Cathodic electrochemical analysis of methyl parathion at bismuth-film-modified glassy carbon electrode

A modified glassy carbon electrode (GCE) compositing multi-walled carbon nanotubes (MWCNTs), Nafion and bismuth film was prepared and applied for the sensitive detection of trace Pb (II). MWCNTs were dispersed into ethanol by ultrasonication in the presence of Nafion and the nanotubes are coated onto the bare GCE. After that, an extra Nafion adhesion agent is added to the electrode. By the in situ plating, a bismuth film was fabricated on the MWCNTs-NA/GCE, making the desired electrode, MWCNTs-NA-Bi/GCE. The modified electrode was characterized by differential pulse anodic stripping voltammetry, scanning electron microscopy, and cyclic voltammetry. A deposition potential of –1.4 V (vs. Ag/AgCl) and a deposition time of 300 s were applied to the working electrode under stirred conditions after optimizing. Nanotubes and Nafion concentrations and pH were carefully optimized to determine trace lead ions by using the electrode as an electrochemical-sensing platform. Nafion effectively increased the stability and adhesivity of the composite film. The MWCNTs-NA-Bi film modified electrode can remarkably increase the anodic peak current of Pb2+. The sensitivity of MWCNTs-NA-Bi/GCE is 4.35 times higher than that of the bare GCE with bismuth film. The prepared electrode showed excellent stability and reproducibility and can be applied for determination of Pb2+ contained wastewater.

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Utilization of a MnO2/polythiophene/rGO nanocomposite modified glassy carbon electrode as an electrochemical sensor for methyl parathion

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-019-01590-9 ◽

2019 ◽

Vol 30 (13) ◽

pp. 12315-12327 ◽

Cited By ~ 4

Author(s):

T. Ramachandran ◽

V. Violet Dhayabaran

Keyword(s):

Electrochemical Sensor ◽

Glassy Carbon Electrode ◽

Glassy Carbon ◽

Methyl Parathion ◽

Carbon Electrode ◽

Modified Glassy Carbon Electrode

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Bismuth and Bismuth-Chitosan modified electrodes for determination of two synthetic food colorants by net analyte signal standard addition method

Open Chemistry ◽

10.2478/s11532-014-0529-z ◽

2014 ◽

Vol 12 (6) ◽

pp. 711-718 ◽

Cited By ~ 10

Author(s):

Karim Asadpour-Zeynali ◽

Fariba Mollarasouli

Keyword(s):

Glassy Carbon Electrode ◽

Glassy Carbon ◽

Standard Addition ◽

Carbon Electrode ◽

Bismuth Film ◽

Modified Glassy Carbon Electrode ◽

Addition Method ◽

Sunset Yellow ◽

Analyte Signal

AbstractIn this paper, an electrochemical application of bismuth film modified glassy carbon electrode for azo-colorants determination was investigated. Bismuth-film electrode (BiFE) was prepared by ex-situ depositing of bismuth onto glassy carbon electrode. The plating potential was −0.78 V (vs. SCE) in a solution of 0.15 mg mL−1 Bi(III) and 0.05 mg mL−1 KBr for 180 s. In the next step, a thin film of chitosan was deposited on the surface of bismuth modified glassy carbon electrode, thus the bismuth-chitosan thin film modified glassy carbon electrode (Bi-CHIT/GCE) was fabricated and compared with bare GCE and bismuth modified GCE.Azo-colorants such as Sunset Yellow and Carmoisine were determined on these electrodes by differential pulse voltammetry. Due to overlapping peaks of Sunset Yellow and Carmoisine, simultaneous determination of them is not possible, so net analyte signal standard addition method (NASSAM) was used for this determination. The results showed that coated chitosan can enhance the bismuth film sensitivity, improve the mechanical stability without caused contamination of surface electrode. The Bi-CHIT/GC electrode behaved linearly to Sunset Yellow and Carmoisine in the concentration range of 5×10−6 to 2.38×10−4 M and 1×10−6 to 0.41×10−4 M with a detection limit of 10 µM (4.52 µg mL−1) and 10 µM (5.47 µg mL−1), respectively

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