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Description of key information

PNEC for bethic organisms is calculated applying the equilibrium partitioning method using a  Koc of  21 L/kg)

Key value for chemical safety assessment

Additional information

PNEC sediment-freshwater

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 PNECsedis calculated using the equations detailed in the TGD:

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


PNECaquatic      =     0.095 mg/L SCN- (0.125 mg/L NH4SCN)

Ksusp-water           =    1.425 m3.m-3

Koc                     =    21 L/kg

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


Conversion factor from mg/kg/ww to mg/kg/dw = 4.607


PNECsed-EPM  = 0.1177 mg/kg ww = 0.5423 mg/kg dw