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A measured pKa value of 4.1 is available for C12-14 AO. Dissociation constant is not expected to be affected to any great extent by the alkyl chain length and hence it is justified to read this value across to the C10 AO.Amine oxides are weak bases, showing either non-ionic or cationic behaviour in aqueous solution depending on pH. In acid solution, the cationic form [R(CH3)2N+-OH] is observed while in neutral and alkaline solution the non-ionic form predominates as the hydrate [R(CH3)2NO.H2O].

Due to the low vapour pressure (7.5E-05 Pa) and the low Henry’s law constant (3.72E-08 Pa.m3/mol) , atmospheric exposure will be low. The measured Koc of 1525 L/kg for C12-14 AO (which is read across to C10 AO) indicates that the substance will adsorb to soil and to suspended solids and sediment in water.

A Mackay Level III fugacity model predicts that release of the substance to the water compartment results in distribution exclusively to water (92.8 %) and sediment (7.2 %). Distribution to air and soil is negligible.

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