scholarly journals Development of polyindole/tungsten carbide nanocomposite-modified electrodes for electrochemical quantification of chlorpyrifos

2019 ◽  
Vol 10 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Pragati Joshi ◽  
Sameena Mehtab ◽  
M. G. H. Zaidi ◽  
Tanvi Tyagi ◽  
Anjali Bisht
Keyword(s):  
Square Wave Voltammetry ◽  
Electrochemical Impedance ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Modified Electrodes ◽  
Polymer Nanocomposite ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Viable Method ◽  
Detection And Quantification

Abstract The present investigation deals with the development of a novel polymer nanocomposite (PNCs) electrodes for simple, selective and sensitive detection of chlorpyrifos (CHL). PNCs were developed using surfactant facilitated polymerization of indole using different concentrations (wt%) of WC ranging 5–30. Formation of PNCs was ascertained through diversified analytical methods. Electrodes were derived from PNCs over stainless steel substrate for electrochemical quantification of CHL. With concentration of WC, the DC conductivity (10−2 × S/cm) of electrodes was increased ranging 3.54–0.75 at 313 K. Electrochemical impedance spectroscopy reveals well stability of electrodes in phosphate buffer (PBS, 0.1 M) at pH 7.4. The performance of electrodes towards detection and quantification of CHL was investigated through square wave voltammetry. Study reveals that detection and quantification of CHL were dependent on concentration of WC in nanocomposites. Square wave voltammetry reveals that the electrode derived from PNCs with 5 wt% of WC has rendered highest limits of detection and quantification of CHL (10−8 mol/L) up to 5.94 and 18. This work describes a viable method of preparation of synergistic blend of WC in PIN matrix having high electrical conductivity, rapid electron shift, huge surface area and enhanced stability for fast and précised electrochemical detection of CHL. Graphic abstract

scholarly journals Electrochemical Detection of Phenanthrene Using Nickel Oxide Doped PANI Nanofiber Based Modified Electrodes

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Omolola E. Fayemi ◽  
Abolanle S. Adekunle ◽  
Eno E. Ebenso
Keyword(s):  
Nickel Oxide ◽  
Square Wave Voltammetry ◽  
Modified Electrodes ◽  
Oxidation Potential ◽  
Current Response ◽  
Modified Glassy Carbon Electrode ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Doped Polyaniline ◽  
Uv Visible

A nickel oxide doped polyaniline nanofibers (PANI-NiO) based electrochemical sensor was constructed for detection of phenanthrene. Successful synthesis of PANI-NiO nanocomposite was confirmed with techniques such as SEM, XRD, EDX, FTIR, and UV-visible spectroscopy. The electrocatalytic oxidation of phenanthrene on PANI-NiO on modified glassy carbon electrode (GCE-PANI-NiO) was studied using cyclic voltammetry, square wave voltammetry, and impedance spectroscopy and discussed. Results showed that detection of phenanthrene was enhanced by the nanostructure of PANI-NiO film. The square wave voltammetry analysis shows a very low detection limit of 0.732 pM for phenanthrene with the linear range of 7.6 pM–1.4 × 10−11 M. The Tafel value of 227 mVdec−1suggests adsorption of phenanthrene oxidation intermediates on the GCE-PANI-NiO electrode. The GCE-PANI-NiO modified electrodes gave better performance towards phenanthrene in terms of current response, oxidation potential, current recovery, stability, and resistance to electrode fouling effects.

scholarly journals Electrochemical Hg2+ detection at tannic acid-gold nanoparticle modified electrodes by square wave voltammetry

The Analyst ◽  
2018 ◽  
Vol 143 (9) ◽  
pp. 2035-2041 ◽  
Author(s):  
Alex L. Suherman ◽  
Sabine Kuss ◽  
Eden E. L. Tanner ◽  
Neil P. Young ◽  
Richard G. Compton
Keyword(s):  
Gold Nanoparticle ◽  
Tannic Acid ◽  
Square Wave Voltammetry ◽  
Modified Electrodes ◽  
Electrochemical Sensing ◽  
Square Wave ◽  
Wave Voltammetry

