scholarly journals Electrochemical determination of hydrogen peroxide at glassy carbon electrode modified with palladium nanoparticles

2013 ◽  
Vol 78 (5) ◽  
pp. 701-711 ◽  
Author(s):  
Addisu Kitte ◽  
Desalegn Assresahegn ◽  
Refera Soreta
Keyword(s):  
Hydrogen Peroxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Palladium Nanoparticles ◽  
Phosphate Buffer Solution ◽  
Reference Electrode ◽  
Electrochemical Determination ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Solution Ph

We report here the modification of glassy carbon electrode (GCE) with palladium nanoparticles and palladium film. The response to hydrogen peroxide on the modified electrode was examined using cyclic voltammetry and amperometry (at -0.2 V vs Ag/AgCl reference electrode in the phosphate buffer solution pH 7.4). The palladium film and palladium nanoparticle modified GCE showed a linear response to hydrogen peroxide in the concentration range between 10 ?M to 14 mM and 1 ?M to 14 mM with detection limit of 6.79 ?M and 0.33 ?M, respectively.

Electrochemical Determination of Albendazole at Glassy Carbon Electrode

2016 ◽  
Vol 99 (6) ◽  
pp. 1522-1526 ◽  
Author(s):  
Jayant I Gowda ◽  
Rahul B Kantikar ◽  
Devaraddi G Harakuni ◽  
Kirankumar Y Jadhav ◽  
Vinay C Chanagoudar ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Saturated Calomel Electrode ◽  
Phosphate Buffer Solution ◽  
Electrochemical Determination ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Solution Ph ◽  
Electrochemical Parameters ◽  
Anodic Peak Current

Abstract In this article, the electrochemical behavior on a glassy carbon electrode (GCE) was investigated and the electrochemical parameters of albendazole (ALB) were calculated. ALB effectively accumulated on the GCE surface and caused a pair of redox peaks at around 1.095 V and 1.028 V and an oxidation peak at 0.844 V (versus saturated calomel electrode) in 0.2 M phosphate buffer solution (pH 3.0). Under optimized conditions, the anodic peak current was linear to the ALB concentration the range of 1.5 × 10−7 M to 4.0 × 10−5 M. The regression equation was: Ipa (10−6 A) = 0.79 [ALB] (μM) + 0.84 (R2 = 0.982). The detection limit 6.08 × 10−8 M was obtained. The proposed method was successfully used to determine ALB content in tablet samples, with satisfactory results.

A Highly Sensitive Non-Enzymatic Sensor Based on a Cu/MnO2/g-C3N4-Modified Glassy Carbon Electrode for the Analysis of Hydrogen Peroxide Residues in Food Samples

2017 ◽  
Vol 70 (10) ◽  
pp. 1118 ◽  
Author(s):  
Gaopeng Dai ◽  
Jingwen Xie ◽  
Cheng Li ◽  
Suqin Liu
Keyword(s):  
Hydrogen Peroxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Phosphate Buffer Solution ◽  
Food Samples ◽  
Security Evaluation ◽  
High Catalytic Activity ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Highly Sensitive

A simple and highly sensitive method for the determination of hydrogen peroxide was developed by electrodepositing Cu and MnO2 onto a g-C3N4 coated glassy carbon electrode in a one-step procedure. The morphology of the fabricated electrode material was characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The electrochemical properties were measured using cyclic voltammetry (CV) and chronoamperometry. The modified sensor exhibits high catalytic activity towards electrochemical oxidation of hydrogen peroxide in a neutral phosphate buffer solution. Within the concentration ranges of 0.01–20 mM and 20–400 mM, the fabricated sensor shows a good linear relationship with the oxidation peak current, the detection limit is 0.85 × 10−6 M. Furthermore, the sensor exhibits high selectivity, good stability, and reproducibility. We successfully applied the sensor to detect hydrogen peroxide residues in food samples with satisfactory results, providing a new approach for food security evaluation.

