Dissipation Kinetics of Hexaconazole and Lambda-Cyhalothrin Residue in Soil and Potato Plant
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The dissipation behaviour and left-over residues of Hexaconazole fungicide and Lambda-Cyhalothrin pesticide in potato plant and soil were analysed by gas chromatography mass spectrometry (GC-MS). At fortified levels of 10, 100 and 500 μg/kg, the recoveries of Lambda-Cyhalothrin and Hexaconazole were in the range 81.66–93.25% and 76.11–93.92% with standard deviations of 0.87–8.13% and 0.88–7.68%, respectively. The half-life ranges for all matrices (tuber, stem, leaf and soil) were 13.8–17.3 days for Hexaconazole and 11.5–17.3 days for Lambda-Cyhalothrin. The final concentration of Hexaconazole and Lambda-Cyhalothrin in tuber at harvest was compared with the maximum residual limit (MRL) of CODEX (0.01 mg/kg) and EU (0.02 mg/kg) and found to be higher at dosages of 30 g/ha and 40 g/ha, respectively. There was no residual concentration of either pesticide in the control plot. The results obtained from risk evaluation showed that the risk of Lambda-Cyhalothrin at dosage of 7–15 g/ha and Hexaconazole at dosage of 5–30 g/ha was negligible to humans while a dose of 40 g/ha for Lambda-Cyhalothrin resulted in a health hazard to humans. This study may prove helpful in ascertaining the MRL and also provide direction on the appropriate use of Lambda-Cyhalothrin and Hexaconazole in potato farming as the waiting period from last application to harvest is 25 days for Hexaconazole and 38 days for Lambda-Cyhalothrin.
KeywordsFungicide residues Gas chromatography mass spectrometry Heaxaconazole residues Lambda-Cyhalothrin residues Pesticide residues Potatoes
The authors are thankful to the director and Head of the Civil Engineering department Motilal Nehru National Institute of Technology Allahabad, India, for providing the necessary laboratory facilities for this research work.
Compliance with Ethical Standards
This study is part of Raginee Devi’s Ph. D program with support from MNNIT Allahabad, India.
Conflict of Interest
The authors declare that they have no conflict of interest.
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