Registration Dossier
Registration Dossier
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EC number: 606-441-0 | CAS number: 201305-16-0
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
No experimental data evaluating the toxicity to sediment organisms is available for Benzoic acid, 4-hydroxy-, C18-22-alkyl esters (CAS No. 201305-16-0).
Benzoic acid, 4-hydroxy-, C18-22-alkyl esters exhibits a log Koc value of > 5 and is highly insoluble in water (< 0.05 mg/L). The Guidance on information requirements and chemical safety assessment, Chapter R7.b (ECHA, 2012) states that once insoluble chemicals enter a standard STP, they will be extensively removed in the primary settling tank and fat trap and thus, only limited amounts will get in contact with activated sludge organisms. Nevertheless, once this contact takes place, these substances are expected to be removed from the water column to a significant degree by adsorption to sewage sludge (Guidance on information requirements and chemical safety assessment, Chapter R.7a, (ECHA, 2012). Thus, discharged concentrations of this substance (if at all) into the aqueous/sediment compartment are likely to be low.
Considering this, one can assume that the availability of Benzoic acid, 4-hydroxy-, C18-22-alkyl in the sediment environment is generally low, which reduces the probability of chronic exposure of sediment organisms in general.
Once present in the aquatic compartment, due to the high log Kow, low water solubility and high adsorption potential, benzoic acid, 4-hydroxy-, C18-22-alkyl esters (CAS No. 201305-16-0) will be bioavailable to sediment organisms mainly via feed and contact with suspended organic particles. However, absorbed molecules of the substance will be metabolized and the metabolites will be excreted (for details see IUCLID section 7.1). This is supported by a calculated BCF value below 2000 L/kg. Furthermore, the available aquatic toxicity data show that no effects occur up to the limit of water solubility. Benzoic acid, 4-hydroxy-, C18-22-alkyl esters is unlikely to pose a risk for sediment organisms in general and testing is thus omitted.
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