Use of the sulfide minerals pyrite and chalcopyrite as electrochemical sensors in non-aqueous solutions. The potentiometric titration of weak acids in alcohols

• Authors: Ljiljana Mihajlović , Snežana Nikolić-Mandić , Branislav Vukanović , Ranđel Mihajlović
• Languages of publication: EN

Abstracts

EN

Natural monocrystalline pyrite and chalcopyrite were examined as new indicator electrodes for the potentiometric titration of weak acids in tert-butanol and iso-propanol. The electrodes investigated demonstrated a linear dynamic response for p-toluenesulfonic acid concentrations in the range from 0.1 to 0.001 M, with a Nernstian slope of 48 mV per decade for pyrite in tert-butanol. Sodium methylate, potassium hydroxide and tetrabutylammonium hydroxide (TBAH) proved to be suitable titrating agents. The response time was less than 12 s and the lifetime of the electrodes was higher than 1 year. The advantages of the electrodes are long-term stability, rapid response, reproducibility, easy preparation and low cost. [...]

Keywords

EN

Pyrite; Chacopyrite; Sensor; Non-aqueous media; Alcohols

• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 4
• Pages: 900-908

Dates

published

1 - 12 - 2009

online

6 - 10 - 2009

Contributors

author

Ljiljana Mihajlović

• Department of Chemistry, Faculty of Sciences, University of Kragujevac, 34 000, Kragujevac, Serbia

author

Snežana Nikolić-Mandić

• Faculty of Chemistry, University of Belgrade, 11 000, Belgrade, Serbia

author

Branislav Vukanović

• Technical High School, 37000, Kruševac, Serbia

author

Ranđel Mihajlović

• Department of Chemistry, Faculty of Sciences, University of Kragujevac, 34 000, Kragujevac, Serbia,

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Identifiers

DOI

10.2478/s11532-009-0074-3