Free chlorine detection based on EC’ mechanism at an electroactive polymelamine-modified electrode

• Published in: Electrochemistry communications 2014-09, Vol.46, p.87-90
• Main Authors: Senthilkumar, Krishnan, Zen, Jyh-Myng
• Format: Article
• Language: English
• Subjects: Analytical chemistry; Applied sciences; Biological and medical sciences; Chemistry; Drinking water and swimming-pool water. Desalination; Electrochemical methods; Electrochemistry; Electrodes: preparations and properties; Environmental pollutants toxicology; Exact sciences and technology; Free chlorine; General and physical chemistry; Hypochlorite; Medical sciences; Other electrodes; Pollution; Polymelamine; Screen printed carbon electrode; Toxicology; Water; Water treatment and pollution
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2014.06.018

This work presents the application of an electroactive polymelamine-modified screen printed carbon electrode (polymelamine-SPCE) for free chlorine (free-Cl) detection. It is based on EC’ mechanism for electrocatalytic detection of free-Cl with the azo (i.e.,NN) functionality of polymelamine first reduced electrochemically followed by oxidization with free-Cl in a cyclic manner. The polymelamine-SPCE showed a wide linear range from 10μM to 7mM (R2=0.9957) and a detection limit of 5.5μM (S/N=3) for free-Cl detection by flow injection analysis in neutral media. It was successfully demonstrated for the determination of free-Cl in swimming pool and tap waters. •Free chlorine detection based on a disposable polymelamine-modified electrode•Flow injection analysis of free chlorine in swimming pool and tap waters•A feasible approach at low potential with a wide linear range and low detection limit