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Sediment toxicity

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Description of key information

Key value for chemical safety assessment

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Experimental data on the toxicity of 1,2-Benzenedicarboxylic acid, di-C16-18-alkyl esters (CAS 90193-76-3) to sediment organisms are not available. Acute and chronic toxicity test on aquatic organisms show that the substance is not toxic to aquatic organisms up to the limit of water solubility. Thus, toxicity to sediment organisms is not expected to be of concern.

Distribution to the environmental compartments, intrinsic properties and fate

1,2-Benzenedicarboxylic acid, di-C16-18-alkyl esters (CAS 90193-76-3) is not readily biodegradable (51.5% after 28 d (OECD 301 B). Thus the substance will not be degraded in sewage treatment plants. Nevertheless an extensive physical elimination of the substance in STPs is expected. The high log Koc (>10) and poor water solubility <0.05 mg/L) indicate that the substance will adsorb to solids and suspended material. 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.7b, (ECHA, 2012)). Thus, only limited concentrations of the substance will presumably be discharged to the aqueous/sediment compartment. Thus, due to the low expected environmental concentrations of the substance a chronic exposure of sediment organisms is unlikely.

If the substance is present in the aquatic environment it will presumably adsorb to solid particles and suspended matter due to the low water solubility and high log Koc. Thus sediment organisms may ingest the substance via food uptake. When ingested, the substance might be hydrolysed and the cleavage products can be further metabolized. However, a bioaccumulation of the substance is unlikely due to the high molecular weight and structural complexity of the substance. A low potential to bioaccumulate is also indicated by the low calculated BCF values of 0.89 L/kg ww (BCFBAF v3.01, Arnot-Gobas).
Furthermore the substance is considered to be not acutely or chronically toxic to aquatic organisms. Thus, 1,2-Benzenedicarboxylic acid, di-C16-18-alkyl esters (CAS 90193-76-3) is unlikely to pose a risk for sediment organisms in general and testing is thus omitted.