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Nanostructured octadecylsilica chemically coated stainless-steel fiber for vacuum-assisted HS-SPME sampling of PAHs in soil

Akbari, E, Ghiasvand, A ORCID: 0000-0002-4570-7988 and Dalvand, K 2020 , 'Nanostructured octadecylsilica chemically coated stainless-steel fiber for vacuum-assisted HS-SPME sampling of PAHs in soil' , Microchemical Journal, vol. 158 , pp. 1-8 , doi: 10.1016/j.microc.2020.105201.

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An efficient and robust solid-phase microextraction (SPME) fiber was developed for vacuum-assisted sampling of polycyclic aromatic hydrocarbons (PAHs) in solid samples. The surface of a stainless-steel fiber was first oxidized and then coated with nanostructured n-octadecylsilica using the Stöber method, by hydrolysis and condensation of tetraethylorthosilicate in the presence of octadecyltrichlorosilane through a sol–gel strategy. The synthesized sorbent was characterized using scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX) and Fourier transform infrared spectroscopy (FT-IR). The developed vacuum-assisted headspace SPME (VA-HS-SPME) procedure was coupled with GC-FID and optimized for the analysis of PAHs in soil, using multivariate statistical analysis, based on Box-Behnken design. The calibration graphs for seven PAHs were linear (R2 > 0.995) over 0.001-4000 ng g-1. The limits of detection were found to be 0.1-0.9 pg g-1. The relative standard deviations for six repeated analyses of 100 ng g-1 of the PAHs (using a single fiber) were calculated 3.2-8.7% and fiber-to-fiber reproducibility (n = 6) obtained 5.2-12.34%. The nanostructured octadecylsilica was shown to be substantially robust and durable. It was utilized for ultrasensitive VA-HS-SPME/GC analysis of the PAHs in different polluted soil samples and satisfactory results were obtained, with low matrix effects.

Item Type: Article
Authors/Creators:Akbari, E and Ghiasvand, A and Dalvand, K
Keywords: nanostructured octadecylsilica, VA-HS-SPME, Sol-gel, stainless-steel, PAHs
Journal or Publication Title: Microchemical Journal
Publisher: Elsevier Science Bv
ISSN: 0026-265X
DOI / ID Number: 10.1016/j.microc.2020.105201
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© 2020 Elsevier B.V. All rights reserved.

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