Magnetic solid‐phase extraction method for extraction of some pesticides in vegetable and fruit juices

Abstract

A new version of magnetic solid-phase extraction performed in a narrow-bore tube has been proposed for the extraction and preconcentration of different pesticides from various vegetable and fruit juices followed by gas chromatography. A few milligrams of C 8 @SiO 2 @Fe 3 O 4 nanoparticles are added into an aqueous sample solution placed in a narrow-bore tube. The sorbent particles move down through the tube under gravity and are collected at the end of the tube by applying an external magnetic field. The end of the tube is narrower and it is connected to a stopcock. After a predetermined time, the stopcock is opened and the solution is passed through the bed of the sorbent maintained by the magnet. Then the adsorbed analytes are desorbed using an elution solvent. To achieve high enrichment factors, a dispersive liquid-liquid microextraction method is carried out. The nanoparticles were characterized by scanning electron microscopy, X-ray diffraction, and FTIR spectroscopy. Under the optimum extraction conditions, limits of detection and quantification were in the ranges of 0.1-0.3 and 0.3-0.9 μg/L, respectively. High enrichment factors (1166-1605) and good extraction recoveries (58-80%) were obtained.

Extraction and Identification Techniques for Quantification of Carbamate Pesticides in Fruits and Vegetables

“…Furthermore, according to Neufeld et al [67], QuEChERS extraction has a high sensitivity to organophosphates and carbamates. Besides, the QuEChERS technique combined with magnetic SPE and DLLME was developed to remove pesticides from high-solid vegetable, fruit, and nectar samples [68].…”

Green magnetic snail shell hydroxyapatite sorbent for reliable solid‐phase extraction of pesticides from water samples

“…MSPE overcomes the limitations of traditional SPE methods, such as back pressure in cartridges and time-consuming processes that slow down the analysis. The use of magnetic adsorbents enables immediate separation of extracts and adsorbents without the need for centrifugation or filtration [10][11][12][13]. The choice of a suitable sorbent is crucial in the MSPE method [14,15].…”

Determination of eight endocrine disruptor pesticides in bovine milk at trace levels by dispersive liquid‐liquid microextraction followed by GC‐MS determination

“…These pesticides usually occur at low concentrations in the environment and are determined by GC [15–17], HPLC [18, 19] and, chromatography‐MS [20 ‐ 29].…”