• Nia, Pooria Moozarm
• Yusoff, Ismail
• Rezayi, Majid
• Gholami, Mehrdad
• Alias, Yatimah

Abstract

n this study, a novel procedure for creating cationic response in polypyrrole is introduced. This method was applied to produce an iron II ion selective sensor based on carbon screen-printed electrode in the presence of pyrrole, iron II sulfate, and Sodium dodecyl sulfate (SDS). The formational mechanism of this procedure is discussed. The composition and morphology of the prepared modified electrode is characterized by the Field Emission Scanning Electron Microscope, X-ray Powder Diffraction, and Fourier Transform Infrared Spectrum. The produced iron II sensor can be used for potentiometric and voltammetric detection. The potentiometric dynamic range was 1 × 10 −6 to 1 × 10 −1  M with a Nernstian slope of 29.7 ± 0.5 mV per decade and a detection limit of 8.78 × 10 −7  M. In addition, the differential pulse voltammetry was applied for the optimized electrode and the dynamic range from 1 × 10 −9 to 1 × 10 −5  M with a detection limit of 5.8 × 10 −10 was obtained. The prepared electrode has good potentiometric selectivity for Iron II with respect to several cations. Electrochemical Impedance spectroscopy showed the charge transfer dramatically decreased with optimized electrode. This sensor was successfully used for the determination of iron II concentration in ferrous fumarate tablet using both potentiometric and differential pulse voltammetry methods.

Topics

• impedance spectroscopy
• morphology
• Carbon
• Sodium
• iron
• pulse voltammetry