Investigation of Nitrite Detection with Electrochemical Impedance Spectroscopy

Malak Talbi, Ammar Al-Hamry, Priscila Rios Teixeira, Leonardo G. Paterno, Mounir Ben Ali, Olfa Kanoun

Abstract

An electrochemical impedance spectroscopy study is described for the determination of nitrite. A screen printed carbon electrode (SPCE) was modified with biocompatible gold nanoparticles stabilized by a polymer (branched polyethyleneimine). The modified SPCE exhibits high electro catalytic activity toward nitrite oxidation, typically at a working potential at around 0.5 V (vs. Ag/AgCl). Sensitive impedimetric detection of nitrite is demonstrated. The studied detection range extends from 1 to 10000 µM. Based on found results, the sensor’s performances will be calculated (limit of detection, sensitivity, linear range...) and further studies like stability and selectivity test will be continued.

Keywords

Nitrite detection, Electrochemical sensors, Gold nanoparticles, Screen Printed Electrodes, Electrochemical Impedance Spectroscopy

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DOI

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IMEKO TC

TC19 - Environmental Measurements

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