Graphite-polystyrene composite with enhanced electrochemical and electroanalytical performance

Author(s)

Surkov, Andrei M. ^[1] ; Queiroz, Rodrigo G. ^[1] ; Rinco, Rafael S. ^[1] ; Rios, Alejandro G. ^[1] ; Gutz, Ivano G. R. ^[1] ; Baccaro, Alexandre L. B. ^[1] ; Angnes, Lucio ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Talanta; v. 223, n. 2 FEB 1 2021.
• Web of Science Citations: 0

Abstract

A new composite electrode (G-PSE) was developed from graphite powder and expanded polystyrene (EPS, Styrofoam) by simply dissolving the foam in chloroform, incorporating the graphite particles under mixing and volatilizing the solvent at 80 degrees C. The resulting rigid black composite can be softened with acetone and so it can easily be molded to any shape, e.g., into a PTFE tube with an electric contact, to build the electrode. A 75% graphite content (w/w) was found appropriate for preparing the G-PSE with a working potential similar to that of carbon paste electrodes, superior mechanical stability and a much faster response to ferrocyanide, close to reversible and similar to that of the much more expensive glassy carbon electrode. Applications of the G-PSE to dipyrone and paracetamol quantification in pharmaceutical formulations were demonstrated. The results accomplished by flow injection analysis with amperometric detection at the G-PSE were successfully validated against standards methods. (AU)

• FAPESP's process: 17/13137-5 - Formation and properties of hemiesters of carbonic acid in aqueous medium
• Grantee: Claudimir Lucio Do Lago
• Support type: Research Projects - Thematic Grants
• FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
• Grantee: Lauro Tatsuo Kubota
• Support type: Research Projects - Thematic Grants