The Application of Glassy Carbon Electrode Modified by Multi-Walled Carbon Nanotubes for the Fast Determination of Hydroquinone in Wastewater

2014 ◽  
Vol 955-959 ◽  
pp. 1160-1166
Author(s):  
Shao Hua Li ◽  
Ying Ying Zhao ◽  
Jun Qing Yang ◽  
Guo Yan Zhang ◽  
Ju Rui Qi
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A novel multi-walled carbon nanotubes (MWCNTs)-modified glassy carbon electrode (GCE) with excellent stability, repeatability and anti-interference was synthesized and it exhibited an electrocatalytic signal for hydroquinone (HQ) compared to bare GCE, which suggested that the presence of MWCNTs efficiently enhances electron transfer. Various parameters such as pH, modifier volume, and scan rate were optimized using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. Under optimum conditions, linear responses for HQ in 0.1mol·L-1 phosphate buffer solution of pH 6.0 were obtained in the range of 5×10-6 mol·L-1 to 2×10-4 mol·L-1 with detection limits of 2.7×10-6 mol·L-1 (signal-to-noise ratio of 3). Such MWCNTs-modified GCE was successfully applied for the determination of hydroquinone in simulated water samples and can be developed for the the detection of HQ.

scholarly journals Determination of Mercury (II) Ion on Aryl Amide-Type Podand-Modified Glassy Carbon Electrode

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Sevgi Güney ◽  
Gülcemal Yıldız ◽  
Gönül Yapar
Keyword(s):  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Reference Electrode ◽  
Differential Pulse ◽  
Acetate Buffer Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution

A new voltammetric sensor based on an aryl amide type podand, 1,8-bis(o-amidophenoxy)-3,6-dioxaoctane, (AAP) modified glassy carbon electrode, was described for the determination of trace level of mercury (II) ion by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). A well-defined anodic peak corresponding to the oxidation of mercury on proposed electrode was obtained at 0.2 V versus Ag/AgCl reference electrode. The effect of experimental parameters on differential voltammetric peak currents was investigated in acetate buffer solution of pH 7.0 containing 1 × 10−1 mol L−1NaCl. Mercury (II) ion was preconcentrated at the modified electrode by forming complex with AAP under proper conditions and then reduced on the surface of the electrode. Interferences of Cu2+, Pb2+, Fe3+, Cd2+, and Zn2+ions were also studied at two different concentration ratios with respect to mercury (II) ions. The modified electrode was applied to the determination of mercury (II) ions in seawater sample.

Electroanalysis of nicotine at an electroreduced carboxylated graphene modified glassy carbon electrode

2015 ◽  
Vol 7 (3) ◽  
pp. 1147-1153 ◽  
Author(s):  
Hualing Xiao ◽  
Lingen Sun ◽  
Hongling Yan ◽  
Wen Wang ◽  
Jiali Liu ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Phosphate Buffer ◽  
Phosphate Buffer Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution

Nicotine is determined at a glassy carbon electrode modified with partially electroreduced carboxylated graphene by cyclic voltammetry and semi-derivative treatment after enrichment at −1.1 V in 0.1 M pH 7.0 phosphate buffer solution.

scholarly journals Sensitive and Simultaneous Determination of Hydroquinone and Catechol in Water Using an Anodized Glassy Carbon Electrode with Polymerized 2-(Phenylazo) Chromotropic Acid

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Miao Zhang ◽  
Chuang-ye Ge ◽  
Ya-feng Jin ◽  
Liang-bin Hu ◽  
Hai-zhen Mo ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Environmental Pollutants ◽  
Phosphate Buffer Solution ◽  
Chromotropic Acid ◽  
Carbon Electrode ◽  
Mixed Solution ◽  
Buffer Solution ◽  
Recovery Method

Hydroquinone (HQ) and catechol (CT) are considered as environmental pollutants with high toxicity. We have developed a simple electrochemical sensor using an anodized glassy carbon electrode modified with a stable 2-(phenylazo) chromotropic acid- (CH-) conducting polymer (PCH/AGCE). The PCH/AGCE sensor showed good electrocatalytic activity and reversibility towards the redox of HQ and CT in phosphate buffer solution (PBS, pH 7.0). The cyclic voltammetry (CV) in mixed solution of HQ and CT showed that the oxidation peaks of them became well resolved with a peak separation of 0.1 V. The detection limits of HQ and CT were 0.044 and 0.066 μM, respectively, in a wide linear response range of 1–300 μM for both. Moreover, the sensor displayed an excellent selectivity in the presence of common interferences. This study provided a simple, sensitive, and high recovery method for simultaneous and quantitative determination of HQ and CT in aqueous medium.

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