Electrochemical Detection of Nitrite Based on Reaction with 2,3-Diaminonaphthalene

A voltammetric method for the determination of trace amounts of nitrite is proposed. In acidic solution, 2,3-diaminonaphtalene (DAN) reacts with nitrite to form the 1-N-naphtotriazole. At the end of this reaction, the unreacted DAN was measured at a carbon paste electrode by using differential pulse...

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Bibliographic Details
Published in:Analytical letters 2005-09, Vol.38 (12), p.1943-1955
Main Authors: Idrissi, Laila, Amine, Aziz, El Rhazi, Mama, Cherkaoui, Fouzia El Moursli
Format: Article
Language:English
Subjects:
2,3-diaminonaphthalene
Analytical chemistry
BIA
Chemistry
differential pulse voltammetry
Electrochemical methods
Exact sciences and technology
General, instrumentation
Nitrite
Spectrometric and optical methods
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Summary:A voltammetric method for the determination of trace amounts of nitrite is proposed. In acidic solution, 2,3-diaminonaphtalene (DAN) reacts with nitrite to form the 1-N-naphtotriazole. At the end of this reaction, the unreacted DAN was measured at a carbon paste electrode by using differential pulse voltammetry. Different parameters, such as pH of the medium, effect of the reaction time, and the effect of DAN concentration on the percentage of signal decrease, have been optimised. Detection limit of 0.2 µmol L −1 was achieved. Results were improved by using bath injection analysis technique which permit 120 analysis per hour. Nitrites were determined in the real samples. The results have been compared with those obtained by spectrophotometric method based on the Griess reaction, and they are satisfactory. The method developed can be applied for rapid detection and monitoring trace of nitrite for field measurements because the instrumentation required is portable.
ISSN:0003-2719
1532-236X
DOI:10.1080/00032710500232752