Examination of Carbon Paste Electrode/TiO2 Nanocomposite as Electrochemical Sensor for Detecting Profenofos Pesticide

• Published in: Surface engineering and applied electrochemistry 2021-05, Vol.57 (3), p.387-396
• Main Authors: Thamrin Azis, Maulidiyah, Maulidiyah, Muzakkar, Muh. Zakir, Ratna, Ratna, Aziza, Siti Wahyuni, Bijang, Catherina M., Agus Salim, La Ode, Prabowo, Owink Agung, Wibowo, Dwiprayogo, Nurdin, Muhammad
• Format: Article
• Language: English
• Subjects: Carbon; Chemical sensors; Electrochemical analysis; Electrodes; Engineering; Insecticides; Machines; Manufacturing; Nanocomposites; Organophosphates; Pesticides; Processes; Reproducibility; Smart materials; Titanium dioxide
• ISSN: 1068-3755; 1934-8002
• DOI: 10.3103/S1068375521030029

This study reports the preparation and performance of a smart material—a carbon paste electrode combined with TiO 2 semiconductor (CPE/TiO 2 ) as electrochemical sensor for detecting profenofos—a toxic organophosphates group insecticide widely used in agriculture. Such techniques as real samples tests and electrochemical tests were used to investigate the following parameters: a scan rate, an electrode response, a limit of detection (LoD), and repeatability. Based on the obtained results, the best mass composition of TiO 2 combined with CPE was found to be in a ratio of 1 : 1 : 5, with an anodic peak current ( I pa ) of 150 μA, an anodic peak potential ( E pa ) of 0.87 V, and an optimal scan rate measurement of 0.5 V s –1 . The LoD based on a linearity curve with a value of 4.0 × 10 –5 μM was also observed, and a repeatability test against the working electrode was performed until the 30th day, using the Horwitz ratio of 0.16. A good electrochemical performance of the working electrode tested against a real sample showed the specifically detected profenofos with I pa value of 7.0 × 10 –5 μM.