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Sediment toxicity

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sediment toxicity: long-term
Data waiving:
other justification
Justification for data waiving:

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.

PNECsed derivation for sediment for Sodium diisobutylnaphthalenesulphonate using the EPM

In the absence of measured data the PNECsed 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 PNECsed is then calculated using the equations detailed in the TGD:

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


PNECaquatic       = 138 µg/L

Koc                            = 3162 L/kg

Focsoil                        = 0.02

Kd susp                      = FOCsusp-sed* Koc = 0.10 * 3162 =316.2 L/kg

Ksusp-water                 = 79.9 m3.m-3

RHOsusp                     = 1150 kg/m3

PNECsed-EPM            = 9.59 mg/kg ww

= 44.1 mg/kg dw

Key value for chemical safety assessment

Additional information