We report the electrochemical sensing of Hg2+ based on tannic acid capped gold nanoparticle (AuNP@TA) complexes.

scholarly journals Analysis of sulfamethoxazole by square wave voltammetry using new carbon paste electrode

2018 ◽  
Vol 8 (4) ◽  
pp. 281-289
Author(s):  
Izabel Cristina Eleotério ◽  
Marco Aantonio Balbino ◽  
José Fernando De Andrade ◽  
Bruno Ferreira ◽  
Adelir Aparecida Saczk ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Veterinary Medicine ◽  
Carbon Paste Electrode ◽  
Square Wave Voltammetry ◽  
Carbon Paste ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Analytical Curve ◽  
Paste Electrode ◽  
Detection And Quantification

In this work a new model of carbon paste electrode was employed to determine sulfamethoxazole (SMX), an antibiotic used to treat infections in human and veterinary medicine, by the square wave voltammetric modality (SWV). More specifically, the elec­trochemical behavior of SMX was investigated by cyclic voltammetry (CV), and the quantitative analysis of SMX was provided by SWV. The analytical curve was obtained with a linear correlation coefficient (r) of 0.985 and standard deviation (SD) of 0.005 μA. Limits of detection and quantification were found as 2.3×10-6 and 7.7×10-6 mol L-1, respectively. According to the obtained results, the new carbon paste prototype electrode can successfully be employed in this kind of electroanalytical applications.

Characterization of the Electrocatalytic Response of Monolayer-Modified Electrodes with Square-Wave Voltammetry

2012 ◽  
Vol 116 (20) ◽  
pp. 11206-11215 ◽  
Author(s):  
J. Gonzalez ◽  
A. Molina ◽  
F. Martinez Ortiz ◽  
E. Laborda
Keyword(s):  
Square Wave Voltammetry ◽  
Modified Electrodes ◽  
Square Wave ◽  
Wave Voltammetry

An electrochemical detection of cadmium (II) and lead (II) ions using a polymer-modified electrode with a Schiff base by square wave voltammetry

2021 ◽  
Author(s):  
Mohammed Qasim Mohammed ◽  
Hani Khalil Ismail ◽  
Hasan Fisal Alesary ◽  
Stephen Barton
Keyword(s):  
Schiff Base ◽  
Modified Electrode ◽  
Electrochemical Detection ◽  
Square Wave Voltammetry ◽  
Electrochemical Behaviour ◽  
Modified Electrodes ◽  
Polymer Coatings ◽  
Square Wave ◽  
Enhanced Sensitivity ◽  
Wave Voltammetry

Abstract The work herein concentrates on the electrochemical detection of heavy metal ions, specifically cadmium and lead ions. The introduction and modification of functional groups such as Schiff bases had led to an enhanced sensitivity of the electrode to analytes. In this study, a platinum electrode has for the first time been modified with poly(3,4- ethylenedioxythiophene) (PEDOT/Schiff base) in CH2Cl2 containing Bu4NPF6 for use to detection cadmium (II) and lead (II) ions. The structure and morphology of the polymer coatings were characterised by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), respectively. The electrochemical synthesis and redox state response in monomer-free synthesised films have been studied by cyclic voltammetry. Moreover, the effect of scan rate on the electrochemical behaviour of the modified electrodes was also studied. The voltammetric findings have been used to calculate the surface coverage required for the polymer films and the stability of polymer electrodes in the monomer-free solutions. Square wave voltammetry (SWV) was applied for the determination of cadmium (II) and lead (II) ion concentrations and to assess the effects of pH on aqueous samples. The limits of detection for the modified electrode for cadmium (II) and lead (II) were found to be 0.95 μg L-1 and 1.84 μg L-1, respectively. These findings revealed that modified films can be considered good candidates for application in electrochemical detection devices

Sign in / Sign up

Export Citation Format

Share Document