Dissipation kinetics and dietary risk assessment of pesticides in/on citrus (mandarin)

Abstract

AbstractA supervised field trial was conducted to evaluate the dissipation pattern and dietary risk assessment of the pesticides, Solomon (recommended dose, X (63+147 g a.i./ha) and double the recommended dose, 2X (126+294 g a.i./ha)); spirotetramat (X dose: 90 g a.i./ha and 2X dose: 180 g a.i./ha) and indaziflam (X dose: 62.5 g a.i./ha and 2X dose: 125 g a.i./ha) in citrus (mandarin) fruits and cropped soil. Solomon and spirotetramet were applied as foliar spray at the fruit development stage and indaziflam was applied directly on to the weeds. Fruit and soil samples thus collected were extracted using a quick, easy, cheap, effective, rugged, and safe analytical method for residue estimation, which was carried out using Gas Chromatography‐Electron Capture Detector for betacyfluthrin and High‐Performance Liquid Chromatography for all other analytes. Residues of betacyfluthrin reached below the determination level (0.05 mg/kg) after the 3rd and 5th day of treatment at X and 2X dosage while imidacloprid and spirotetramat residues reached below the determination level on the 5th and 7th day, respectively. Residues of indaziflam and its metabolites were not detected in any citrus and soil matrices. Dietary risk assessment calculated as hazard quotient and theoretical maximum dietary intake revealed the safety of the pesticides for human consumption after application of these pesticides on citrus.