Detection of fenitrothion in Radix Puerariae by ZIF-67@MWCNTs modified glassy carbon electrode
Objective To construct a ZIF-67@MWCNTs-modified glassy carbon electrode(GCE)for detecting fenitrothion(FNT)in Radix Puerariae.Methods ZIF-67@MWCNTs was synthesized and ultrasonically dispersed,followed by drop-coating the dispersion onto a glassy carbon electrode to prepare a GCE/ZIF-67@MWCNTs modified electrode.Cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and differential pulse voltammetry(DPV)were used to investigate the electrochemical behavior of FNT on the modified electrode.The electrochemical performance of electrodes modified with different materials,as well as the optimization of drop-coating volume and buffer solution pH,were evaluated.Results Under the optimal conditions of a 5 μL drop-coating volume and buffer pH of 6.5,the linear detection range for FNT was 0.02 to 2.0 μg/mL,with a detection limit of 0.013 μg/mL(S/N=3).Reproducibility,stability and anti-interference experiments demonstrated good performance of the GCE/ZIF-67@MWCNTs electrode.The modified electrode was successfully applied to determine the FNT content in Radix Puerariae,achieving a recovery rate of 94.0%to 108%.Conclusion The constructed modified glassy carbon electrode is suitable for determining FNT in real samples of Radix Puerariae powder.
万方数据
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