Amine-functionalized organically modified silica for the effective adsorption of Chlorpyrifos and Triazophos Residues from Orange juice.

Abstract

Excessive application of pesticides to combat pests in orange fruit has resulted in pervasive buildup of their residues leading to severe risks to human health. The study reports the synthesis of amine-functionalized-organically-modified silica (ormosil) to efficiently extract two target pesticides; chlorpyrifos (CPF) and triazophos (TAP) from orange juice. Synthesized ormosil was characterized using different analytical techniques such as scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and fourier transform infrared spectroscopy (FTIR). Adsorption kinetics of ormosil for CPF and TAP followed a pseudo-first-order indicating a physisorption process with excellent removal efficiencies. Detection limits for CPF and TAP were 0.075 and 0.048 μg L^-1, respectively. Similarly, limits of quantification were 0.8 and 0.6 μg L^-1. Furthermore, there was no significant decrease in the performance of ormosil against CPF and TAP over six successive adsorptive cycles. These findings underscore the potential of investigated ormosil in food analysis.