Determination of 2,4-Dinitrophenol with Carbon Nanotubes Modified Glassy Carbon Electrode

Carbon nanotubes (CNT′s) were dispersed in DMF solution,and the mixture obtained was dropped on the surface of glassy carbon electrode (GCE) to prepare CNT′s modified GCE (CNT′s-GCE).It was shown that significant catalytic action of CNT′s-GCE was observed on the reaction of 2,4-Dinitrophenol (2,4-DNP) at the electrode,giving a pair of oxidation peak and reduction peak,as well as two individual reduction peaks.The reaction conditions were studied and optimized,and an electrochemical method was proposed for the direct determination of 2,4-DNP.Linear relationship between the oxidation peak current and concentration of 2,4-DNP was obtained in the range from 2.5×10-6 to 1.0×10-4mol·L-1,with the detection limit (3S/N) of 3.7×10-7mol·L-1.