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Sediment toxicity

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Description of key information

No ecotoxicity data for the sediment compartment is available for branched triamine C16-18 and the PNEC for the benthic compartment is therefore calculated applying the Equilibrium Partitioning Method (EPM)

Key value for chemical safety assessment

Additional information

In the absence of measured data the PNECsedcan provisionally be calculated using the equilibrium partitioning method (EPM). According to the TGD this method uses the PNECaquaticand the sediment/water partitioning coefficient as inputs. However, since the available PNECaquaticis based on the bulk concentration present in surface water a re-calculation is necessary first:

                                     PNECaquatic, dissolved                         =        PNECaquatic bulk/ (1 + Kpsusp* SUSPwater* 10-6)

                                                              Where:        PNECaquatic bulk                =      320 µg/L

                                                                                    Kpsusp                      =      100000

                                                                                    SUSPwater                  =      15 mg.L-1(TGD)

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

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

                                                              Where:        PNECaquatic dissolved           =      12.8 µg/L

                                                                                    Ksusp-water                  =      25000 m3.m-3

                                                                                    RHOsusp                    =      1150 kg.m-3(TGD, eq. 18)

                                     PNECsed-EPM                     = 27.8 mg/kg ww = 128 mg/kg dw

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