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

journal contribution
posted on 2023-05-20, 15:42 authored by Akbari, E, Alireza GhiasvandAlireza Ghiasvand, Dalvand, K
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.

History

Publication title

Microchemical Journal

Volume

158

Article number

105201

Number

105201

Pagination

1-8

ISSN

0026-265X

Department/School

School of Natural Sciences

Publisher

Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

Rights statement

© 2020 Elsevier B.V. All rights reserved.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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