Hg(II) Analysis Using Poly(cysteine)-rGO Electrode

2020 ◽  
Vol 18 (3) ◽  
pp. 179-187
Author(s):  
J. Jency Feminus ◽  
P. N. Deepa
Keyword(s):  
Modified Electrode ◽  
Metal Ion ◽  
Square Wave Voltammetry ◽  
Electrochemical Behaviour ◽  
Electrochemical Determination ◽  
Mercury Determination ◽  
Selective Determination ◽  
Wave Voltammetry ◽  
Reduced Graphene

In the present work, we have developed a sensitive platform for the selective determination of Hg(II) ions based on reduced graphene oxide (rGO) electrode modified with poly cysteine (Poly-Cys). The Poly-Cys/rGO modified electrode was characterised by SEM, ATR-IR and its electrochemical behaviour was investigated through cyclic voltammetry and square wave voltammetry. The synergistic effect of rGO and poly-cysteine favoured the complexation of Hg(II) ions onto the surface of the modified electrode. The ions were then anodically stripped and the corresponding voltammograms recorded. The process of complexation followed by stripping was repeated with increasing concentrations of the metal ion. The linear range for the electrochemical determination of Hg(II) using the modified electrode was found to be from 0.05 to 2.7 μM with a detection limit of 0.006 μM. In addition, the electrode also exhibited good stability with negligible sensitivity towards interfering metal ions. The analytical applicability of the modified electrode was investigated by carrying out mercury determination in water samples obtained from various sources.

scholarly journals Simultaneous and selective electrochemical determination of hydroquinone, catechol and resorcinol at poly(1,5-diaminonaphthalene)/glassy carbon-modified electrode in different media

RSC Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 6346-6355 ◽  
Author(s):  
Khalid Mahmoud Hassan ◽  
Abla Ahmed Hathoot ◽  
Mohamed Fathi Abo oura ◽  
Magdi Abdel Azzem
Keyword(s):  
Cyclic Voltammetry ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Square Wave Voltammetry ◽  
Electrochemical Determination ◽  
Electrochemical Behaviors ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Glassy Carbon Modified Electrode

Electrochemical behaviors of hydroquinone, catechol and resorcinol were examined at poly(1,5-diaminonaphthalene)/glassy carbon-modified electrode by cyclic voltammetry, square wave voltammetry and chronoamperometry techniques in different media.

Electrochemical determination of cadmium(II) using dithizone assisted ion transfer and eletrolyte dropping electrode

2011 ◽  
Vol 76 (10) ◽  
pp. 1177-1186
Author(s):  
Feifei Shu ◽  
Shaoai Xie ◽  
Jinping Jia
Keyword(s):  
Square Wave Voltammetry ◽  
Methyl Isobutyl Ketone ◽  
Electrochemical Determination ◽  
Ion Transfer ◽  
Isobutyl Ketone ◽  
Ligand Complex ◽  
Wave Voltammetry ◽  
Maximum Value ◽  
Relative Standard

The transfer of Cd(II) assisted by dithizone (DzH2) present in methyl isobutyl ketone (MIBK) at water–MIBK interface was systematically investigated by novel electrolyte dropping electrode (EDE) using cyclic voltammetry (CV) and square wave voltammetry (SWV). The protonation of DzH2 at polarized liquid–liquid interface was studied. The stoichiometry of resulting metal ligand complex was formulated. Transfer peak current was proportional to the bulk concentration of the Cd(II) varied between 1 μM to 0.1 mM and the maximum value of relative standard deviation was about 3.17%. The presented procedure was successfully applied for determination of Cd(II) in real samples.

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