Rapid Detection of Nitrofuran and Its Metabolites by Using Carboxylic Multi-walled Carbon Nanotubes Modified Glassy Carbon Electrode

摘要

An electrochemical method using carboxylic multi-walled carbon nanotubes (MWCNTs-COOH)modified glassy carbon electrode (GCE) was described for detecting nitrofurazone (NF) andsemicarbazide (SEM) residual. The chemical structure and morphological features of carboxylic multiwalled carbon nanotubes were determined by FTIR spectroscopy and scanning electron microscope.The electrochemical behavior of NF and SEM on MWCNTs-COOH/GCE was also investigated bycyclic voltammetry (CV). And the effect of the buffer pH and scan rate was optimized. Under theoptimized experimental conditions, the linear relationship between the peak current and theconcentration of NF and SEM was determined using the amperometry (AMP). The linear relationshipof NF was Ip(μA) =-21.050-0.095c(μmol L-1), r = 0.999, with a detection limit of 2.24×10-7 mol L-1(S/N=3). The linear relationship of SEM was Ip(μA) =-0.269+0.0599c(mol L-1), r=0.998, with adetection limit of 1.88×10-7 mol L-1 (S/N=3). Finally, the modified electrode was successfully appliedin the real sample and the average recoveries for NF and SEM were 91.1~94.0% and 92.9~98.0%,respectively.