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Sediment toxicity

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Description of key information

In the absence of measured data the PNECsed was calculated using the equilibrium partitioning method (EPM). 

Key value for chemical safety assessment

Additional information

In the absence of measured data the PNECsed was 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                   =      30.72 µg/L

                                                                                    Kpsusp                                  =      94000 L.kg-1

                                                                                    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              =      12.75 µg/L

                                                                                    Ksusp-water                            =      23500.9 m3.m-3

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

                                     PNECsed-EPM                      = 260.5 mg/kg ww

                                                                                 = 1198.3 mg/kg dw

                                     Applying the additional safety factor for exposure via ingestion: 10

PNECsed-EPM                     = 26.1 mg/kg ww

                                            = 119.8 mg/kg dw