Abstract
The dissipation and terminal residues of a fungicide suspension (5 % hexaconazole, 25 % kresoxim-methyl) in ginseng and soil were investigated by high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS). At fortified levels of 0.01, 0.02, and 0.20 mg kg−1, the recoveries of hexaconazole and kresoxim-methyl were in the range of 80.6∼94.8 % and 82.4∼98.8 % with relative standard deviation of 3.42–9.12 % and 3.19–8.58 %, respectively. The half-lives were 7.09–10.73 days in root, 6.80–7.95 days in stem, 5.31–8.49 days in leaf, and 6.30–7.97 days in soil. The terminal residues were all below the maximum residue limits (MRLs) of EU and South Korea. Risk assessment results indicated that the risk of hexaconazole and kresoxim-methyl use in ginseng at dosage of 60–90 g a.i. ha−1 was negligible to humans. This work would help the government to establish the MRL and provide guidance on the proper and safe use of hexaconazole and kresoxim-methyl in ginseng.
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Acknowledgments
This work was supported by Agricultural Product Quality and Safety of World Bank Loan Project (No. 2011-Z24) and Special Fund for Ginseng Industrial Development of Jilin province in 2011.
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Yan Wang and Chunwei Wang contributed equally to this study.
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Wang, Y., Liu, C., Gao, J. et al. Dissipation behavior of hexaconazole and kresoxim-methyl residues in ginseng and soil under field conditions. Environ Monit Assess 187, 4126 (2015). https://doi.org/10.1007/s10661-014-4126-6
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DOI: https://doi.org/10.1007/s10661-014-4126-6