scholarly journals ELECTROCHEMICAL SYNTHEZIS AND CHARACTERIZATION OF POLYPYRROLE FOR DODECYLSULFATE SENSOR MEMBRANE

2010 ◽  
Vol 7 (3) ◽  
pp. 249-253 ◽  
Author(s):  
Abdul Haris Watoni ◽  
Suryo Gandasasmita ◽  
Indra Noviandri ◽  
Buchari Buchari
Keyword(s):  
Aqueous Solution ◽  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Supporting Electrolyte ◽  
Linear Potential ◽  
Potential Response ◽  
Real Samples ◽  
Sensor Membrane ◽  
Pyrrole Monomer

A conducting polymer, polypyrrole, has been electrochemically synthesized from pyrrole monomer using cyclic voltammetry technique in aqueous solution in the presence of HDS dopant and KNO3 supporting electrolyte. The polymer was deposited on the surface of an Au-wire and the modified electrode obtained was then used as dodecylsulfate (DS-) ion sensor electrode. The best performance PPy-DS modified-Au electrode conditioned in the air system without HDS or SDS solution gave linear potential response for the concentration range of 1.0 x 10-5 - 1.0 x 10-3 M, sensitivity of 54.5 mV/decade, detection limit of 1.0 x 10-5 M, and response time of 23 - 30 second.  The electrode showed good selectivity towards other anions, therefore can be used to determine SDS concentration in real samples system without any change of the samples matrix.   Keywords: polypyrrole, SDS, cyclic voltammetry

scholarly journals Effect of the Supporting Electrolyte on Chloroform Reduction at a Silver Electrode in Aqueous Solutions

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 525
Author(s):  
Anna M. Brudzisz ◽  
Agnieszka Brzózka ◽  
Grzegorz D. Sulka
Keyword(s):  
Aqueous Solution ◽  
Cyclic Voltammetry ◽  
Supporting Electrolyte ◽  
Reduction Peak ◽  
Electrocatalytic Reduction ◽  
Silver Surface ◽  
Concerted Mechanism ◽  
Ag Electrode ◽  
Wide Range ◽  
First Time

Herein, we report, for the first time, a comparative study on the electrocatalytic reduction of chloroform on silver in different aqueous supporting electrolytes. Cyclic voltammetry measurements were performed at a wide range of scan rates and concentrations of CHCl3 using 0.05 M NaClO4, NaH2PO4, and Na2HPO4 as supporting electrolytes. We observed that a type of supporting electrolyte anion strongly influences both the potential as well as the current density of the chloroform reduction peak, mainly due to the presence of OH− in an alkaline Na2HPO4 solution, which is a specifically interacting anion. Moreover, the highest sensitivity of the Ag electrode toward CHCl3 reduction was observed in a neutral NaClO4 aqueous solution. It was found that the electroreduction of chloroform at the silver surface occurs via a concerted mechanism regardless of the type of the studied supporting electrolyte.

Electrochemical characterization of luminol and its determination in real samples

2014 ◽  
Vol 6 (19) ◽  
pp. 7809-7813 ◽  
Author(s):  
Gulcemal Yildiz ◽  
Ugur Tasdoven ◽  
Necati Menek
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Solution Ph ◽  
Real Samples ◽  
Pulse Voltammetry

The electrochemical behavior of luminol, an important molecule in forensic science, was studied in Britton–Robinson buffer solution (pH 2–pH 13) at a glassy carbon electrode using cyclic voltammetry and differential pulse voltammetry techniques.

scholarly journals Electrocoating Polypyrrole on Gold-Wire Electrode as Potential Mediator Membrane Candidate for Anionic Surfactant Electrode Sensor

2020 ◽  
Vol 23 (5) ◽  
pp. 167-176
Author(s):  
Abdul Haris Watoni ◽  
Indra Noviandri ◽  
Muhammad Nurdin ◽  
La Ode Ahmad Nur Ramadhan
Keyword(s):  
Cyclic Voltammetry ◽  
Conducting Polymer ◽  
Limit Of Detection ◽  
Supporting Electrolyte ◽  
Sodium Dodecyl ◽  
Gold Wire ◽  
Potential Range ◽  
Wire Electrode ◽  
Potential Response ◽  
Potential Mediator

