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Sediment toxicity

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Description of key information

PNEC for bethic organisms can be calculated applying the equilibrium partitioning method using a Kpsed or Kdsed of 72.5 L/kg (or Koc of 1451 L/kg) this leads to a PNEC of 0.714 mg a.i./kd dw .

Key value for chemical safety assessment

Additional information

Coco fatty acids 2-sulfoethyl ester, sodium salt has a low to moderate sorption to soil and is readily biodegradable to CO2 and H2O and NO3. The PNEC sediment is calculated using the equilibrium paritioning method as no short or long-term benthic test data is available for Coco fatty acids 2 -sulfoethyl ester, sodium salt.

PNEC sediment based on EPM

In the absence of measured data the PNECsed can be provisionally 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 PNECsedis then calculated using the equations detailed in the TGD (2003):

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

Where:      

PNECaquatic dissolved = 4.8 µg/L

Ksusp-water = 37.2 m3/m3

RHOsusp = 1150 kg/m3(TGD, equ. 18)

PNECsed-EPM   = 155.3 µg/kg ww = 0.714 mg/kg dw