Cocaine electrooxidation behavior, mechanism, and kinetics on a carbon paste electrode chemically modified with a cobalt or copper Schiff base complex

2021 ◽  
pp. 100363
Author(s):  
Alex Soares Castro ◽  
Larissa Silva de Azevedo ◽  
Aline Thais Bruni ◽  
Matheus Manoel Teles de Menezes ◽  
Edward Ralph Dockal ◽  
...  
Keyword(s):  
Schiff Base ◽  
Carbon Paste Electrode ◽  
Schiff Base Complex ◽  
Carbon Paste ◽  
Base Complex ◽  
Chemically Modified ◽  
Mechanism And Kinetics ◽  
Paste Electrode

scholarly journals Development of Carbon Paste Electrode Chemically Modified with Schiff Base Complexes for Forensic Analysis of Cocaine

2021 ◽  
Author(s):  
Ana Beatriz da Silva ◽  
Alex Castro ◽  
Marcelo de Oliveira
Keyword(s):  
Schiff Base ◽  
Carbon Paste Electrode ◽  
Schiff Base Complex ◽  
Forensic Analysis ◽  
Schiff Base Complexes ◽  
Carbon Paste ◽  
Chemically Modified ◽  
Cocaine Hydrochloride ◽  
Electrode Passivation ◽  
Paste Electrode

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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