The use of silica‐coated magnetic graphene microspheres as the adsorbent for the extraction of pyrethroid pesticides from orange and lettuce samples followed by GC–MS analysis

Abstract

Graphene-grafted ferroferric oxide microspheres were used as the adsorbent to extract some pyrethroid pesticides (bifenthrin, λ-cyhalothrin, cyfluthrin, cypermethrin, fenvalerate, and deltamethrin) from orange and lettuce samples prior to their determination by GC-MS. The main variables that could affect the extraction, including the amount of the adsorbent, pH of the sample solution, extraction time, concentration of salt, and desorption conditions, were investigated and optimized. Under the optimized conditions, a linear response was obtained in the concentration range of 0.3-100.0 ng/g for the analytes with the coefficients of determination ranging from 0.9877 to 0.9925. The LODs for the pyrethroids ranged from 0.01 to 0.02 ng/g. The method provided a good repeatability with RSDs < 10.6%. The recoveries for the six pyrethroid pesticides were in the range from 90.0 to 103.7%. The method was applied to the determination of the pesticides in orange and lettuce samples with a satisfactory result.

Covalent triazine‐based frameworks/iron oxide for highly sensitive magnetic solid‐phase extraction of phenolic pollutants in water samples

“…Compared with conventional SPE, MSPE can avoid clogging of the sorbent and high backpressure, which can affect the loading flow rate and extraction efficiency . MSPE has drawn great attention because of its obvious advantages, including simplicity, rapidness, low solvent consumption, reduced cost, labor, and recyclable reuse . Magnetic adsorbents are important in MSPE.…”

“…Compared with conventional SPE, MSPE can avoid clogging of the sorbent and high backpressure, which Article Related Abbreviations: ACN, acetonitrile; COF, Covalent organic framework; CTFs/Fe 2 O 3 , covalent triazine-based frameworks/iron oxide; DCB, 1,4-Dicyanobenzene; MSPE, magnetic solid-phase extraction can affect the loading flow rate and extraction efficiency [5]. MSPE has drawn great attention because of its obvious advantages, including simplicity, rapidness, low solvent consumption, reduced cost, labor, and recyclable reuse [6][7][8]. Magnetic adsorbents are important in MSPE.…”

Aminosilanized magnetic carbon microspheres for the magnetic solid‐phase extraction of bisphenol A, bisphenol AF, and tetrabromobisphenol A from environmental water samples

“…MSPE can avoid the time‐consuming column passing operation in comparison with the traditional SPE . Moreover, the dispersion extraction mode can increase the overall extraction efficiency , and most magnetic adsorbents can be recycled and reused . The advantages of the rapidity, simplicity, and reduced cost, labor, and time render MSPE a prospective method for sample preparation .…”

Magnetic graphene oxide modified by imidazole‐based ionic liquids for the magnetic‐based solid‐phase extraction of polysaccharides from brown alga

“…Obviously, MSPE can improve the extraction efficiency and simplify the process . Moreover, the efficient contact area between the sorbents and analytes increases largely due to the dispersive extraction mode, and the majority of magnetic sorbents can be recycled and reused easily . Therefore, MSPE has comprehensive advantages for simplifying the process and saving time and labor, which indicates its bright application prospect for sample preparation .…”