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Environmental fate & pathways

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Releases into the environment may occur during production of dodecane-12-lactam as well as from its use as a monomer for polymer production. Furthermore, environmental releases are possible from residual contents of monomeric dodecane-12-lactam in the polymeric product during further processing of the polymer as well as during use and disposal of end products. Available information indicates that release from production is low.

According to a Mackay Level I model calculation, the main target compartment for dodecane-12-lactam will be the hydrosphere (92.3 %), followed by sediment (3.9 %) and soil (3.8 %). The calculated Henry’s law constant of 0.0010 Pa m3/mol indicates very low volatility of dodecane-12-lactam from surface waters.

In the atmosphere, dodecane-12-lactam is rapidly removed by reaction with hydroxyl radicals with a calculated half-life of 14.3 hrs. In water, it is not expected to hydrolyse at a significant rate under environmental conditions. Dodecane-12-lactam is readily biodegradable (OECD 301B: 83 % after 28 days). Thus in surface waters, the predominant removal mechanism is expected to be biodegradation. Experimentally determined BCF values below 2.6 l/kg (Cyprinus carpio) indicate a low bioaccumulation potential.

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