Electrochemical Behavior of Ascorbic Acid at Copper Germanate Nanowire Modified Electrode

2012 ◽  
Vol 159 (3) ◽  
pp. K55-K60 ◽  
Author(s):  
L. Z. Pei ◽  
Y. K. Xie ◽  
Z. Y. Cai ◽  
Y. Yang ◽  
Y. Q. Pei ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Modified Electrode ◽  
Electrochemical Behavior ◽  
Copper Germanate

scholarly journals Cyclic Voltammetric Investigations of Thiazine Dyes on Modified Electrodes

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Amitabha Chakraborty ◽  
Shamsuzzaman Ahamed ◽  
Subrata Pal ◽  
Swapan K. Saha
Keyword(s):  
Diffusion Coefficient ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Modified Electrodes ◽  
Electron Hopping ◽  
Cyclic Voltammetric ◽  
Peak Current ◽  
Quantitative Characteristics ◽  
Thiazine Dyes

Electrochemical behavior of five progressively alkylated thiazine dyes has been investigated at glassy carbon/montmorillonite and glassy carbon/zeolite electrodes. Quantitative characteristics, associated with the positions of peak potentials (Ea and Ec) and current ratios (ia/ic), are measured with scan rates. The peak current observed in the modified electrodes is dependent on both the porosity and nature and number of sites involved in partitioning the complex into film. The values of diffusion coefficient for different dyes have been calculated from electrochemical data. It is suggested that in clay-modified electrode along with physical diffusion the process of electron hopping seems to be most likely.

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 Electrochemical Sensing of Ascorbic Acid, Hydrogen Peroxide and Glucose by Bimetallic (Fe, Ni)−CNTs Composite Modified Electrode

2019 ◽  
Vol 31 (5) ◽  
pp. 851-857 ◽  
Author(s):  
Sayed Tayyab Raza Naqvi ◽  
Bahareh Shirinfar ◽  
Dilshad Hussain ◽  
Saadat Majeed ◽  
Muhammad Naeem Ashiq ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Modified Electrode ◽  
Electrochemical Sensing
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