half-lives of 3.3 and 127 hours were estimated by EPIWIN v4.00 for a model river and a model lake, respectively (ECT, 2009).