Electrochemical sensing of hydroxylamine using a wax impregnated graphite electrode modified with a nanocomposite consisting of ferric oxide and copper hexacyanoferrate

The authors describe a wax-impregnated graphite electrode modified with ferric oxide (Fe 2 O 3 ) and copper hexacyanoferrate(II), and its application as an electrochemical sensor for hydroxylamine. The presence of Fe 2 O 3 nanoparticles enhance the electron transfer kinetics and electrocatalytic act...

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Veröffentlicht in:Mikrochimica acta (1966) 2016-06, Vol.183 (6), p.2013-2021
Hauptverfasser: Allibai Mohanan, Vinu Mohan, Kacheri Kunnummal, Aswini, Biju, Valsala Madhavan Nair
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Sprache:eng
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Zusammenfassung:The authors describe a wax-impregnated graphite electrode modified with ferric oxide (Fe 2 O 3 ) and copper hexacyanoferrate(II), and its application as an electrochemical sensor for hydroxylamine. The presence of Fe 2 O 3 nanoparticles enhance the electron transfer kinetics and electrocatalytic activities, and also enlarge the surface area of the modified electrode. As compared to the unmodified electrode, 16.9 and 30.1 fold enhancements in amperometric response was observed for copper hexacyanoferrate(II) and the nanocomposite modified electrodes, respectively. Also, the presence of Fe 2 O 3 in the nanocomposite enhances the anodic current response by 1.78 fold when compared to copper hexacyanoferrate(II) alone modified electrode. The electron transfer coefficient, electron transfer rate constant, diffusion coefficient and catalytic rate constant for the electro-oxidation of hydroxylamine were determined. Amperometry performed at a working voltage of 750 mV (vs. Ag/AgCl) revealed a detection range that extends from 0.8 μM to 100 μM, a detection limit of 0.5 μM (at an S/N ratio of 3) and a sensitivity of 0.0924 mA⋅mM −1 . The modified electrode is remarkably stable and was successfully applied to the determination of hydroxylamine in spiked water samples. Graphical abstract The nanocomposite of ferric oxide and copper hexacyanoferrate(II) modified wax impregnated graphite electrode was developed for the electrochemical detection of hydroxylamine from environmental water samples. Amperometric detection at 750 mV (vs. Ag/AgCl) possessed a limit of detection of 0.5 μM.
ISSN:0026-3672
1436-5073
DOI:10.1007/s00604-016-1839-y