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Environmental fate & pathways

Adsorption / desorption

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Description of key information

N-tallow alkyl derivates of 1,1'-[[3-[(3-aminopropyl)amino]propyl]imino]bis-2-Propanol adsorb firmly and completely to soil and are considered “immobile” or “non-mobile”.

Key value for chemical safety assessment

Koc at 20 °C:
33 037

Additional information

The Koc of the UVCB “N-tallow alkyl derivates of 1,1'-[[3-[(3-aminopropyl)amino]propyl]imino]bis-2-Propanol” was determined by the use of non experimental methods. As no single computational model could be identified which would fit exclusively to this task, the Koc eventually was calculated from the geometric mean of the data generated by two individual approaches.

The computations all were based on the experimentally derived log Kow > 6. The resulting log Koc is > 4.51 (Koc > 33’037 L/kg) and is considered reliable as it is supported from models, which mostly are based on real physical properties of the test item.

Concerning data interpretation of the resulting Koc, all available data uniformly are pointing in one direction and clearly indicate that has to be considered as “immobile” or “non-mobile” in soils or sediments according to the scales of McCall et al (1981) or Hollis (1991) respectively. These results are in accordance with the Full Public Report STD/1254 (November 2007) of the Australian authorities “National Industrial Chemicals Notification and Assessment Scheme” (NICNAS). Based on data from analogue materials N-tallow alkyl derivates of 1,1'-[[3-[(3-aminopropyl)amino]propyl]imino]bis-2-Propanol were assessed to adsorb ca. 100% to soils, while desorption is expected to affect initially about 5% and about 0% after replacement of the desorption solution.

 

For these reasons additional adsorption/desorption testing can not be expected to reveal new results with any added value concerning the risk assessment of this substance, thus additional studies on adsorption/desorption shall be waived.