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Toxicity to terrestrial plants

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Toxicity to terrestrial plants:
Conclusion: Results from 5-day plant toxicity studies show that DIDP, an analog to DIUP, does not cause toxicity at high soil concentrations as determined in natural and artificial soils. Studies are not available to asses the chronic toxicity of DIUP to plants. However, DIUP has been shown to be biodegradable, which suggests it will be degraded in the environment, and applications do not directly apply DIUP to soil. As acute studies in plants show no effects at high soil loading levels and acute and chronic studies with other terrestrial organisms also show no effects at the highest soil loading levels tested, chronic effects to terrestrial plants are not expected.

Key value for chemical safety assessment

Additional information

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 terrestrial plant toxicity of di-isoundecyl phthalate (DIUP; CAS #85507-79-5) ester are for di-isodecyl phthalate (DIDP; CAS #68515-49-1) ester, which is an analog to DIUP. Results of studies with DIDP suggest that DIUP will not cause toxicity to terrestrial plants at high soil loading levels. DIUP and DIDP both contain branched alkyl groups. 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 DIUP for this endpoint. The terrestrial plant toxicity dataset includes results for two species, Lolium species and Lactuca sativa.

Studies are not available to asses the chronic toxicity of DIUP to plants. However, DIUP has been shown to be readily biodegradable, which suggests it will be rapidly degraded in the environment, and applications do not directly apply DIUP to soil. As acute studies in plants show no effects at high soil loading levels and acute and chronic studies with other terrestrial organisms also show no effects at the highest soil loading levels tested, chronic effects to terrestrial plants are not expected. Additionally, guidelines on information requirements state that testing for soil organisms is not needed if a substance is readily biodegradable and is not directly applied to soil.