scholarly journals Simulating the main stages of chalcopyrite leaching and bioleaching in ferrous ions solution: An electrochemical impedance study with a modified carbon paste electrode

2016 ◽  
Vol 92 ◽  
pp. 229-241 ◽  
Author(s):  
Fabiana A. Arena ◽  
Patrícia H. Suegama ◽  
Denise Bevilaqua ◽  
Ana L.A. dos Santos ◽  
Cecílio S. Fugivara ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Impedance ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Ferrous Ions ◽  
Impedance Study ◽  
Paste Electrode

Simultaneous Determination of L-Tyrosine and Caffeine Based on Their Electrocatalytic Oxidation at a 4-tert-butylcalix[6] arene-Modified Carbon Paste Electrode

2013 ◽  
Vol 96 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Ashwini K Srivastava ◽  
Reena R Gaichore
Keyword(s):  
Simultaneous Determination ◽  
Modified Electrode ◽  
Carbon Paste Electrode ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
Simultaneous Detection ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Paste Electrode

Abstract Simultaneous determination of L-tyrosine and caffeine was performed at a carbon paste electrode modified with 4-tert-butylcalix[6]arene and in situ Ni2+ ions. Surface characterization of the electrode was carried out by means of scanning electron microscopy. Electrochemical impedance diagnosis revealed that oxidation of both molecules is kinetically facile on the modified electrode. The electrochemical behavior of both molecules was studied using cyclic voltammetry, and further quantified using differential pulse voltammetry (DPV). The results revealed a high sensitivity for their simultaneous detection. DPV allowed simultaneous detection of L-tyrosine and caffeine in the range of 10–6 to 10–3 M, with LODs of 2.19 × 10–7 and 4.03 × 10–7 M, respectively. The modified electrode was used for individual determination of L-tyrosine and caffeine in various pharmaceutical formulations and simultaneous monitoring in human body fluids.

scholarly journals Bio-modified carbon paste electrode for the detection of Pb(II) ions in wastewater

2019 ◽  
Vol 80 (11) ◽  
pp. 2058-2066
Author(s):  
P. Mohanraj ◽  
S. Bhuvaneshwari ◽  
M. S. Sreelekshmi ◽  
V. Chandra Sekhar ◽  
K. Narsimhulu ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Metal Ion ◽  
Electrochemical Impedance ◽  
Ion Concentration ◽  
Biomass Composition ◽  
Live Cells ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Toxic Heavy Metals ◽  
Paste Electrode

Abstract Heavy metal pollution in water is a serious environmental concern. Lead is one of the highly toxic heavy metals, and its toxicity is due to its non-degradation characteristic in living organisms. The monitoring of Pb(II) ions concentrations in drinking water is essential for human health and a safe environment. In this work, bio-modified carbon paste electrodes were constructed with live cells and thermally dried biomass (extracted protein) from Pseudomonas aeruginosa cells and employed for the detection of Pb(II) ions from wastewater. The biomass and biosensor preparation and optimization, and the performance of modified biosensors in the detection of Pb(II) ions are discussed here. The effect of various parameters, like pH, biomass composition, scan rate, and metal ion concentration, were studied to obtain the best electrochemical response. Further, the active surface of the electrode and solution characteristics were studies using chronocoulometry and electrochemical impedance spectroscopy. Fourier transform infrared spectroscopy (FTIR) analysis was done to find the functional groups present in the thermally dried biomass. From the present study, it is clear that the thermally dried protein biomass electrode has more sensitivity than the bare carbon paste electrode.

scholarly journals Differential pulse stripping voltammetric determination of paracetamol in pharmaceutical tablet samples using murexide modified carbon paste electrode

2021 ◽  
Vol 14 (3) ◽  
pp. 191-206
Author(s):  
Yonas Beyene Yohannes ◽  
Mohammed Hajole Erba
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Onset Potential ◽  
Pharmaceutical Tablet ◽  
Paste Electrode

As an acetyl aniline drug, paracetamol (PA) has antipyretic and analgesic functions, which is suitable for the remedy of fever, headache and joint ache. The murexide modified carbon paste electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy and compared with bare carbon paste electrode. In this study, murexide-carbon paste electrode (MXCPE) was described for the differential pulse stripping voltammetric determination of paracetamol in pharmaceutical tablet sample. The MXCPE exhibited a better electrocatalytical behavior for the oxidation of PA as evidenced by nearly two folds of current enhancement and a shift of the onset potential by 65 mV in comparison with a bare carbon paste electrode. Differential pulse stripping voltammetry peak currents of PA increased linearly with their concentrations in the ranges of 5-1000 mM with a detection limit of 0.09 mM (S/N = 3). The determination of the analyte in pharmaceutical samples was found in the range 97.6-106.0% of the theoretical values and a recovery result between 94.6 and 96.8% was obtained. For selective determination of PA in the presence of AA was successfully performed.

scholarly journals Electro-Polymerized Titan Yellow Modified Carbon Paste Electrode for the Analysis of Curcumin

Surfaces ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 191-204
Author(s):  
Edwin S. D’Souza ◽  
Jamballi G. Manjunatha ◽  
Chenthattil Raril ◽  
Girish Tigari ◽  
Huligerepura J. Arpitha ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Phosphate Buffer Solution ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Buffer Solution ◽  
Solution Ph ◽  
Real Sample Analysis ◽  
Titan Yellow ◽  
Paste Electrode

A modest, efficient, and sensitive chemically modified electrode was fabricated for sensing curcumin (CRC) through an electrochemically polymerized titan yellow (TY) modified carbon paste electrode (PTYMCPE) in phosphate buffer solution (pH 7.0). Cyclic voltammetry (CV) linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV) approaches were used for CRC detection. PTYMCPE interaction with CRC suggests that the electrode exhibits admirable electrochemical response as compared to bare carbon paste electrode (BCPE). Under the optimized circumstances, a linear response of the electrode was observed for CRC in the concentration range 2 × 10−6 M to 10 × 10−6 M with a limit of detection (LOD) of 10.94 × 10−7 M. Moreover, the effort explains that the PTYMCPE electrode has a hopeful approach for the electrochemical resolution of biologically significant compounds. Additionally, the proposed electrode has demonstrated many advantages such as easy preparation, elevated sensitivity, stability, and enhanced catalytic activity, and can be successfully applied in real sample analysis.

Sign in / Sign up

Export Citation Format

Share Document