چكيده لاتين :
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 (h) 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.
