Vol. 11, Issue 12 (2022)

Author(s):
CG Sawant, Guru PN, SG Mundhe, CS Patil and Rahul Sadhukhan

Abstract:
Studies on method validation of ethion 50 EC on gas chromatography equipped with a flame photometric detector (FPD) and the dissipation behavior of ethion 50 EC insecticide in cabbage heads were undertaken. Residues were estimated by following the series of quality tests involving the quantitation of an analyte in a specific solvent and sample matrix using a specific laboratory procedure and measurement system. The limit of quantification was 0.05 µg ml^-1. R² values for linearity and matrix match were 0.99. Percent recoveries at the fortification levels of 0.05, 0.25, and 0.50 mg kg^-1 were between 70-120 percent depicting the validity of the methods used for the present studies. Dissipation studies were undertaken following two foliar applications of ethion 50 EC at recommended and double the recommended doses (500 and 1000 g a. i. /ha) at the 50 percent head formation stage. Residues of ethion dissipated with a half-life of 3.11 and 2.52 days at both the doses, respectively. The residues reached below the quantification limit (BQL) on the 7^th day at the recommended dose. Considering this, a seven-day pre-harvest interval (PHI) can be suggested for ethion 50 EC with a reduced risk of residues in cabbage.