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Description of key information

No terrestrial test data is available for C16-18 (evennumbered, C18 unsaturated) alkyl bis(2-hydroxyethyl) amine oxide. The hazard for organisms living in the terrestrial compartment has been evaluated using the Equilibrium Partitioning Method.

Additional information

No terrestrial test data is available for C16-18 (evennumbered, C18 unsaturated) alkyl bis(2-hydroxyethyl) amine oxide. The hazard for organisms living in the terrestrial compartment has been evaluated using the Equilibrium Partitioning Method. A justification why the use of the EPM for this substance is considered justified is including in the sediment paragraph where the PNECsed based on EPM is compared to the PNECsed based real measured sediment data.

PNECsoil for C16-18 (evennumbered, C18 unsaturated) alkyl bis(2-hydroxyethyl) amine oxide

In the absence of measured data the PNECsoil can provisionally be calculated using the equilibrium partitioning method (EPM). According to the TGD this method uses the PNECaquatic and the sediment/water partitioning coefficient as inputs.

The PNECsoilis then calculated using the equations detailed in the TGD:

PNECsoil =   Ksoil-water* PNECaquatic dissolved* 1000 * 1 / RHOsoil

Where:

PNECaquatic dissolved             = 0.356 µg/L

Kd soil                         = 2271 L/kg

Ksoil-water                                      = 3406.5 m3/m3

RHOsoil                                          = 1700 kg/m 3

PNECsoil-EPM                             = 0.7134 mg/kg ww or = 0.806 mg/kg dw*

*without additional factor of 10 for strongly sorbing substances

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