Electrochemically prepared three-dimensional reduced graphene oxide-polyaniline nanocomposite as a solid-phase microextraction coating for ethion determination

Maryam Heydari; Mohammad Saraji; Mohammad Taghi Jafari

doi:10.1016/j.talanta.2019.120576

Electrochemically prepared three-dimensional reduced graphene oxide-polyaniline nanocomposite as a solid-phase microextraction coating for ethion determination

Talanta. 2020 Mar 1:209:120576. doi: 10.1016/j.talanta.2019.120576. Epub 2019 Nov 21.

Authors

Maryam Heydari¹, Mohammad Saraji², Mohammad Taghi Jafari¹

Affiliations

¹ Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
² Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran. Electronic address: saraji@cc.iut.ac.ir.

PMID: 31892007
DOI: 10.1016/j.talanta.2019.120576

Abstract

Here, a three-dimensional reduced graphene oxide-polyaniline nanocomposite was synthesized and applied as a sorbent for solid-phase microextraction of ethion from water samples followed by negative corona discharge ionization ion mobility spectrometry. The nanocomposite was synthesized via a fast and facile two-step electrochemical method. The prepared sorbent was characterized by Fourier transform infrared spectroscopy, field emission scanning electron microscopy and thermogravimetric analysis. The main experimental parameters in the preparation of the fiber including concentration of graphene oxide, electrodeposition time, aniline concentration, and electropolymerization time were investigated. Also, parameters affecting the extraction process (i.e., salt addition, sample stirring rate, solution pH, extraction temperature and extraction time) were studied. Under the optimal conditions, the linearity and limit of detection were found to be 1.0-70 and 0.4 μg L^-1, respectively. The method presented good precision (intra-day and inter-day, n = 3), ranged from 1.7 to 4.7%. The analyte recovery obtained using spiked real water samples were in the range of 84-98%.

Keywords: Ethion; Negative corona discharge-ion mobility spectrometry; Polyaniline; Solid-phase microextraction; Three-dimensional reduced graphene oxide.