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Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery

This study aimed to explore the residual dynamics and dietary risk of dimethoate and its metabolite omethoate in celery. Celery was sprayed with 40% dimethoate emulsifiable concentrate (EC) at either a low concentration of 600 g a.i./ha or a high concentration of 900 g a.i./ha. Plants in the seedlin...

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Autores principales: Guo, Chunjing, Li, Guang, Lin, Qiujun, Wu, Xianxin, Wang, Jianzhong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7934647/
https://www.ncbi.nlm.nih.gov/pubmed/33717673
http://dx.doi.org/10.7717/peerj.10789
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author Guo, Chunjing
Li, Guang
Lin, Qiujun
Wu, Xianxin
Wang, Jianzhong
author_facet Guo, Chunjing
Li, Guang
Lin, Qiujun
Wu, Xianxin
Wang, Jianzhong
author_sort Guo, Chunjing
collection PubMed
description This study aimed to explore the residual dynamics and dietary risk of dimethoate and its metabolite omethoate in celery. Celery was sprayed with 40% dimethoate emulsifiable concentrate (EC) at either a low concentration of 600 g a.i./ha or a high concentration of 900 g a.i./ha. Plants in the seedling, transplanting, or middle growth stages were sprayed once, and the samples were collected 90 days after transplantation. Plants in the harvesting stage were sprayed two or three times. The samples were collected on days 3, 5, 7, 10, 14 and 21 after the last pesticide application. The dimethoate and omethoate compounds were extracted from the celery samples using acetonitrile, and their concentrations were detected using ultra-performance liquid chromatography-tandem mass spectrometry. Also, the dietary risk assessments of dimethoate and omethoate were conducted in various populations and on different foods in China. The metabolism led to the formation of omethoate from dimethoate in the celery. The degradation dynamics of dimethoate and total residues in greenhouse celery followed the first-order kinetic equation. The half-lives of the compounds were 2.42 days and 2.92 days, respectively. The celery which received one application during the harvesting stage had a final residue of dimethoate after 14 days, which was lower than the maximum residue limit (MRL) 0.5 mg kg(−1) for Chinese celery. The final deposition of the metabolite omethoate after 28 days was less than the maximum residue limit of 0.02 mg kg(−1) for Chinese celery. Furthermore, the risk quotients of dimethoate in celery were less than 1; therefore, the level of chronic risk was acceptable after day 21. Only children aged 2–7 years had an HQ of dimethoate more than 1 (an unacceptable level of acute risk), while the acute dietary risks to other populations were within acceptable levels. It was recommended that any dimethoate applications to celery in greenhouses should happen before the celery reached the harvesting stage, with a safety interval of 28 days.
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spelling pubmed-79346472021-03-11 Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery Guo, Chunjing Li, Guang Lin, Qiujun Wu, Xianxin Wang, Jianzhong PeerJ Agricultural Science This study aimed to explore the residual dynamics and dietary risk of dimethoate and its metabolite omethoate in celery. Celery was sprayed with 40% dimethoate emulsifiable concentrate (EC) at either a low concentration of 600 g a.i./ha or a high concentration of 900 g a.i./ha. Plants in the seedling, transplanting, or middle growth stages were sprayed once, and the samples were collected 90 days after transplantation. Plants in the harvesting stage were sprayed two or three times. The samples were collected on days 3, 5, 7, 10, 14 and 21 after the last pesticide application. The dimethoate and omethoate compounds were extracted from the celery samples using acetonitrile, and their concentrations were detected using ultra-performance liquid chromatography-tandem mass spectrometry. Also, the dietary risk assessments of dimethoate and omethoate were conducted in various populations and on different foods in China. The metabolism led to the formation of omethoate from dimethoate in the celery. The degradation dynamics of dimethoate and total residues in greenhouse celery followed the first-order kinetic equation. The half-lives of the compounds were 2.42 days and 2.92 days, respectively. The celery which received one application during the harvesting stage had a final residue of dimethoate after 14 days, which was lower than the maximum residue limit (MRL) 0.5 mg kg(−1) for Chinese celery. The final deposition of the metabolite omethoate after 28 days was less than the maximum residue limit of 0.02 mg kg(−1) for Chinese celery. Furthermore, the risk quotients of dimethoate in celery were less than 1; therefore, the level of chronic risk was acceptable after day 21. Only children aged 2–7 years had an HQ of dimethoate more than 1 (an unacceptable level of acute risk), while the acute dietary risks to other populations were within acceptable levels. It was recommended that any dimethoate applications to celery in greenhouses should happen before the celery reached the harvesting stage, with a safety interval of 28 days. PeerJ Inc. 2021-03-02 /pmc/articles/PMC7934647/ /pubmed/33717673 http://dx.doi.org/10.7717/peerj.10789 Text en © 2021 Guo et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Agricultural Science
Guo, Chunjing
Li, Guang
Lin, Qiujun
Wu, Xianxin
Wang, Jianzhong
Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery
title Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery
title_full Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery
title_fullStr Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery
title_full_unstemmed Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery
title_short Residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery
title_sort residual dynamics and dietary exposure risk of dimethoate and its metabolite in greenhouse celery
topic Agricultural Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7934647/
https://www.ncbi.nlm.nih.gov/pubmed/33717673
http://dx.doi.org/10.7717/peerj.10789
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