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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 from the available adsorption-desorption study (OECD 106): The bifunctional aliphatic amine HMD (2 amino groups) turned out to bind to soil and - to a lower extent - sediment.

A qualitative evaluation of hexamethylene diamine distribution using the fugacity calculation according to Mackay, Level III model shows that it is expected to be found mainly in the water compartment (more than 99%) and insignificantly in the air, soil and sediment compartments, when based on 1000 kg/h emissions to water only.

An estimation of Henry's Law Constant supports this conclusion with a value estimated between 3.26x10-4 Pa.m3.mol-1 and 7.15x10-5 Pa.m3.mol-1.