Dissipation of the pesticides fipronil, cypermethrin, and tebuconazole in vegetables: A case study in Thua Thien-Hue province, Central Vietnam

Abstract

This study was designed to understand the dissipation of fipronil, cypermethrin, and tebuconazole in green onions and mustard greens grown in Central Vietnam. A field trial on ca. 400 m 2 was implemented for two months with three different cropping regimes (natural plot-fully exposed to natural conditions; bed plot-fenced in by plastic sheets with an open roof; and protected plot-fully covered by plastic sheets) for each vegetable. A first-order kinetic model was successfully employed to interpret the dissipation data of each studied pesticide. A comparing the dissipation rate constants obtained under the same crop and growing regime between chemicals suggested that, among the chemicals examined, fipronil dissipated most readily. The pesticides were also proven to be more persistent in crops grown in protected plots than those grown in natural plots. The half-lives for fipronil, cypermethrin, and tebuconazole fluctuated, occurring at 0.4-2.2 days, 2.0-6.0 days, and 0.9-3.3 days, respectively.

Dissipation of Penconazole Formulation in Horticultural Crops by Ultrahigh Performance Liquid Chromatography-High Resolution Mass Spectrometry from the Active Substance to Metabolites

“…Pesticide dissipation in plants may involve physicochemical (volatilization, hydrolysis, photolysis, oxidation, reduction, etc. ) and/or biochemical processes (Chau, Son, & Van Hop, 2020). Additionally, several factors can influence pesticide dissipation, including climatic conditions (temperature, sunlight, humidity, etc.…”

“…Additionally, several factors can influence pesticide dissipation, including climatic conditions (temperature, sunlight, humidity, etc. ), pesticide properties, application method, time of harvest, dosage, plant species, time between applications, and food storage and preparation (Chau et al, 2020;Hassan, Ahmed, & Arief, 2013;Heshmati et al, 2019Heshmati et al, , 2020A. Rahimi, Heshmati, & Nili-Ahmadabadi, 2022;Romeh, Mekky, Ramadan, & Hendawi, 2009;Saadaoui, Boujelbane, Serairi, Ncir, & Mzoughi, 2021).…”