Registration Dossier
Registration Dossier
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EC number: 425-950-7 | CAS number: 187393-00-6
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
See discussion.
Key value for chemical safety assessment
Additional information
A method to derive environmental quality standards for soil or sediment from aquatic toxicity data and partitioning coefficients is the socalled equilibrium partitioning method (EqP-method). According to van Beelen et al. transformation of aquatic no effect concentrations to sediment concentrations can be expressed as log NOECsediment = Log NOECwater - 3 + log Kp (van Beelen P, Verbruggen EM, Peijnenburg WJ."The evaluation of the equilibrium partitioning method using sensitivity distributions of species in water and soil." Chemosphere. 2003 Aug;52,7:1153-62.). The Kp for organic compounds is normalized for the fraction of organic carbon in sediment (foc) in relation to the Koc: Kp = foc x Koc. The aquatic NOEC is expressed in ug/L while the resulting NOEC is expressed in mg/kg. For standard sediment the foc is 11.6%. Logaritmic transformation gives the following equation for standard sediment: Kp standard sediment = log Koc - 1.935. Based on the key values for Koc the following NOECs for standard sediment can be derived:
Log Koc |
Log Kp |
NOECsediment |
Unit |
5.7 |
3.764 |
4070 |
mg/kg |
6.8 |
4.864 |
51234 |
mg/kg |
This shows that the worst case NOEC is higher than 4070 mg/kg, a concentration far exceeding any possible environmental concentration. This means that there is no risk of environmental concentrations reaching levels toxic to sediment dwelling organisms. Therefore, further testing for sediment toxicity is waived.
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