Vegetable oil pesticide residue detection method based on three-dimensional fluorescence spectroscopic technology

Abstract

The invention discloses a vegetable oil pesticide residue detection method based on a three-dimensional fluorescence spectroscopic technology. The method comprises the steps that a fluorescence spectrometer is utilized to acquire an apparent spectrum of all vegetable oil pesticide residue samples, instrument excited emission correction is performed to obtain a real spectrum of the samples, and then pretreatment operation on spectral data is completed through a polynomial smoothing method; the number of optimal fluorescence components of the samples is determined by use of an APTLD model in combination with a nuclear consistent diagnosis method, a resolution spectrum of all the components is obtained, and the resolution spectrum is fitted with the real spectrum in a database to realize qualitative analysis of all the components of the samples; and a pesticide spectrum and a corresponding concentration are trained through a BP neural network algorithm to find a mapping relation, the resolution spectrum is input into the neural network completing training, and quantitative analysis of all the components of the to-be-detected samples is realized. Through the method, vegetable oil pesticide residue detection can be completed rapidly and accurately, and realization of a vegetable oil detection system which is easy to operate, fast in detection and portable is benefited.

Description

technical field [0001] The invention relates to the field of fluorescence spectrum analysis methods, in particular to a method for detecting pesticide residues in vegetable oil based on three-dimensional fluorescence spectrum technology. Background technique [0002] The use of pesticides plays an important role in resisting insects and diseases during the growth of crops. However, with the large and unreasonable use of pesticides in recent years, the problem of pesticide residues in agricultural products exceeding the standard has occurred frequently, which seriously threatens people's health and causes social problems. of great concern. Vegetable oil is usually extracted from plant seeds through pressing and other processes, and is a processed product of crops. Plants may suffer from various diseases and insect pests during the planting process, such as cutworms, Spodoptera litura, etc., which need to be sprayed with pesticides for control. This has the risk of excessive ...

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Problems solved by technology

In the 201710543277.2 invention patent applied by Zhang Lifu, Yang Hang, and Zhang Xia, a method and system for detecting pesticide residues in vegetables, the solar reflection spectrum data of pesticide residues on the surface of vegetables are combined with the pre-established vegetable pesticide residue index model library to determine the The pesticide residue index on the surface of vegetables, using the measured pesticide residue index and the preset threshold to determine the pesticide residue level of the sample to be tested, this method can achieve rapid detection, but its detection accuracy is poor

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