Electrochemical characterization and application of Ni-RuO2 as a pH sensor for determination of petroleum oil acid number |
| |
Authors: | R Karimi Shervedani H R Zare Mehrdjardi S H Kazemi Ghahfarokhi |
| |
Institution: | 1. Department of Chemistry, University of Isfahan, Isfahan, 81746-73441, I.R. Iran
|
| |
Abstract: | Electrochemical characterization and application of nickel ruthenium dioxide (Ni-RuO2) as a pH sensor for the determination of petroleum oil acid number is described. The sensor consists of RuCl3 thermally decomposed onto the upper side of a polycrystalline nickel electrode at 400 °C in an open furnace. The advantages of the sensor are: (i) easy preparation, (ii) fast response in a large pH range, (iii) high physical and chemical stability, and (iv) excellent reproducibility as determined by the reproducible linear variation of charge transfer resistance (Rct) as a function of overpotential (η) obtained by electrochemical impedance spectroscopy (EIS), and the Nernstian slope of the electrode potential in a wide range of pH (1.5–12.5) obtained by potentiometric measurements. The potentiometric selectivity coefficients of the sensor toward some anions and cations were evaluated in aqueous solution. The characterized Ni-RuO2 pH sensor was successfully tested for the determination of petroleum oil acid number. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|