The development of polypyrrole as a potential mediator membrane candidate for sodium dodecyl sulfate (SDS) sensor electrode has been investigated. The polypyrrole membrane was synthesized electrochemically from the pyrrole and coated at the surface of a 1.0 mm diameter of the gold-wire electrode. Electropolymerization of pyrrole and coating of the polypyrrole produced was performed by cyclic voltammetry technique in the electrochemical cell containing supporting electrolyte of 0.01 M NaClO4 with an optimum potential range of -0.9 V–1.0 V, the scanning rate of 100 mV/s, an electric current of 2 mA, and running of potential scanning of 10 cycles. By using the similar optimal parameters of cyclic voltammetry, electropolymerization of 0.01 M pyrrole solution containing 0.001 M SDS also produces a polypyrrole membrane coated at the gold-wire electrode surface. These coated electrodes have the potential response-ability toward DS- anions in the concentration range of 10-7 M–10-5 M with a limit of detection of 10-7 M and sensitivity of electrode of 9.9 mV/decade. This finding shows that the SDS solution’s role is as supporting electrolyte and also as a source of DS- dopant during the pyrrole electropolymerization processes. Dopants are trapped in the polymer membrane during the electrochemical formation of polypyrrole and role as ionophores for DS- anion in the analyte solution. A potential response to the electrode phenomena is excellent basic scientific information for further synthesis of conducting polymer and development of conducting polymer-coated wire electrode model, especially in the construction of ion-selective electrode (ISE) for the determination of anionic surfactants with those models.

scholarly journals Metal Complexes of Mixed Nucleobases. Part I: Synthesis and Characterization of Copper(II), Zinc(II), Cadmium(II) and Mercury(II) Complexes of Adenine and Uracil

2016 ◽  
Vol 64 (2) ◽  
pp. 127-133
Author(s):  
Humaira Yeasmin ◽  
MS Rahman ◽  
AA Shaikh ◽  
Pradip K Bakshi
Keyword(s):  
Aqueous Solution ◽  
Cyclic Voltammetry ◽  
Magnetic Susceptibility ◽  
Redox Properties ◽  
Synthesis And Characterization ◽  
Bidentate Ligands ◽  
Cadmium Complexes ◽  
X Ray ◽  
Metal Contents

The complexes of Cu(II), Zn(II), Cd(II) and Hg(II) with adenine (AdeH) and uracil (UraH) have been synthesized and characterized by a combination of metal contents estimation, IR, UV-vis spectral data, thermogravimetric analysis (QSTG, TG and DSC) and magnetic susceptibility measurement. All the complexes are micro-crystalline, slightly soluble in water and decompose at high temperature. Both adenine and uracil deprotonated under experimental condition and then ligated to the metal ions as bidentate ligands through N(3) and N(9) of adeninato (Ade), and through N(3) and C(2)=O of uracilato (Ura) anions. On the basis of the metal contents, the complexes are formulated as [M(C5H4N5O)(C5H4N5)(H2O)2] [M = Cu(II), Zn(II) and Hg(II)] and [Cd(C5H4N5)(C4H3N2O2)(H2O)2].2H2O. The redox properties of copper and cadmium complexes were examined in aqueous solution by cyclic voltammetry. The voltammograms show quasi-reversible behavior for both the complexes. The X-ray powder diffraction study of the copper complex indicates that it is poorly crystalline in nature. Dhaka Univ. J. Sci. 64(2): 127-133, 2016 (July)

Nanomaterial LaNiTiO3-Fe3O4-based peroxidase biomimetic sensor with high sensitivity

2020 ◽  
Vol 16 ◽  
Author(s):  
Yanhong Xu ◽  
Ying Sun ◽  
Qiao Feng
Keyword(s):  
Detection Limit ◽  
Low Cost ◽  
Supporting Electrolyte ◽  
High Sensitivity ◽  
Fast Response ◽  
H2o2 Concentration ◽  
Current Time ◽  
Real Samples ◽  
Wide Range ◽  
Biomimetic Sensor

