Electroless-coated magnetic three-dimensional graphene with silver nanoparticles used for the determination of pesticides in fruit samples.
Hassan SereshtiZahra AfsharsavehHamid GaikaniHamid Rashidi NodehPublished in: Journal of separation science (2018)
A new type of adsorbent composed of magnetic three-dimensional graphene coated with silver nanoparticles was synthesized by an electroless technique and used in the magnetic solid-phase extraction of selected pesticides (fenitrothion, chlorpyrifos, and hexaconazole) before gas chromatography with a micro-electron capture detector. The adsorbent was characterized using Fourier-transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometry, and field-emission scanning electron microscopy. The important extraction parameters such as pH, adsorbent dose, extraction time, and desorption conditions were investigated. Under the optimal conditions, the analytical figures of merit were obtained as: linear dynamic range of 0.1-5 ng/g with determination coefficients of 0.991-0.996; limit of detection of 0.07-0.13 ng/g; limit of quantification of 0.242-0.448 ng/g; and the intraday and interday relative standard deviations (C = 5 ng/g, n = 3) were 3.8-8.7 and 6.6-8.9%, respectively. The developed method was successfully applied for analysis of the selected pesticides in tomato and grape with extraction recoveries in the range of 72.8-109.6%.
Keyphrases
- solid phase extraction
- gas chromatography
- electron microscopy
- molecularly imprinted
- silver nanoparticles
- tandem mass spectrometry
- liquid chromatography
- high performance liquid chromatography
- liquid chromatography tandem mass spectrometry
- gas chromatography mass spectrometry
- high resolution mass spectrometry
- ultra high performance liquid chromatography
- simultaneous determination
- mass spectrometry
- high resolution
- atomic force microscopy
- room temperature
- magnetic resonance
- real time pcr
- computed tomography
- loop mediated isothermal amplification
- single molecule
- risk assessment
- quantum dots
- ionic liquid