Dissipation pattern and effect of household processing on reduction of Indoxacarb residues in tomato fruits (Lycopersicon esculentum Mill.)

Abstract

In the present research dissipation behaviour of indoxacarb 4.5% SC was investigated in tomato fruits sprayed at two doses i.e. 37.13 and 74.26 g a.i. ha-1. Tomato fruit samples were collected periodically on 0 (1h after application), 1, 3, 5, 7, 10, and 15 days after application. Tomato samples were fortified at 0.01 to 0.25 mg kg-1 levels and recovered 84.50 to 90.58 percent average residues. The initial deposits were found to be 0.63 and 0.82 mg kg-1 at single and double doses, respectively. Dissipation of indoxacarb fitted well to first order kinetics with half-life values ranging from 2.37 to 2.48 days at respective doses. Residues decreased substantially during household processing among which peeling was found most effective which resulted 87-89% reduction. LOD and LOQ were calculated to be 0.005 and 0.01 mg kg-1.