Background: Hydrogen peroxide (H2O2) is widely present in various fields. And H2O2 plays quintessential role in variety of biomolecular processes. H2O2 concentration level is an essential biological parameter in monitoring and maintaining the physiological balance of a living cell, and its variation will cause some related diseases. Therefore, it is extremely significant to fabricate biosensor with low cost which can quickly, accurately and sensitively detect H2O2 in a wide range. The aims of this paper are to explore a novel electrochemical sensor with high intrinsic peroxidase-like activity, high sensitivity and stability to detect effectively H2O2 concentration in real samples. Methods: The chemical modified electrode LaNiTiO3-Fe3O4/GCE is fabricated based on nanomaterial LaNiTiO3-Fe3O4 by simply process, and its electrochemical properties are investigated in the supporting electrolyte of 0.1 M NaOH by the techniques of cyclic voltammetry and current-time curves on an electrochemical workstation with a conventional threeelectrode system. Results: LaNiTiO3-Fe3O4 nanoparticles show good peroxidase-like activity for H2O2 at a low applied potential of +0.50 V. Under the optimum conditions, the peroxidase biomimetic sensor LaNiTiO3-Fe3O4/GCE exhibits a wide linear response for H2O2 oxidation in the range of 0.05 μM - 3.0 mM (R = 0.9994) with a high sensitivity of 3946.2 μA∙mM1 ∙cm-2 and fast response time of 2 s, and the detection limit of H2O2 is found to be ca. 5.15 nM (S/N = 3). Moreover, the biosensor presents a good repeatability, stability and anti-interference. Satisfactory results were obtained when the sensor LaNiTiO3-Fe3O4/GCE is applied to determine H2O2 in real samples. All of these results provide support to practical application. Conclusion: A highly sensitive peroxidase biomimetic sensor based on LaNiTiO3-Fe3O4 with nano-scaled material is successfully explored, and shows good activity for H2O2. The proposed biosensor with simple and low cost has exhibited excellent advantages of quick response, wide linear range, low detection limit, high sensitivity, long-term stability and good anti-interference ability, which provides promising applications.

Preparation and Electrochemical Properties of Poly(p-Chloroaniline)

2013 ◽  
Vol 634-638 ◽  
pp. 1981-1984
Author(s):  
Chun Yu Zhang ◽  
Hai Jun Niu ◽  
Lin Zhang ◽  
Xu Duo Bai
Keyword(s):  
Aqueous Solution ◽  
Ir Spectroscopy ◽  
Electrochemical Properties ◽  
Supporting Electrolyte ◽  
Linear Potential ◽  
Scan Rate ◽  
Ft Ir ◽  
Uv Visible ◽  
Electronic Microscope ◽  
Ft Ir Spectroscopy

Polymerization of p-chloroaniline (CA) was achieved electrochemically in aqueous solution containing H2SO4 as supporting electrolyte. The films were obtained by applying sequential linear potential scan rate 20mV/s between -0.5 to 1.5V versus Ag/AgCl electrode. The polymer was characterized by UV-visible and FT-IR spectroscopy. We observed the morphologies of PCA films through the scanning electronic microscope (SEM), showing island protruding structure. The Tafel curves showed that PCA can be used as anti-corrosion material.

Zn(II)-selective poly (vinyl chloride) (PVC) membrane electrode based on Schiff base ligand 2-benzoylpyridine semicarbazone as an ionophore

2020 ◽  
Vol 40 (10) ◽  
pp. 842-847
Author(s):  
Shankar Suman ◽  
Ram Singh
Keyword(s):  
Schiff Base ◽  
Detection Limit ◽  
Vinyl Chloride ◽  
Pvc Membrane ◽  
Membrane Electrode ◽  
Sodium Tetraphenylborate ◽  
Potential Response ◽  
Selective Electrode ◽  
Poly Vinyl Chloride ◽  
Pvc Membrane Electrode

AbstractA new poly (vinyl chloride) (PVC) membrane electrode using 2-benzoylpyridine semicarbazone as membrane carrier with dioctylphthalate as plasticizer and sodium tetraphenylborate (NaTBP) as anion excluder has been fabricated and investigated as Zn(II)-selective electrode. Best potential response is observed for the composition PVC 30%, plasticizer 58%, NaTBP 8% and ionophore 4% (w/w). The sensor showed a linear stable response over a concentration range of 1.0 × 10−2–4.56 × 10−6 M with a detection limit of 2.28 × 10−6 M and a response time <10 s. The electrode can be used for at least six months without any divergence in potential.

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