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

Abstract

The selenite ion is quantified electrochemically by selective complexation with poly(1-aminoanthraquione) to give a piaselenol complex on a modified p-AAQ/MWCNTs/CPE sensor.

Highly sensitive electrochemical detection of myricetin in food samples based on the enhancement effect of Al-MOFs

“…In the equivalent circuit diagram given in the inset, R s is the solution resistance, Y 0 is the constant phase element, R ct is the charge transfer resistance and W 1 is the Warburg impedance. 39 The R ct values of the bare CPE and CAU-1/CPE were estimated to be 97.1 Ω and 11.8 Ω, respectively. Due to the high conductivity and microporous surface, the R ct value of CAU-1/CPE decreased, which accelerated the rate of electron transfer.…”

Recent advances in the modification of electrodes for trace metal analysis: a review

“…Nandy et al 97 synthesized a block copolymer from poly (methyl methacrylate) and poly(2-acrylamido-2-methylpropane sulfonic acid) and, in combination with Ag-NPs used it to modify a GCE for the determination of Hg 2+ . Different forms of carbon-containing materials (i.e., graphene, GO, rGO, CNTs, and g-C 3 N 4 ), 29,32,38,45,80,87,91,98,99,101,141,142,144,176,183,184,206 NPs and nanoflakes, 23,87,94,[96][97][98][99]101,102,124,176,182,200,218 and MOFs 208,209,213,216 were combined with the polymers and biopolymers to obtain the modified electrodes. Chelating agents, such as 2,2′,2″,2′′′-(ethane-1,2-diyldinitrilo)tetraacetic acid (EDTA) and L-cysteine, have also been included in these polymer-containing nanocomposites.…”

Biosynthesized silver nanoparticles for electrochemical detection of bromocresol green in river water

“…Electrochemical sensors are considered promising tools for detecting organic pollutants with enhanced sensitivity and selectivity compared with spectroscopic and optical sensors [13,14]. Many electrochemical tools, including voltammetric, amperometric and impedimetric, could be used for pollutant detection [15][16][17][18]. The voltammetric method has been widely studied as a powerful method for dye evaluation based on different techniques, including cyclic voltammetry (CV), linear sweep voltammetry (LSV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV) [19][20][21].…”