Dissipation kinetics and safety evaluation of tebuconazole and trifloxystrobin in tea under tropical field conditions

ABSTRACT

Dissipation kinetics of tebuconazole, trifloxystrobin and its acid metabolite residues were studied in tea under tropical field conditions using GC-MS (SIM). The average recoveries ranged from 80.7% to 105.8%, with a RSD of <9.3%. Dissipation rate for both doses applied followed first-order kinetics, with half-lives in green leaves in the range of 2.8–3.3 and 2.9–3.3 days; ranges in processed tea were 2.7–3.6 days for trifloxystrobin and 3.0–3.1 days for tebuconazole. The trifloxystrobin residues were not transferred into the tea infusion during the infusion process; tebuconazole did transfer, in the range of 14.3–18.9%. As the theoretical maximum residue contributions on tea from initial deposits were found to be less than the maximum permissible intake values, at the recommended application dose a withdrawal period of 23 days before consumption should be applied to reduce risk.

Graphical Abstract

KEYWORDS:

• Tebuconazole
• trifloxystrobin
• tea
• GC-MS
• PHI
• safety evaluation

Acknowledgment

The authors are indebted to Department of Agricultural Entomology for providing infrastructural facilities, Tamil Nadu Agricultural University, Coimbatore, India for conduct the experiment and Bayer CropScience Ltd, India for providing the necessary financial support to accomplish this project.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplemental material

The supplemental material for this article can be accessed here.

Additional information

Funding

This work was supported by Bayer CropScience Ltd, India.