Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1598, Issue -, Pages 20-29Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2019.03.048
Keywords
Fe3O4@SiO2@KIT-6; Pyrethroid pesticides; Magnetic solid phase extraction; High performance liquid chromatography; Adsorption kinetics; Adsorption isotherms
Funding
- National Natural Science Foundation of China [21177061]
- Natural Science Foundation of Jiangsu Province [BK20150968]
- Technology-Based Pioneering Enterprise Incubation Project of Jiangsu Province [BC2016003]
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Mesoporous KIT-6-magnetite composite (Fe3O4@SiO2@KIT-6) was successfully prepared and characterized by transmission electron microscopy, scan electron microscopy, elemental mapping, energy dispersive X-ray spectrum, Fourier transform infrared spectroscopy, thermal gravimetric analysis, X-ray powder diffraction, Brunauer Emmett Teller analysis and magnetic property analysis. It was then applied as adsorbent for magnetic solid phase extraction of fenpropathrin, lambda-cyhalothrin, S-fenvalerate and bifenthrin from water samples before analyzed by high performance liquid chromatography-ultraviolet detector. A few factors impacting extraction were studied. The optimal results were acquired by using acetonitrile to eluent the targets adsorbed on 40 mg of Fe3O4@SiO2@KIT-6 adsorbent in 100 mL water samples at a pH of 7 at 25 degrees within 10 min. The experimental limit of detections of fenpropathrin, cyhalothrin, S-fenvalerate and bifenthrin are 0.01 x 10(-3), 0.006 x 10(-3), 0.01 x 10(-3) and 0.005 x 10(-3) mg.L-1. respectively. Good relative recoveries (86.58-98.80%) and reproducibility values are also obtained. The kinetic experiment shows that the adsorption follows pseudo-second order, while the isotherm experiment follows Langmuir isotherm model. Trace pyrethroid pesticides in water samples can be detected by the developed magnetic solid phase extraction technique followed by high performance liquid chromatography, which is simple, easy, environmental friendly and efficient. (C) 2019 Elsevier B.V. All rights reserved.
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