Sensitive Voltammetric Detection of Trace Heavy Metals in Real Water Using Multi-Wall Carbon Nanotubes/Nafion Composite Film Electrode

2011 ◽  
Vol 29 (4) ◽  
pp. 805-812 ◽  
Author(s):  
He Xu ◽  
Qiaoli Zheng ◽  
Ping Yang ◽  
Jianshe Liu ◽  
Litong Jin
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotubes ◽  
Composite Film ◽  
Film Electrode ◽  
Multi Wall Carbon Nanotubes ◽  
Trace Heavy Metals ◽  
Voltammetric Detection

Stripping voltammetric detection of trace heavy metals using gold ultramicroelectrode arrays

2014 ◽  
Author(s):  
Manuel Gutierrez-Capitan ◽  
Antoni Baldi ◽  
Cecilia Jimenez-Jorquera ◽  
Cesar Fernandez-Sanchez ◽  
Raquel Gomez ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Trace Heavy Metals ◽  
Voltammetric Detection ◽  
Gold Ultramicroelectrode

scholarly journals Application of the Enzymatic Electrochemical Biosensors for Monitoring Non-Competitive Inhibition of Enzyme Activity by Heavy Metals

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2939 ◽  
Author(s):  
Ashrafi ◽  
Sýs ◽  
Sedláčková ◽  
Farag ◽  
Adam ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotubes ◽  
Competitive Inhibition ◽  
Silver Ions ◽  
Clinical Analysis ◽  
Indirect Determination ◽  
Multi Wall Carbon Nanotubes ◽  
Inhibition Effect ◽  
Direct Adsorption

The inhibition effect of the selected heavy metals (Ag+, Cd2+, Cu2+, and Hg2+) on glucose oxidase (GOx) enzyme from Aspergillus niger (EC 1.1.3.4.) was studied using a new amperometric biosensor with an electrochemical transducer based on a glassy carbon electrode (GCE) covered with a thin layer of multi-wall carbon nanotubes (MWCNTs) incorporated with ruthenium(IV) oxide as a redox mediator. Direct adsorption of multi-wall carbon nanotubes (MWCNTs) and subsequent covering with Nafion® layer was used for immobilization of GOx. The analytical figures of merit of the developed glucose (Glc) biosensor are sufficient for determination of Glc in body fluids in clinical analysis. From all tested heavy metals, mercury(II) has the highest inhibition effect. However, it is necessary to remember that cadmium and silver ions also significantly inhibit the catalytic activity of GOx. Therefore, the development of GOx biosensors for selective indirect determination of each heavy metal still represents a challenge in the field of bioelectroanalysis. It can be concluded that amperometric biosensors, differing in the utilized enzyme, could find their application in the toxicity studies of various poisons.

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