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Environmental fate & pathways

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Regarding transport and distribution, information about soil adsorption of monomethylamine as well as a calculation for the Henry´s Law Constant of the substance are available. No adsorption to soil was found according to OECD guideline 106 (Koc (soil) 389 and Koc (sediment) 449; von Oepen et.al., 1991). The soil adsorption coefficient was calculated by EPIWIN (2008). A Koc value of 8.098 L/kg was predicted using the MCI method and a Koc value of 3.873 L/kg was predicted with the Kow method.

This is still in accordance to the prediction by Hansch and Leo (1985): Koc = 10.74 and 12, respectively. Also desorption coefficients were experimentally investigated by Wang and Lee (1993). The scientists used montmorillonite, kaolinite, as well as marine sediment as test substrates and found different coefficients according to the different soil types.

The Henry´s Law Constant for the uncharged molecule of monomethylamine was calculated by the US-EPA computer tool EPIWINv3.20 (Chemservice S.A., 2010). The Bond Estimation resulted in a value of 0.768 Pa*m³/mol and the Group Estimation gives a result of 0.731 Pa*m³/mol at a temperature of 25 °C. Beside the fact that no information is required about the Henry´s Law Constant under REACH regulation, the value will possibly be important to calculate the PNECsoil value. Due to this the calculation is performed for completeness.