An Electropolymerized Rhodamine B sensing Film-Based Electrochemical Sensor for Nitrite with High Sensitivity and Selectivity

The fabrication of an electropolymerized Rhodamine B (PRhB) sensing film based electrochemical sensor and its application for electrochemical detection of nitrite are described. The PRhB film modified GC electrode exhibited good catalytic activity towards the electrochemical oxidation of nitrite. The effects of the experimental variables such as the thickness of the film, solution pH values and the working potential were investigated using steady-state amperometry. The present sensor (PRhB-modified electrode) had a fast response towards NO2 ( less than 10 s), and excellent linear relationships were obtained in the concentration range of 0.5 M-7.0 mM, with a detection limit of 0.1 M (S/N = 3). The sensitivity of the sensor was calculated to be 308.1 A mM−1 cm−2. The possible interferences from several common ions were tested. Moreover, the stability and reproducibility of this sensor were evaluated with satisfying results