Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.

Multiple insecticides’ residues after the mixed application of several neonicotinoids cause combined pollution and bring new challenges to food safety and pest control during agricultural production. In this study, three neonicotinoid insecticides, namely imidacloprid (IMI), acetamiprid (ACE), and t...

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Autores principales:	Yangyang Lu, Qinxiong Rao, Qicai Zhang, Xing Liu, Wei Song, Shuhui Guan, Shanshan Chen, Weiguo Song
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	neonicotinoids insecticide mixtures dynamic residues dissipation <i>Brassica chinensis</i> L. Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/b9fb85a546f2420fb729d8a1e8f51bc9
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spelling	oai:doaj.org-article:b9fb85a546f2420fb729d8a1e8f51bc92021-11-11T18:29:43ZStudy on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.10.3390/molecules262164951420-3049https://doaj.org/article/b9fb85a546f2420fb729d8a1e8f51bc92021-10-01T00:00:00Zhttps://www.mdpi.com/1420-3049/26/21/6495https://doaj.org/toc/1420-3049Multiple insecticides’ residues after the mixed application of several neonicotinoids cause combined pollution and bring new challenges to food safety and pest control during agricultural production. In this study, three neonicotinoid insecticides, namely imidacloprid (IMI), acetamiprid (ACE), and thiamethoxam (TMX), were mixed and evenly sprayed on <i>Brassica chinensis</i> L. in the field. Then, the insecticides’ residues were dynamically monitored to determine the differences in their rates of dissipation and final residues after 10 days. The results showed that the dissipation kinetics of neonicotinoids still conformed to the first-order kinetic model for binary or ternary application of neonicotinoid mixtures, with all determination coefficients (R<sup>2</sup>) being above 0.9 and the dissipation half-life (DT<sub>50</sub>) being 2.87–6.74 d. For treatment groups with five times the recommended dosages (IMI 300 g·hm<sup>−</sup><sup>2</sup>, ACE 900 g·hm<sup>−</sup><sup>2</sup>, and TMX 600 g·hm<sup>−</sup><sup>2</sup>), mixed insecticides had a slower dissipation rate, and the DT<sub>50</sub> values of mixtures were longer than those of single insecticides. Moreover, the final insecticide residues with mixed application were higher than those of single compounds at 10 d after spraying. Thus, mixed applications of neonicotinoids may increase food safety risks as they increase the final insecticide residues in <i>Brassica chinensis</i> L., and care should therefore be taken when considering the combined use of such compounds.Yangyang LuQinxiong RaoQicai ZhangXing LiuWei SongShuhui GuanShanshan ChenWeiguo SongMDPI AGarticleneonicotinoidsinsecticide mixturesdynamic residuesdissipation<i>Brassica chinensis</i> L.Organic chemistryQD241-441ENMolecules, Vol 26, Iss 6495, p 6495 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	neonicotinoids insecticide mixtures dynamic residues dissipation <i>Brassica chinensis</i> L. Organic chemistry QD241-441
spellingShingle	neonicotinoids insecticide mixtures dynamic residues dissipation <i>Brassica chinensis</i> L. Organic chemistry QD241-441 Yangyang Lu Qinxiong Rao Qicai Zhang Xing Liu Wei Song Shuhui Guan Shanshan Chen Weiguo Song Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.
description	Multiple insecticides’ residues after the mixed application of several neonicotinoids cause combined pollution and bring new challenges to food safety and pest control during agricultural production. In this study, three neonicotinoid insecticides, namely imidacloprid (IMI), acetamiprid (ACE), and thiamethoxam (TMX), were mixed and evenly sprayed on <i>Brassica chinensis</i> L. in the field. Then, the insecticides’ residues were dynamically monitored to determine the differences in their rates of dissipation and final residues after 10 days. The results showed that the dissipation kinetics of neonicotinoids still conformed to the first-order kinetic model for binary or ternary application of neonicotinoid mixtures, with all determination coefficients (R<sup>2</sup>) being above 0.9 and the dissipation half-life (DT<sub>50</sub>) being 2.87–6.74 d. For treatment groups with five times the recommended dosages (IMI 300 g·hm<sup>−</sup><sup>2</sup>, ACE 900 g·hm<sup>−</sup><sup>2</sup>, and TMX 600 g·hm<sup>−</sup><sup>2</sup>), mixed insecticides had a slower dissipation rate, and the DT<sub>50</sub> values of mixtures were longer than those of single insecticides. Moreover, the final insecticide residues with mixed application were higher than those of single compounds at 10 d after spraying. Thus, mixed applications of neonicotinoids may increase food safety risks as they increase the final insecticide residues in <i>Brassica chinensis</i> L., and care should therefore be taken when considering the combined use of such compounds.
format	article
author	Yangyang Lu Qinxiong Rao Qicai Zhang Xing Liu Wei Song Shuhui Guan Shanshan Chen Weiguo Song
author_facet	Yangyang Lu Qinxiong Rao Qicai Zhang Xing Liu Wei Song Shuhui Guan Shanshan Chen Weiguo Song
author_sort	Yangyang Lu
title	Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.
title_short	Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.
title_full	Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.
title_fullStr	Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.
title_full_unstemmed	Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.
title_sort	study on the dynamic difference between single and mixed residues of three neonicotinoids in <i>brassica chinensis</i> l.
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b9fb85a546f2420fb729d8a1e8f51bc9
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Study on the Dynamic Difference between Single and Mixed Residues of Three Neonicotinoids in <i>Brassica chinensis</i> L.

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