Electrochemical Sensing of Nitrite at Aminophenol-Formaldehyde Polymer/Phosphomolybdic Acid Nanocomposite Modified Electrode

An aminophenol-formaldehyde polymer/phosphomolybdic acid nanocomposite modified carbon paste electrode for detection of nitrite was developed. The integration of polymer matrix to form materials is an effective way to harness the electrochemical activity. The aminophenol-formaldehyde polymer/phosphomolybdic acid nanocomposite modified carbon paste electrode showed high electrocatalytic activity for nitrite reduction, enabling the detection of nitrite within a linear range of 10.0-1000 mu M (r = 0.998). The limit of detection was 9.8 mu M (S/N = 3). The method showed excellent selectivity for nitrite detection in the presence of phosphate, acetate, ammonium, fluoride, chloride and nitrate.