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Additional information

DTDP and analogs of DTDP do not produce acute or chronic toxicity to earthworms or plants at high concentrations in soil. Since DTDP does not pose an acute or chronic hazard to the terrestrial compartment, it is not possible to derive NOECs or PNECs needed for quantitative risk assessment. However, it is possible to qualitatively conclude based on available effects test data that DTDP is not harmful to terrestrial organisms. 

I5 Summary

The data of the analogs used to characterize the terrestrial toxicity of DTDP are for DIDP (CAS #68515-49-1), which is an analog to DTDP. Results of studies with DTDP and DIDP suggest that DTDP will not cause toxicity to terrestrial organisms and plants at high soil loading 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 terrestrial organisms toxicity dataset includes results for an earthworm, Eisenia fetida, and the plant toxicity dataset includes results for five species, Lolium species, Lactuca sativa, Triticum aestivum, Brassica alba and Lepidum sativum.

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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