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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Due to the cationic surface-active properties will Amides, C18-unsatd., N-[3-(dimethylamine)propyl] adsorb strongly onto the solid phase of soil and sediments. The substance can adsorb both onto the organic fraction and, dependent on the chemical composition, onto the surface of the mineral phase, where sodium and potassium ions can be exchanged against the alkyl ammonium ion. The determination of a Koc from log Kow is not opportune, because the common equations for Koc derivation are not valid for both ionic and surface active substances. Therefore not the Koc values should be evaluated but the Kd values. Therefore the Kd values are reported and not the Koc values. 
Kd values range from 2500 to 4500 L/kg with an average of 3300 L/kg.

Key value for chemical safety assessment

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
3.5

Additional information

The adsorption/desorption behaviour of Amides, C18-unsatd., N-[3-(dimethylamine)propyl] on soils was evaluated in a study performed in accordance with OECD testing guideline 106 and GLP requirements. At the test conditions the adsorption coefficient Kd was found to be in the range of 2500 to 4500 L/kg in the different soils tested. Consequently, with an average of 3300 L/kg, the test substance is considered to be strongly sorptive to soil/sediment particles.