John Wiley & Sons, Ltd.

Dissipation and residues of trifloxystrobin and its metabolite in rice under field conditions

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Residue analysis of trifloxystrobin and its metabolite (CGA 321113) in rice matrices, paddy water, and soil was developed using the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method and high performance liquid chromatography tandem mass spectrometry (HPLC‐MS/MS). The method was used to evaluate the dissipation rate of trifloxystrobin and CGA 321113 in rice seedling, soil, and paddy water, as well as the residual level in harvest rice (grain, hull, straw) and soil. The results demonstrated that the dissipation half‐ lives of trifloxystrobin in rice seedling, soil, and water were 1.9–4.7, 0.35–0.54, and 0.28–0.51 d, respectively. The final total residue of trifloxystrobin and CGA 321113 was the highest in rice hull and lowest in paddy soil. The highest total residues in husked rice, rice hull, straw, and paddy soil at 28 d after spraying were 0.39, 3.82, 0.29, and 0.15 mg kg‐ 1, respectively. According to the final residue data and the maximum residue limits (MRLs) of trifloxystrobin in rice grain and straw (CODEX) and in rice hull (USA), 28 d could be recommended as the pre‐harvest interval (PHI) for trifloxystrobin application in the rice field. The data show that CGA 321113 constitutes a small amount of the final total residues in rice matrices, while are much higher than its parent compound in soil samples. Environ Toxicol Chem © 2014 SETAC

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