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Environmental fate & pathways

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Additional information

C36 -alkylenediamines are for more than 99% protonated under environmental conditions. This means that they will behave as salts in water and will have a very low vapour pressure. The solubility of these waxy cationic surface active substances will be influenced by the pH and is difficult to determine because of the surface active properties. As an alternative as suggested by the REACH guidance R.7 the CMC at pH 7 was determined. Evaporation from water is based on the low vapour pressure and the observed CMC values very unlikely. The actual dissolved concentration in water will be extremely low as the C36 -alkylenediamines

will sorb strongly to sorbents both based on hydrophobicity and ionic interaction where the ionic interaction will govern the partitioning process.