Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Persistence Study of Thiamethoxam and Its Metabolite in Kiwifruit for Establishment of Import Tolerance

  • Il Kyu Cho (Hyunnong Co. Ltd) ;
  • Gyeong Hwan Lee (Hyunnong Co. Ltd) ;
  • Woo Young Cho (Hyunnong Co. Ltd) ;
  • Yun-Su Jeong (Eco-Friendly Agri-Bio Research Center, Jeonnam Bioindustry Foundation) ;
  • Danbi Kim (Department of Agro-Food Safety and Crop Protection, National Institute of Agricultural Sciences) ;
  • Kil Yong Kim (Department of Agriculture and Biological Chemistry, Chonnam National University) ;
  • Gi-Woo Hyoung (Dong Yang Chemical Co., Ltd, D.Y. Environment-Technology. R/Institute) ;
  • Chul Hong Kim (Hyunnong Co. Ltd)
  • Received : 2022.12.17
  • Accepted : 2022.12.23
  • Published : 2022.12.31
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Abstract

BACKGROUND: Pre-harvest interval and decline pattern of thiamethoxam were determined in kiwifruit using liquid chromatography-tandem mass spectrometry (LCMS/MS). The study was carried out to propose import tolerance using OECD maximum residue limit (MRL) calculator for the export promotion of kiwifruit to Taiwan. METHODS AND RESULTS: The thiamethoxam residue in kiwifruit was determined by using the LC-TriQ-MS/MS with the analytical process to set up the import tolerance under greenhouse conditions for Taiwan. Excellent linearity was observed for all of the analytes with a determination coefficient (R2)≥0.99. The limit of quantification was determined to be 0.01 mg/kg for both thiamethoxam and clothianidin in kiwifruit. Linearity was determined from the co-efficient of determinants (R2) obtained from the seven-point calibration curve. The standard calibration curve showed as follows; 1) Site 1 (Gimje): y = 944,406X + 1,583 (R2=0.9995), 2) Site 2 (Goheung): y = 1,356,205X + 934 (R2=0.9983), and 3) Site 3 (Jangheung): y = 1,239,937X - 3,090 (R2=0.9908). The residue of thiamethoxam in the kiwifruit for three decline trials showed the range of 0.35 to 0.56 mg/kg in site 1 (Gimje), 0.24 to 0.55 mg/kg in site 2 (Goheung), and 0.28 to 0.42 mg/kg in site 3 (Jangheung), respectively. However, clothianidin was not detected in all of the treatments. The maximum residual amounts (decline) in the samples, sprayed according to the safe-use standard for thiamethoxam 10% WG in kiwifruit (30 days before harvest, 3 sprays every 7 days) were 0.56 mg/kg in site 1, 0.55 mg/kg in site 2, and 0.42 mg/kg in site 3, respectively. CONCLUSION(S): The import tolerance (IT) of thiamethoxam for kiwifruit may be proposed to be 0.9 mg/kg by using the OECD MRL calculator.

Keywords

Acknowledgement

This work was supported by the Research Program for Agricultural Science & Technology Development (Project No. PJ01364103), Republic of Korea in 2022.

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