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Sediment toxicity

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Description of key information

Sediment toxicity:
Conclusion: Results from short-term toxicity studies with an analog substance with 2 sediment invertebrates show that DTDP does not cause toxicity at the high concentrations investigated in these tests.

Key value for chemical safety assessment

Additional information

The results of short-term toxicity studies reported as NOEC values for sediment toxicity. The NOEC values from these studies represent the highest concentrations tested and measured under the conditions of the studies.

I5 Summary

The data used to characterize the sediment toxicity of di-isotridecyl phthalate (DTDP) ester are for di-isodecyl phthalate (DIDP; CAS #68515-49-1) ester, which is an analog to DTDP. Results of studies with DIDP suggest that DTDP will not cause toxicity to sediment dwelling organisms at high levels. Therefore, because of the structural similarity between these substances and the similar biological behavior of high molecular weight phthalate esters in general, data for the analog can be used to characterize the biological effects of DTDP for this endpoint. The sediment toxicity dataset includes results for three species, Chironomus tentans, Hyalella azteca, and Rana arvalis.

Justification for read-across:

The High Molecular Weight Phthalate Ester (HMWPE) Category consists of phthalate esters with an alkyl carbon backbone with 7 carbon (C7) atoms or greater. The category is formed on the principle that substances of similar structure have similar toxicological properties. The data available on high molecular weight phthalates demonstrate that members of this category have similar biological activities and toxicological properties; verifying the use of read-across data as an appropriate approach to characterize endpoints. Both substances named DTDP are high molecular weight phthalate esters (C13), diisotridecyl phthalate (CAS number 27253-26-5, EC number 248-368-3) and 1,2-Benzenedicarboxylic acid, di-C11-14-branched alkyl esters, C13-rich (CAS number 68515-47-9, EC number 271-089-3). Both are isomeric mixtures of C13 branched alkyl esters, the starting material being different but both starting materials consisting of C13 branched alcohols. Where data maybe lacking for DTDP, DINP (C9) and DIDP (C10), which are also high molecular weight phthalate esters, are used as read-across substances to provide toxicological information.

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