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Sediment toxicity

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Description of key information

Toxicity to sediment organisms is not a standard information requirement in Annex IX. Therefore the equilibrium partitioning method has been used for the PNEC sediment derivation.

Key value for chemical safety assessment

Additional information

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

The PNECsed is then calculated using the equations detailed in the TGD


= Ksusp-water* PNECaquatic * 1000 * 1 / RHOsusp





PNECaquatic dissolved               

= 0.714 mg/L


= 0.908 m3/m3


= 1150 kg/m3(TGD, equ. 18)


= 0.564 mg/kg ww               


= 2.59 mg/kg dw