| Benzopyrene(BaP) is a common polycyclic aromatic hydrocarbon compound,which has attracted wide attention due to its strong carcinogenicity to the human body.In this paper,an electrochemical luminescence sensor for the detection of BaP was constructed based on a covalent organic framework modified electrode.Firstly,the covalent organic framework material,CTpPa-2 formed by the condensation reaction of 1,3,5-triformylphloroglucinol(CTp) and 2,5-dimethyl-p-phenylenediamine (Pa-2),was modified on the electrode surface by drop coating method,then a simple and rapid BaP electrochemical luminescence sensor with good stability was constructed by combining the modified electrode with a luminol-hydrogen peroxide system.The morphology and electrochemical properties of CTpPa-2 modified carbon electrode were characterized by scanning electron microscopy,differential pulse voltammetry,cyclic voltammetry,galvanostatic charge/discharge and electrochemical luminescence.The feasibility for the determination of BaP was also investigated.Under the optimized experimental conditions,there was a good linear relationship between luminescent intensity and BaP concentration in the range of 50-600 nmol/L with a correlation coefficient(r2) of 0.995 1,and the limit of detection(S/N=3) was 5.60 nmol/L.The proposed sensor was applied in the detection of BaP in roasted meat sample,and the results obtained were similar to those of HPLC method,indicating that this method has a good application prospect. |