Dissipation behavior, residue distribution and dietary risk assessment of cyromazine, acetamiprid and their mixture in cowpea and cowpea field soil

Abstract

BACKGROUNDCyromazine and acetamiprid are widely applied as pesticides in agriculture, causing increasing concerns about their residues in crops. In this study, cyromazine, acetamiprid and their mixture were applied to cowpea to investigate their degradation dynamics and perform a dietary risk assessment.RESULTSThe dissipation behavior of cyromazine and acetamiprid in the single‐ and mixed‐pesticide groups followed first‐order kinetics, with a linear correlation coefficient of 0.910 to 0.987. The half‐lives of cyromazine and acetamiprid were 1.56–11.18 days in the four different matrices. The half‐life of cyromazine in the mixed‐pesticide group was similar to or even shorter than that in the single‐pesticide group. The highest levels of cyromazine and acetamiprid in cowpea occurred with a preharvest interval of 7 days and after two or three applications. These levels are below the maximum residue limits recommended by the Chinese Ministry of Agriculture for cyromazine and acetamiprid in cowpea. The risk quotient of cyromazine and acetamiprid ranged from 0.0018 to 0.0418, and the national estimated short‐term intake values of the cyromazine and acetamiprid were far below the acute reference dose as recommended by the European Food Safety Authority.CONCLUSIONThese results suggest that the use of cyromazine and acetamiprid and a cyromazine–acetamiprid mixture in cowpea is safe under the Good Agricultural Practices for Chinese fields, and the use of a cyromazine–acetamiprid mixture affords even better results than the application of cyromazine alone. Moreover, the residue dynamics information will support the label claims for the application of cyromazine, acetamiprid and a cyromazine–acetamiprid mixture to cowpea fruit. © 2020 Society of Chemical Industry

A Liquid Chromatographic Method for Determination of Acetamiprid and Buprofezin Residues and Their Dissipation Kinetics in Paddy Matrices and Soil

“…Previous experiments reported half-lives of acetamiprid in the range of 1-2 days for plant matrices like rice (Saha et al 2017), okra (Singh and Kulshrestha 2005), mustard (Pramanik et al 2006) and tea (Gupta and Shanker 2008); however, comparatively higher half-lives (2-5 days) were reported in some literature for watermelon , cowpea (Fu et al 2020) and chilli ). For soil matrices, half-lives ranging from 5-10 days were generally found (Yu et al 2011) and in some cases, half-lives of more than 10 days were also observed (Fu et al 2020;). For buprofezin, the studies on plants and soil were limited and its persistence behaviour was found varying with various crops (Mohapatra et al 2020).…”

Determination, dissipation dynamics, terminal residues and dietary risk assessment of thiophanate‐methyl and its metabolite carbendazim in cowpeas collected from different locations in China under field conditions

“…The acute and chronic dietary risks posed by thiophanate-methyl and carbendazim were determined from the following equations: 35,40 NESTI=FI×HR=b:w:…”

Residues, degradation behavior of cyproconazole in Sichuan pepper and its dietary risk assessment

“…Sufficient studies had demonstrated that acetonitrile had an appropriate polarity for most analytes, thereby generated higher recoveries and more minor co-extracted matrix components, such as pigments, proteins, lipids, and waxes (Xu et al, 2021;Fang et al, 2020;Fu et al, 2020). Consequently, acetonitrile was selected as the extraction solvent in this study.…”

“…QuEChERS, a quick, easy, cheap, effective, rugged, and safe pre-treatment technology, greatly simplified the sample pre-treatment process and became the preferred approach for pesticide multi-residue detection (Anastassiades et al, 2003). Therefore, it had been widely applied to analyze the pesticides on several substrates such as grains, oilseeds, tea, vegetables, and fruits (Huang et al, 2018;Fang et al, 2020;Fu et al, 2020). Moreover, Sufficient researches had been established the determination method coupled with QuEChERS for some pesticides in Sichuan pepper samples, including the high-performance liquid chromatography-mass spectrometry (HPLC-MS) method for the detection of flumetsulam (Wang et al, 2017), gas chromatography (GC) to detect pesticides such as BHC, DDT, fenvalerate, deltamethrin, fenthion, and malathion (Peng and Yao, 2019).…”