Voltammetric and impedimetric determinations of selenium(iv) by an innovative gold-free poly(1-aminoanthraquinone)/multiwall carbon nanotube-modified carbon paste electrode

被引:14
作者
Ali, Asmaa Galal [1 ]
Altahan, Mahmoud Fatehy [2 ,4 ]
Beltagi, Amr Mohamed [3 ]
Hathoot, Abla Ahmed [1 ]
Abdel-Azzem, Magdi [1 ]
机构
[1] Menoufia Univ, Fac Sci, Chem Dept, Electrochem Lab, Shibin Al Kawm 32511, Egypt
[2] Natl Water Res Ctr, Cent Lab Environm Qual Monitoring, El Qanater El Khairia 13621, Egypt
[3] Kafrelsheikh Univ, Fac Sci, Chem Dept, Kafr Al Sheikh 33516, Egypt
[4] Helmholtz Ctr Ocean Res, GEOMAR, D-24148 Kiel, Germany
关键词
ANODIC-STRIPPING VOLTAMMETRY; INORGANIC SELENIUM; WATER SAMPLES; SPECIATION; CADMIUM; SENSOR; PRECONCENTRATION; CHROMATOGRAPHY; DISC;
D O I
10.1039/d1ra07588h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Selenite (Se4+), a significant source of water pollution above the permissible limits, is considered a valuable metal by environmentalists. In this study, we described a novel electrochemical sensor that utilized a carbon paste electrode (CPE) that was modified using multiwall carbon nanotubes (MWCNTs) and poly(1-aminoanthraquinone) (p-AAQ) for finding Se4+ in water samples. Electrochemical quantification of Se4+ depends on the formation of a selective complex (piaselenol) with p-AAQ. In this work, we prepared a CPE modified by physical embedding of MWCNTs and 1-aminoanthraquione (AAQ), while the polymer film was formed by anodic polymerization of AAQ by applying a constant potential of 0.75 V in 0.1 M HCl for 20 s followed by cyclic voltammetry (CV) from -0.2 to 1.4 V for 20 cycles. The modified CPE was used for differential pulse voltammetry (DPV) of Se4+ in 0.1 M H2SO4 from 0 to 0.4 V with a characteristic peak at 0.27 V. Further, the proposed sensor was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electrochemical impedance spectroscopy (EIS). The analytical conditions regarding the electrode performance and voltammetric measurements were optimized, with the accumulation time and potential, supporting electrolyte, differential-pulse period/time, and amplitude. The EIS results indicated that the p-AAQ/MWCNTs-modified CPE sensor (p-AAQ/MWCNTs/CPE) that also exhibited low charge-transfer resistance (R-ct) toward the anodic stripping of Se4+, exhibited good analytical performance toward different concentrations of Se4+ in a linear range of 5-50 mu g L-1 Se4+ with a limit of determination (LOD) of 1.5 mu g L-1 (3 sigma). Furthermore, differential-pulse voltammetry was employed to determine different concentrations of Se4+ in a linear range of 1-50 mu g L-1 Se4+, and an LOD value of 0.289 mu g L-1 was obtained. The proposed sensor demonstrated good precision (relative standard deviation = 4.02%) at a Se4+ concentration of 5 mu g L-1. Moreover, the proposed sensor was applied to analyze Se4+ in wastewater samples that were spiked with Se, and it achieved good recovery values.
引用
收藏
页码:4988 / 5000
页数:13
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