Open AccessElectrochemical Detection of As(III) by a rGO/Fe3O4-modified Screen-Printed Carbon Electrode
Author(s) -
Zhiyong Xie,
Jian Xu,
Fazhi Xie,
Shiquan Xiong
Publication year - 2016
Publication title -
analytical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 73
eISSN - 1348-2246
pISSN - 0910-6340
DOI - 10.2116/analsci.32.1053
Subject(s) - graphene , electrode , chemistry , detection limit , raman spectroscopy , electrochemistry , scanning electron microscope , cyclic voltammetry , analytical chemistry (journal) , calibration curve , electrolyte , dielectric spectroscopy , oxide , supporting electrolyte , nanotechnology , materials science , composite material , chromatography , organic chemistry , physics , optics
A reduced graphene oxide (rGO)/Fe 3 O 4 composites modified screen-printed carbon electrode (SPCE) was used to determinate As(III) in a HAc-NaAc buffer solution. The rGO/Fe 3 O 4 composites were prepared by a simple and one-pot synthesis method, and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), FT-IR and Raman spectra. The electrochemical behaviors of the composite electrode were characterized by cycle voltammetry and electrochemical impedance spectroscopy. The experimental parameters, such as supporting electrolyte, solution pH, deposition potential, deposition time were optimized, respectively. The calibration curve for the detection of As(III) in the range of 2 to 20 ppb was I = -4.495 + 1.922C, with a coefficient of 0.994. The sensitivity was 1.922 μA/ppb, and with about twice Fe 3 O 4 modified SPCE, a detection limit as low as 0.3 ppb was achieved. The proposed electrode was validated by analyzing the As(III) content in real water samples.