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Dissipation of trinexapac-ethyl and its metabolite in wheat field ecosystems and microbial degradation in soil

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To investigate the dissipation rate of trinexapac-ethyl and trinexapac in wheat ecosystem, field and microbial degradation experiments were designed and conducted. A simple and time-efficient analytical method for the determination of trinexapac-ethyl and trinexapac in wheat kernels, plants, straw and soil, using high-performance liquid chromatography–tandem mass spectroscopy (HPLC–MS/MS) was developed. The mean recoveries of trinexapac-ethyl and trinexapac in four matrices at three spiking levels ranged from 72.0% to 108.2%, and the relative standard deviation (RSD) ranged from 2.1% to 11.0%. In supervised field trials, the half-lives of trinexapac-ethyl in the plants were 0.93 and 2.36 d in Shandong and Tianjin, respectively; and those of trinexapac in soil and plants were 1.66 and 1.45 d in Shandong and 2.32 and 1.74 d in Tianjin. In microbial degradation experiment, the results show that the soil microbial communities have effects on their dissipation in the time scale employed.
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Keywords: HPLC–MS/MS; dissipation; microbial degradation; trinexapac; trinexapac-ethyl; wheat

Document Type: Research Article

Affiliations: Department of Chemistry, College of Science, China Agricultural University, Beijing, 100193, P.R. China

Publication date: December 8, 2014

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