Abstract
Dimethachlon, a dicarboximide fungicide, has gained widespread usage in Asian countries. While considered a low-toxicity fungicide, concerns regarding potential health effects, such as nephrotoxicity, have emerged. To date, neither China nor other countries have established maximum residue limit (MRL) for dimethachlon on grapes, and exposure risk assessment of dimethachlon is lacking. Here, we developed a QuEChERS method coupled with gas chromatography-mass spectrometry (GC–MS) to investigate the dissipation rates and terminal residues of dimethachlon in grapes, along with an assessment of dietary risk to consumers. Our results indicated that the average recoveries of dimethachlon in grapes ranged from 74 to 76%. The limit of quantification (LOQ) was 0.050 mg/kg. After undergoing 112 days of storage at −18 °C, the dissipation rate of dimethachlon in grapes was found to be less than 30%, suggesting a state of stable storage. In the context of good agricultural practice (GAP) guidelines, the half-lives of dimethachlon in grapes were 14.3–18.1 days, which is notably longer compared to the reported values for other crops. The terminal residues of dimethachlon in grapes at 14 and 21 days were found to be < 0.05–0.53 mg/kg and < 0.05–0.29 mg/kg, respectively. Regarding the dietary risk assessment, the calculated risk quotient (RQ) value was significantly below 100%, indicating a negligible chronic risk of dimethachlon in grapes at the recommended dosage. This study provides an important reference for the analysis of dimethachlon and offers valuable empirical data to support the establishment of MRL.
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The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors acknowledge support from China Agricultural University and Jiangxi Heyi Chemicals Co., Ltd.
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This study was funded by China Agricultural University and Jiangxi Heyi Chemicals Co., Ltd.
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All authors contributed to the study conception and design. Rumin Gao: Conceptualization, Investigation, Writing. Jianli Wang: Conceptualization. Jianhui Zhu: Investigation. Jiawen Ji: Investigation. Desheng Liu: Formal analysis. Zepu Gao: Investigation. Wenjun Liao: Formal analysis. Mengyao Wang: Investigation. Yongqiang Ma: Conceptualization, Methodology.
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Gao, R., Wang, J., Zhu, J. et al. Dissipation, residue, and dietary risk assessment of dimethachlon in grapes. Environ Sci Pollut Res 30, 91199–91206 (2023). https://doi.org/10.1007/s11356-023-28379-y
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DOI: https://doi.org/10.1007/s11356-023-28379-y