Electrochemical Behavior and Voltammetric Determination of 2,4,6-Triaminopyrimidine at Glassy Carbon Electrode Modified with Multi-Walled Carbon Nanotubes/Nafion

A multi-wall carbon nanotubes (MWCNTs) composite with Nafion was modified on a glass carbon electrode. The modified electrode was then used as a voltammetric sensor in detecting 2,4,6-triaminopyrimidine (TAP). The surface morphology of the Nafion/MWCNTs composite film was characterized by atomic force microscopy (AFM), and the electrochemical behavior of TAP at this sensor was investigated in detail. The results indicated that the Nafion/MWCNTs modified electrode exhibited efficient electrocatalytic oxidation for TAP with relatively high sensitivity, stability and lifetime. Under the optimized condition using linear sweep voltammetry (LSV), the Nafion/MWCNTs modified electrode exhibited a linear voltammetric response for TAP in the concentration range of 2.0 × 10–7 to 3.6 × 10–5 mol L–1, with a detection limit of 5.0 × 10–8 mol L–1. The electrode was applied to detect TAP added to human blood serum, with an average recovery value of 101.3%.