title: Fate of a novel strobilurin fungicide pyraoxystrobin in flooded soil.
abstract: Pyraoxystrobin, ((E)-2-(2-((3-(4-chlorophenyl)-1-methyl-1H-pyrazol-5-yloxy) methyl) phenyl)-3-methoxyacrylate) is a novel strobilurin fungicide with excellent and broad spectrum antifungal efficiency. Environmental behaviors of the new fungicide must be assessed to understand its potential risks to the environment. In this study, the extractable residues, bound residues and mineralization, as well as the dissipation rates of pyraoxystrobin were investigated in three flooded soils using a (14)C tracing technique. Results showed that pyraoxystrobin didn't undergo appreciable dissipation during the 100 day incubation period in some tested soils, with 70.01%, 28.58% and 83.85% of the parent compound remaining in the solonchak, cambisol and acrisol soils at the end of the experiment, respectively. Almost no (14)C-pyraoxystrobin was mineralized to (14)CO2 (<0.5%) over the experimental period. Organic matter had a dominating influence on the bound residues formation and the fractions of bound residues increased as the soil organic matter content increased. Less than 9% of the radioactivity was found in the aqueous phase, while the majority of extractable residues (>65.39%) were recovered in the organic extracts. This study aims to give a deep insight into the environmental behaviors of pyraoxystrobin and may be beneficial for the risk assessment of other analogous fungicides.
authors.affiliation: Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture, Zhejiang University, Kaixuan Road No. 268, Hangzhou 310029, Zhejiang, China. dingxch@zju.edu.cn.
authors.forename: Tilong
authors.initials: T
authors.lastname: Yang
authors.forename: Chao
authors.initials: C
authors.lastname: Xu
authors.forename: Xunyue
authors.initials: X
authors.lastname: Liu
authors.forename: Xia
authors.initials: X
authors.lastname: Chen
authors.forename: Jianbo
authors.initials: J
authors.lastname: Zhang
authors.forename: Xingcheng
authors.initials: X
authors.lastname: Ding
mesh_terms: D000179:Acrylates / Q000032:analysis*; D004784:Environmental Monitoring; D005659:Fungicides, Industrial / Q000032:analysis*; D008956:Models, Chemical; D010573:Pesticide Residues / Q000032:analysis; D011720:Pyrazoles / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: C000590225:2-(2-((3-(4-chlorophenyl)-1-methyl-1H-pyrazol-5-yloxy)methyl)phenyl)-3-methoxyacrylate; D000179:Acrylates; D005659:Fungicides, Industrial; D010573:Pesticide Residues; D011720:Pyrazoles; D012987:Soil; D012989:Soil Pollutants