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Sensors 2002, 2(4), 153-163; doi:10.3390/s20400153

Natural Monocrystalline Pyrite as Sensor for Potentiometric Redox Titrations. Part I. Titrations with Permanganate

1,* , 2 and 1
1 Technical Faculty Bor, University of Belgrade, P.O.Box 50, 19210 Bor, Yugoslavia 2 Faculty of Science, University of Kragujevac, 34000 Kragujevac, Yugoslavia
* Author to whom correspondence should be addressed.
Received: 9 April 2002 / Accepted: 23 April 2002 / Published: 30 April 2002
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Results obtained in potentiometric titrations of Fe(II), Mn(II), Fe(CN)64-, C2O42- and As(III) with standard potassium permanganate solution, are presented. The titration end point (TEP) was detected with a universal electrode whose sensor is natural crystalline pyrite. The titrations of As(III) were carried out in HCl (1.2 M) and H2SO4 solutions (0.1- 4.5 M), whereas oxalate was determined in H2SO4 (0.1-4.5 M). Iron(II) and hexacyanoferrate(II) were titrated in H2SO4 and also in H3PO4 solutions (0.1-4.5 M). The titrations of Mn(II) were performed in H2P2O72- media at pH 4.0, 5.0, 6.0 and 7.0. The results obtained by using the pyrite electrode were compared with those obtained by the application of a Pt-electrode, and good agreement, reproducibility and accuracy were obtained. The potentials in the course of the titration and at the end-point (TEP) are rapidly established. The potential changes at the TEP ranged from 90 to 330 mV/0.1 mL, depending on the titrated system. The highest changes were observed in titrations of Fe(II) in H3PO4 (240-330 mV/0.1 mL). Reversed titrations were also performed and accurate and reproducible results were obtained.
Keywords: Pyrite; Sensor; Permanganate; Potentiometry; Reductants Pyrite; Sensor; Permanganate; Potentiometry; Reductants
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Antonijevic, M.M.; Mihajlovic, R.P.; Vukanovic, B.V. Natural Monocrystalline Pyrite as Sensor for Potentiometric Redox Titrations. Part I. Titrations with Permanganate. Sensors 2002, 2, 153-163.

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