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Amperometric determination of nitrite using natural fibers as template for titanium dioxide nanotubes with immobilized hemin as electron transfer mediator
Amperometric determination of nitrite using natural fibers as template for titanium dioxide nanotubes with immobilized hemin as electron transfer mediator
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Date
2018-03-01
Authors
Balasubramanian Ranjani
Jayaprakasham Kalaiyarasi
Loganathan Pavithra
Thiyagarajan Devasena
Kannaiyan Pandian
Subash Chandra Bose Gopinath
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Publisher
National Library of Medicine
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Abstract
A sensing device was constructed for the amperometric determination of nitrite. It is based on the use of titanium dioxide (TiO2) nanotubes template with natural fibers and carrying hemin acting as the electron mediator. A glassy carbon electrode (GCE) was modified with the hemin/TNT nanocomposite. The electrochemical response to nitrite was characterized by impedance spectroscopy and cyclic voltammetry. An amperometric study, performed at a working potential of + 0.75 V (vs. Ag/AgCl), showed the sensor to enable determination of nitrite with a linear response in the 0.6 to 130 μM concentration range and with a 59 nM limit of detection. Corresponding studies by differential study voltammetry (Ep = 0.75 V) exhibited a linear range from 0.6 × 10−6 to 7.3 × 10−5 M with a limit of detection of 84 nM. The sensing device was applied to the determination of nitrite in spiked tap and lake water samples.
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Keywords
Electrocatalytic oxidation,
Kenaf fiber,
Limit of detection,
Nanocomposites,
Water samples