Electrochemical Detection of Sudan I Using a Multi-Walled Carbon Nanotube/Chitosan Composite Modified Glassy Carbon Electrode — Oak Academic Publishing
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Electrochemical Detection of Sudan I Using a Multi-Walled Carbon Nanotube/Chitosan Composite Modified Glassy Carbon Electrode
Department of Chemistry, East China Normal University, Shanghai, China
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Department of Chemistry, East China Normal University, Shanghai, China
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Department of Chemistry, East China Normal University, Shanghai, China
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Department of Chemistry, East China Normal University, Shanghai, China
,
Department of Chemistry, East China Normal University, Shanghai, China
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Department of Chemistry, East China Normal University, Shanghai, China
1 Department of Chemistry, East China Normal University, Shanghai, China
2 Department of Chemistry, East China Normal University, Shanghai, China
3 Department of Chemistry, East China Normal University, Shanghai, China
4 Department of Chemistry, East China Normal University, Shanghai, China
5 Department of Chemistry, East China Normal University, Shanghai, China
6 Department of Chemistry, East China Normal University, Shanghai, China
In this work, a simple and sensitive electrochemical method was developed to determine Sudan I by cyclic voltammetry and differential pulse voltammetry using a glassy carbon electrode modified with a chitosan/carbon nanotube composite. In cyclic voltammetry, Sudan I exhibited a well-defined oxidation peak located at 0.72 V at the multi-walled carbon na notube (MWCNT)/chitosan-modified GCE. The determination conditions, including pH, scan rate, and chitosan: MWCNT mass ratio at the modified electrode, were optimized. Under the optimum experimental conditions, Sudan I could be linearly detected by differential pulse voltammetry with a detection limit of 3.0 × 10 - 8 mol?L - 1 .
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