The decline and residues of hexaconazole in tomato and soil |
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Authors: | Hongwu Liang Li Li Wei Li Yijun Wu Fengmao Liu |
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Institution: | (1) College of Science, China Agricultural University, 100193 Beijing, People’s Republic of China;(2) State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, People’s Republic of China;(3) Beijing Research Institute of Chemical Industry, SINOPEC, 100013 Beijing, People’s Republic of China;(4) Institute for the Control of Agrochemicals, Ministry of Agriculture, 100026 Beijing, People’s Republic of China; |
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Abstract: | The decline and terminal residues of hexaconazole in tomato and soil in open field were studied. Hexaconazole residues were
determined by gas chromatography coupled with an electron capture detector. Recoveries were between 89% and 110% with RSD
of 2.99–5.88% in tomato and 90–119% with RSD of 1.15–5.76% in soil at spiked levels of 0.01, 0.1, and 1 mg/kg, respectively.
The limit of detection of hexaconazole was 6.3 × 10−12 g. The decline rates of hexaconazole were described using first-order kinetics and the mean half-lives of hexaconazole in
tomato and soil were 4.3 and 18.1 days, respectively. The terminal residues in tomato at interval of 7 days at the dosage
of 150 g.a.i./hm2 for three or four times were all below 0.1 mg/kg. This work would be the guidance of establishing the maximum residue limit
of hexaconazole in tomato in China. |
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