Registration Dossier
Registration Dossier
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EC number: 629-721-4 | CAS number: 308062-60-4
Endpoint summary
Administrative data
Description of key information
Additional information
Dialkyl amines are protonated under environmental conditions. This means that the protonated fraction will behave as salt in water and will have a very low vapour pressure. A vapour pressure of 0.002 Pa was measured for the Dialkylamine C16 -18 at 20 °C. The solubility of this cationic surface active substance is extremely low and 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 an attempt has made to measure the CMC at pH 7 and 23°C the CMC was however lower than 0.1 mg/L.
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 dialkyl amine C16 -18 will sorb strongly to sorbents both based on hydrophobicity and ionic interaction where the ionic interaction will govern the partitioning process. A refined sorption/desorption tests was performed for the dialkyl amine C16 -18 for three soils according to OECD 106. For silt soil a Kd of 14000 L/kg was observed indicating that once sorbed the substance has a low leaching potential. For risk assessment purposes Kd was recalculated to a Koc of 280000 L/kg despite the fact that there is no direct relationship between the sorption and organic matter content of a sorbent.
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