Abstract
An evaluation of residue levels of trifloxystrobin and tebuconazole was carried out on mango fruits after treatments with the combined formulation, trifloxystrobin (25 % w/w) and tebuconazole (50 % w/w), at standard and double doses of 250 + 500 and 500 + 1000 g a.i. ha−1, respectively. Extraction and purification of the mango fruit samples were carried out by the QuEChERS method after validating the analytical parameters. Determination of the fungicides was carried out by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The limits of detection (LOD) and limits of quantification (LOQ) for both fungicides were 0.015 μg mL−1 and 0.05 mg kg−1, respectively. The residue levels of trifloxystrobin for standard and double-dose treatments were 0.492 and 0.901 mg kg−1 and for tebuconazole were 0.535 and 1.124 mg kg−1, respectively. A faster dissipation of tebuconazole in mango fruit was observed compared with that for tebuconazole. Dissipation of trifloxystrobin and tebuconazole in mango followed first-order kinetics, and the half-lives were 9 and 6 days, respectively. The preharvest intervals (PHI), the time taken for the combined residues of trifloxystrobin and tebuconazole to dissipate to their permissible levels (maximum residue limits), were 14 and 20 days for standard and double doses, respectively. At harvest, mature mango fruit and soil were free from fungicide residues.
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The author thanks the Director, IIHR, Bangalore and Indian Council of Agricultural Research (ICAR), New Delhi, for sponsoring the study.
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Mohapatra, S. Residue levels and dissipation behaviors for trifloxystrobin and tebuconazole in mango fruit and soil. Environ Monit Assess 187, 95 (2015). https://doi.org/10.1007/s10661-015-4324-x
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DOI: https://doi.org/10.1007/s10661-015-4324-x