Reduction of organophosphate insecticide residues in agricultural product using hydrophobic deep eutectic solvents based DL-Menthol

Abstract

Agricultural products, such as tomatoe, still contain insecticide residues that are harmful to humans as well as the environment. The commonly used insecticide is the organophosphate, where the residue are poisonous to the plant environment even to humans. Hydrophobic Deep Eutectic Solvent (DES) is a new generation of nonpolar solvent from ionic solvents because it has better physical properties and solvent properties for the extraction process. In this study, DES was synthesized at 50 °C for 15 minutes with a stirring speed of 300 rpm and a molar ratio of Dl-mentol: lauric acid varied from 1: 1, 2: 1, and 3: 1. Tomatoe from agricultural product, washed with DES mixed with 200 ml aquadest and washed with running water. DES characteristics are analyzing the shape and measuring freezing point, density and viscosity. The concentration of pesticide residues was analyzed using Gas Chromatography-Mass Spectrometer (GC-MS). Dimethoate insecticide removal is better using hydrophobic DES with a molar ratio of 3: 1, while the insecticide residue can be accessed reaching 46.25%. And for the Chlorpyrifos and Profenophos insecticide is better to use water, while the Chlorpyrifos and Profenophos insecticide residues can be reduced to reach 25.87% and 75.40%.