Registration Dossier

Ecotoxicological information

Sediment toxicity

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

No sediment test data is available for tallow di(2-hydroxypropyl)amine.

PNEC for bethic organisms can be calculated applying the equilibrium partitioning method using a Kpsed or Kdsed of 4526 L/kg (or Koc of 90520 L/kg) this leads to a PNEC of 2.2 mg/kd dw including the additional correction factor of 10 for additional exposure via ingestion.

Two valid long-term test have been performed on oleyl diethanolamine and are read across to  tallow di(2-hydroxypropyl)amine. One test is performed with Lumbriculus variegatus, an endobenthic worm, and resulted in an EC10 of 84.6 mg/kg dw and one with Caenorhabditis elegans which resulted in an EC10 of 219 mg/kg dw. From this endpoint a PNEC of 1.692 mg/kg dw can be calculated applying an assessment factor of 50. As the test substance is an ionic substance the reliability of the actual test is considered to be higher than the reliability of the EPM based PNEC.

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater sediment:
84.6 mg/kg sediment dw

Additional information

PNEC sediment based on EPM

In the absence of measured data the PNECsed can 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               =      2.8 µg/L

Kpsusp                              =      9052 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      =     2.465 µg/L

Ksusp-water                     =     2264 m3. m-3

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

PNECsed-EPM                 = 4.85 mg/kg ww

                                       = 22.3 mg/kg dw

 

                                    Applying the additional safety factor for exposure via ingestion: 10

PNECsed-EPM                = 0.49 mg/kg ww

                                      = 2.2 mg/kg dw

Two valid long-term test have been performed on oleyl diethanolamine and read across. One test is performed with Lumbriculus variegatus, an endobenthic worm, and resulted in an EC10 of 84.6 mg/kg dw and one with Caenorhabditis elegans which resulted in an EC10 of 219 mg/kg dw. From this endpoint a PNEC of 1.692 mg/kg dw can be calculated applying an assessment factor of 50. As the test substance is an ionic substance the reliability of the actual test is considered to be higher than the reliability of the EPM based PNEC.