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Magnetic solid‐phase extraction method for extraction of some pesticides in vegetable and fruit juices
Author(s) -
Farajzadeh Mir Ali,
Safi Razieh,
Yadeghari Adeleh
Publication year - 2020
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201900790
Subject(s) - extraction (chemistry) , sorbent , chromatography , elution , solid phase extraction , chemistry , gas chromatography , adsorption , aqueous solution , magnetic nanoparticles , detection limit , sample preparation , solvent , tube (container) , solid phase microextraction , analytical chemistry (journal) , materials science , mass spectrometry , nanoparticle , gas chromatography–mass spectrometry , nanotechnology , organic chemistry , composite material
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.