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Environmental fate & pathways

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Aliphatic amines are strong bases and are protonated at environmental pH and, in consequence, due to the positive charge are prone to bind on negatively charged solid matter. This is demonstrated by the results for the read-across source substance from the available adsorption-desorption study (OECD 106): Accordingly, adsorption of MPMD to soil is quite strong (mean Kd of 338 L/kg; corresponding to indicative log Koc of 4.23), while binding to sediment is less pronounced but relevant (Kd 152 L/kg; corresponding to indicative log Koc of 3.18).


Due to the high primary and secondary pKa-values, MPMD will be present in the aqueous environment exclusively as a highly polar di-cation. Accordingly, any relevant volatility from water can safely be excluded.