Electrochemistry of sulfur dioxide, polyphenols and ascorbic acid at poly(3,4-ethylenedioxythiophene) modified electrodes

2012 ◽  
Vol 60 ◽  
pp. 184-192 ◽  
Author(s):  
A. Türke ◽  
W.-J. Fischer ◽  
N. Beaumont ◽  
P.A. Kilmartin
Keyword(s):  
Ascorbic Acid ◽  
Sulfur Dioxide ◽  
Modified Electrodes

scholarly journals Electrochemical determination of ascorbic acid at p-phenylenediamine film-holes modified glassy carbon electrode

2015 ◽  
Vol 80 (9) ◽  
pp. 1161-1175 ◽  
Author(s):  
Bikila Olana ◽  
Shimeles Kitte ◽  
Tesfaye Soreta
Keyword(s):  
Ascorbic Acid ◽  
Detection Limit ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Linear Response ◽  
Modified Electrodes ◽  
Electrochemical Determination ◽  
Carbon Electrode

In this work the determination of ascorbic acid (AA) at glassy carbon electrode (GCE) modified with a perforated film produced by reduction of diazonium generated in situ from p-phenylenediamine (PD) is reported. Holes were intentionally created in the modifier film by stripping a pre-deposited gold nanoparticles. The modified electrodes were electrochemically characterized by common redox probes: hydroquinone, ferrocyanide and hexamineruthenium(III). The cyclic voltammetric and amperometric response of AA using the modified electrodes was compared with that of bare GCE. The bare GCE showed a linear response to AA in the concentration range of 5 mM to 45 mM with detection limit of 1.656 mM and the modified GCE showed a linear response to AA in the concentration range of 5 ?M to 45 ?M with detection limit of 0.123 ?M. The effect of potential intereferents on amperometric signal of AA at the modified GCE was examined and found to be minimal. The inter-electrode reproducibility, stability, and accuracy were determined. The modified electrode showed excellent inter-electrode reproducibility, accuracy and stability. The modified electrode reported is a promising candidate for use in electroanalysis of AA.

scholarly journals Quaternary phosphonium-based (TPQPCl)-ionomer/graphite nanoplatelets composite chemically modified electrodes: a novel platform for sensing applications

2018 ◽  
Vol 6 (48) ◽  
pp. 13293-13304 ◽  
Author(s):  
Sandra Hernandez-Aldave ◽  
Robert B. Kaspar ◽  
Michael P. Letterio ◽  
Afshin Tarat ◽  
Yushan Yan ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Amperometric Detection ◽  
Modified Electrodes ◽  
Chemically Modified Electrodes ◽  
Graphite Nanoplatelets ◽  
Chemically Modified ◽  
Sensing Applications ◽  
Sensing Platform ◽  
Coated Electrodes

Ionomer (TPQPCl)/graphite nanoplatelet-coated electrodes are developed as a new sensing platform for amperometric detection of ascorbic acid.

Spectra Characterization of Mo(W)-S-Ag Cluster Compounds Films Modified Silver Electrodes and their Electrochemical Behavior

2011 ◽  
Vol 317-319 ◽  
pp. 560-563
Author(s):  
Dao Hua Li ◽  
Xin Quan Xin
Keyword(s):  
Ascorbic Acid ◽  
Modified Electrodes ◽  
Cluster Compounds ◽  
Oxidation Peak ◽  
Silver Surface ◽  
Ft Ir ◽  
Silver Electrodes ◽  
Ag Cluster ◽  
Catalytic Effects

The modified electrodes of Mo(W)-S-Ag cluster compounds films on silver surface were investigated by FT-IR, FT-Raman and XPS. The new modified electrodes were applied to the catalytic oxidation of ascorbic acid. This sort of catalytic effects can be inferred because the oxidation peak potentials of ascorbic acid moved to more negation compared with the bare Ag electrode and the oxidation peak currents increased with the increasing of ascorbic acid concentration. The overpotentials of ascorbic acid were significantly reduced. The cycle voltammograms (CV) measurement revealed the linear relationship between the oxidation peak current and the concentration of ascorbic acid ranging among 0.001~ 0.06 mol.L-1.

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