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Vol. 32, No. 8(2), S&M2292

ISSN (print) 0914-4935
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Sensors and Materials
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Sensors and Materials, Volume 31, Number 4(1) (2019)
Copyright(C) MYU K.K.
pp. 1215-1224
S&M1847 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2019.2206
Published: April 11, 2019

Coulometric Analysis of Nitrite Using Electrochemically Activated Carbon Felt Electrode [PDF]

Satrio Kuntolaksono and Hiroaki Matsuura

(Received November 27, 2018; Accepted January 21, 2019)

Keywords: modified carbon felt electrode, nitrogen-containing functional groups, absolute determination, coulometric sensor, nitrite

In this study, we report the development of an absolute determination method based on potential-controlled coulometric analysis using carbon-felt-electrode-introduced nitrogen-containing functional groups fabricated by the electrode oxidation of ammonium carbamate solution for measuring nitrite. The potential-controlled coulometric cell was constructed by using a working electrode consisting of a carbon felt electrode that was electro-oxidized at +1.1 V (vs Ag/AgCl) in 0.1 M ammonium carbamate solution. When the applied potential of the sensor cell was +0.75 V, the oxidized current of nitrite was immediately observed by adding 10 µL of 1 mM nitrite. In addition, the electron number of the electrode reaction was two electron paths from the estimation of the electrical charge of nitrite detection. This finding indicates that the proposed determination method resulted in the absolute quantity analysis of nitrite. The current vs time curves indicate that the determination of nitrite was finished completely in a relatively short time (~30 s). The relative standard deviation (RSD) for ten successive measurements of 1 mM nitrite was 2.2%. This indicates that our coulometric method can be used for the absolute determination of the nitrite concentration in practical applications.

Corresponding author: Hiroaki Matsuura


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Cite this article
Satrio Kuntolaksono and Hiroaki Matsuura, Coulometric Analysis of Nitrite Using Electrochemically Activated Carbon Felt Electrode, Sens. Mater., Vol. 31, No. 4, 2019, p. 1215-1224.



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