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EC number: 233-520-3
CAS number: 10213-78-2
Primary fatty amine ethoxylates have pKa
values close to 8.8 which is most likely almost independent of the alkyl
chain length as observed for primary alkyl amines. This means that the
largest fraction of the molecule is protonated under environmental
conditions and will behave as salt in water. A vapour pressure of
0.00073 Pa was measured for the C12 -18 ethoxylated amine at 20 °C and
which will be used as a worst-case for the primary fatty amine
ethoxylates with a longer alkyl chain. The solubility of this cationic
surface active substance 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.
For primary fatty amine ethoxylates CMC
values ranging from 3.5 to 5.9 mg/L were measured. 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 ethoxylated amines will sorb strongly to sorbents both
based on hydrophobicity and ionic interaction where the ionic
interaction will govern the partitioning process. For silt soil a Kd of
4526 L/kg was observed indicating that once sorbed the substance has a
low leaching potential.
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