Abstract
Isocycloseram is a new isoxazoline group pesticide with novel mode of action and very effective against various insect and mite species. The study was undertaken to determine the residual behavior of isocycloseram in/on tomato fruit and soil using liquid chromatography-tandem mass spectrometry. The limit of quantification and limit of detection were workout to be 0.01 and 0.003 μg/g, respectively for isocycloseram and the metabolites. The recovery of isocycloseram and metabolites were 94–105 % in tomato matrix and in soil matrix recovery was 93–101 % with < 20 % relative standard deviation. After applications of 60 and 75 g a.i./ha, the total initial residues of isocycloseram (including metabolites) on tomato fruits were 0.411 and 0.670 µg/g that dissipated to half in 3.13 and 3.46 days at respective doses. The hazard quotient computed for the insecticide was below one thus indicating its safety for humans.
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