Selective Electrochemical Sensing of Dopamine and Ascorbic Acid Using Carbon Paste Electrode Modified with Cobalt Schiff Base Complex and a Surfactant

In this article we have studied the electrochemical behavior of cocaine hydrochloride on the surface of a carbon paste electrode chemically modified with a Schiff base complex, namely [FeIII(salen)], [ZrOII(salen)], or [NiII(salen)], during voltametric analyses. Among the tested complexes, [NiII(salen)] provided amperometric and thermal stability and it was only degraded at temperatures above 400 ºC. To prepare the cocaine hydrochloride was used hydrochloric acid (HCl 1 mol L-1) after we tested the electrode, the HCl did not cause electrode passivation. In this study we can see that the voltammetric analyses revealed a satisfactory result, that the peak current obtained between 0.1 and 0.2 V (vs. Ag/AgCl) varied linearly with cocaine hydrochloride concentration and the average amperometric sensitivity, the LOD, and the LOQ were 5.5 μmol L-1, 0.945 μmol L-1, and 3.16 μmol L-1, respectively.

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Simultaneous determination of acetaminophen, dopamine and ascorbic acid using a PbS nanoparticles Schiff base-modified carbon paste electrode

Comptes Rendus Chimie ◽

10.1016/j.crci.2014.07.001 ◽

2015 ◽

Vol 18 (4) ◽

pp. 438-448 ◽

Cited By ~ 14

Author(s):

Nasrin Soltani ◽

Nahid Tavakkoli ◽

Nasrin Ahmadi ◽

Fateme Davar

Keyword(s):

Ascorbic Acid ◽

Schiff Base ◽

Simultaneous Determination ◽

Carbon Paste Electrode ◽

Modified Carbon Paste Electrode ◽

Carbon Paste ◽

Pbs Nanoparticles ◽

Paste Electrode

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An efficient electrochemical sensing of hazardous catechol and hydroquinone at direct green 6 decorated carbon paste electrode

Scientific Reports ◽

10.1038/s41598-021-93749-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

K. Chetankumar ◽

B. E. Kumara Swamy ◽

S. C. Sharma ◽

S. A. Hariprasad

Keyword(s):

Carbon Paste Electrode ◽

Limit Of Detection ◽

Tap Water ◽

Differential Pulse ◽

Electrochemical Sensing ◽

Carbon Paste ◽

Pulse Voltammetry ◽

Two Peaks ◽

Paste Electrode ◽

Scanning Electron

AbstractIn this proposed work, direct green 6 (DG6) decorated carbon paste electrode (CPE) was fabricated for the efficient simultaneous and individual sensing of catechol (CA) and hydroquinone (HY). Electrochemical deeds of the CA and HY were carried out by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) at poly-DG6-modfied carbon paste electrode (Po-DG6-MCPE). Using scanning electron microscopy (SEM) studied the surface property of unmodified CPE (UCPE) and Po-DG6-MCPE. The decorated sensor displayed admirable electrocatalytic performance with fine stability, reproducibility, selectivity, low limit of detection (LLOD) for HY (0.11 μM) and CC (0.09 μM) and sensor process was originated to be adsorption-controlled phenomena. The Po-DG6-MCPE sensor exhibits well separated two peaks for HY and CA in CV and DPV analysis with potential difference of 0.098 V. Subsequently, the sensor was practically applied for the analysis in tap water and it consistent in-between for CA 93.25–100.16% and for HY 97.25–99.87% respectively.

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