A Pt Nanoparticle Electrode for Nitrite Determination in Solution

In this study, a Pt nanoparticle electrode which had advantages of high selectivity, accuracy, and anti-interference capacity was successfully fabricated for quantitative measurement and analysis of nitrite concentration under neutral conditions with various interference ions. Current-time curve was used for the electrodeposition of Pt nanoparticles on the surface of the pretreated Pt disk electrode, and the deposition time was 100 seconds. The prepared nano-Pt electrode had an electrochemical catalytic reductive activity for nitrite. Nitrite reductive peak current was linear correlation with nitrite concentrations in solutions. The life time of the modified electrode was at least 150 days at room temperature (at least 1000 determinations). The present method is simple, does not require any pre-treatment procedure, and does carry very good repeatability and reproducibility. Moreover, the proposed electrochemical method was also validated by spectrophotometry in artificial and real wastewater samples. (C) 2014 The Electrochemical Society.