Simultaneous detection of fluquinconazole and flusilazole in lettuce using gas chromatography with a nitrogen phosphorus detector: decline patterns at two different locations |
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Authors: | So Jeong Im Md Musfiqur Rahman A. M. Abd El‐Aty Sung‐Woo Kim Humayun Kabir Waziha Farha Truong Lieu Young‐Jun Lee Da‐I. Jung Jeong‐Heui Choi Ho‐Chul Shin Geon‐Jae Im Su‐Myeong Hong Jae‐Han Shim |
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Affiliation: | 1. Biotechnology Research Institute, College of Agriculture and Life Sciences, Gwangju, Republic of Korea;2. Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Seoul, Republic of Korea;3. Department of Pharmacology, Faculty of Veterinary Medicine, Giza, Egypt;4. Department of Agro‐food Safety, National Academy of Agricultural Science, Rural Development Administration, Wanju, Republic of Korea |
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Abstract: | Method validations in addition to decline patterns of fluquinconazole and flusilazole in lettuce grown under greenhouse conditions at two different locations were investigated. Following the application of fluquinconazole and flusilazole at a dose rate of 20 mL/20 L water, lettuce samples were collected randomly for up to 7 days post‐application, and simultaneously extracted with acetone, purified through solid‐phase extraction, analyzed via gas chromatography with a nitrogen phosphorus detector, and confirmed through gas chromatography–mass spectrometry. The linearity was excellent, with determination coefficients (R2) between 0.9999 and 1.0. The method was validated in triplicate at two different spiking levels (0.2 and 1.0 mg/kg) with satisfactory recoveries between 75.7 and 97.9% and relative standard deviations of <9. The limit of quantification was 0.01 mg/kg. Both analytes declined very quickly, as can be seen from the short half‐life time of <4 days. Statistical analysis revealed significant differences between residues at different days of sampling, except at 7 days post‐application (triple application). At that point, the decline patterns of fluquinconazole and flusilazole were independent of application rate, location, temperature and humidity. Copyright © 2015 John Wiley & Sons, Ltd. |
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Keywords: | flusilazole fluquinconazole lettuce GC‐NPD residue decline pattern half‐life |
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