The amount of pyrethroid pesticides used in citrus and other fruits in China ranks first in the world.Rapid screening and supervision of their residues are of great significance to ensure the safety of China’s fruits.This article studied the preparation conditions of multifunctional nanomaterials (NaYF4∶Yb, Er-Fe3O4@MIP), and used Fourier transform infrared spectroscopy and transmission electron microscopy to characterize the material.Through the adsorption and selectivity experiments of NaYF4∶Yb, Er-Fe3O4@MIP, it was verified that NaYF4∶Yb, Er-Fe3O4@MIP had good selectivity and adsorption performance for four kinds of pyrethroid pesticides.Based on the above results, a pyrethroid pesticide-specific sensing system based on this material was constructed to rapidly detect pyrethroid pesticide residues in citrus fruits.Results showed that the sensing system had a good linear relationship with pyrethroid pesticides (deltamethrin, cypermethrin, cyfluthrin, and fenvalerate) in the range of 0.02-2.5 mg/L, and the detection limits were respectively 6.17×10-4, 6.65×10-4, 7.21×10-4, 9.61×10-4, 6.43×10-4 mg/L.Combined with the exclusive pre-treatment technology for fresh citrus fruits, actual citrus samples were tested.The spiked recovery rate was 87.9%-105.8%, and the relative standard deviation was 0.53%-6.41%.The method is accurate, sensitive and stable, and can be used for the detection of pyrethroid pesticides in actual citrus samples.
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