Registration Dossier
Registration Dossier
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EC number: 202-851-5 | CAS number: 100-42-5
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
No data on sediment toxicity are available. However, the substance is not persistent in the sediment compartment. The equilibrium partitioning method has been used for assessing the hazard to sediment organisms.
Key value for chemical safety assessment
Additional information
In Annex X of the Regulation (EC) No 1907/2006 REACH concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), it is suggested, that "long-term toxicity testing shall be proposed by the registrant if the results of the chemical safety assessment indicates the need to investigate further the effects of the substance and/or relevant degradation products on sediment organisms. The choice of the appropriatetest(s) depends on the results of the chemical safety assessment."
Styrene has a moderate potential for adsorption or bioaccumulation, is readily biodegradable and exhibits a strong tendency to volatilise from surface waters. Therefore exposure of sediment organisms is unlikely and testing towards sediment dwelling organisms is considered as not necessary.
Using the equilibrium partitioning method, the PNECsoil for styrene is calculated according to the TGD (EC 2003, part II, chapter 3, p. 117):
PNECsed = (Ksusp-water/ RHOsusp) • PNECwater • 1000
With the default parameters of the TGD concerning the fractions and densities in sediment as well as the substance parameters Koc = 352 L/kg and PNECwater = 0.028 mg/L, the PNECsediment for styrene is derived as follows:
PNECsediment = 0.24 mg/kg wwt = 0.614 mg/kg dwt
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