US EPA-Pesticides; Topramezone · 2015-09-16 · Levels of Concern were exceeded for vascular...
Transcript of US EPA-Pesticides; Topramezone · 2015-09-16 · Levels of Concern were exceeded for vascular...
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b. Aquatic
The primary route of exposure for aquatic plants is runoff. Drift was shown not to be a significant exposure route. Levels of Concern were exceeded for vascular endangered plants, with RQ ranging from 1.15 to 1.94, depending on the location of the corn scenario used in estimating environmental concentrations in surface water. Levels of Concei-n were not exceeded (RQ < 1) for non-endangered non-vascular plants and for endangered non~vascular plants.
Animals
No Levels of Concern were exceeded for acute and chronic risks associated with avian, mammal, fish, and invertebrate exposures to topramezone. Thus, minimal risk on an acute exposure basis is expected for birds, mammals, fish and invertebrates including reptiles and amphibians. However, some effects were observed in laboratory studies that suggest podential chronic effects.
Endocrine Disruptor Potential
The EFED is recommending this chemical for hture screening in the Endocrine Disruptor Screening Program (EDSP) in order to better characterize any topramezone effects related to endocrine disruption in wildlife and aquatic animals. 1
Topramezone showed some effects in laboratory studies, such as reduction in number hatched to viable embryos, hatchling body weight and female weight gain in birds, thdoid effects for mammal (thyroid tumors), reductions in weight and length of fish, and reduktions of live offspring produced per female daphnid. In addition, topramezone showed eye effects, pancreatic effects, and skeletal variations typically caused by inhibition of the 4-HPPQ enzyme.
c. Exposure Conclusions
Drift andlor runoff were identified as the routes leading to residues of toprarnezone in aquatic ecosystems. Drift and/or runoff, as well as post-treatment residues in soils, can be associated as potential exposure routes for non-target terrestrial plants. Inadvertent residues of topramezone can also be present in irrigation water and may be phytotoxic to irrigated non-target plants. In addition, soils containing residues of topramezone have the potential to be transported off-site by airborne dust or soil erosion. Recommended rotational crop intervals greater than 18 months suggest that residues of topramezone in soil are still active and &ay cause injury to sensitive, non-target plants.
Environmental Fate
Topramezone can be persistent in aerobic soils (half-life >I25 days). Although formation of metabolites involve microorganisms, dissipation of topramezone in the enviFnment appears to be predominantly controlled by time-dependent sorption. Even though the batch-equilibrium
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