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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 DTDP, does not cause toxicity at high soil concentrations as determined in natural and artificial soils. Results from a 14-day study on seedling emergence and growth show no effects from DTDP. These results provides evidence for the lack of chronic toxicity of DTDP to plants. Also, DTDP has been shown to be biodegradable, which suggests it will be degraded in the environment, and applications do not directly apply DTDP 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.

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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 DTDP are for DIDP, which is an analog to DTDP. Results of studies with DIDP show that DTDP will not cause toxicity to terrestrial 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 plant toxicity dataset includes results for five species, Triticum aestivum, Brassica alba, Lepidum sativum, Lolium species and Lactuca sativa.