Method for detecting fenitrothion pesticide residues in maize based on surface enhanced Raman spectroscopy (SERS)

A fenitrothion and detection method technology, applied in the direction of measuring devices, instruments, and material analysis through optical means, can solve the problems of intervention, pesticide residues, and large consumption of reagents, and achieve accurate detection and reduce interference.

Inactive Publication Date: 2018-11-30
ANHUI UNIVERSITY
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Problems solved by technology

[0003] At present, conventional detection methods for fenitrothion include gas chromatography-mass spectrometry (Gas chromatography-massspectrometer, GC-MS), high performance liquid chromatography (High performance liquid chromatography, HP-LC), although the accuracy of these methods is

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  • Method for detecting fenitrothion pesticide residues in maize based on surface enhanced Raman spectroscopy (SERS)
  • Method for detecting fenitrothion pesticide residues in maize based on surface enhanced Raman spectroscopy (SERS)
  • Method for detecting fenitrothion pesticide residues in maize based on surface enhanced Raman spectroscopy (SERS)

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with accompanying drawing:

[0042] Such as figure 1 Shown a kind of detection method based on fenitrothion pesticide residue in the corn of SERS, this method may further comprise the steps:

[0043] S1. Acquisition of Corn Contaminated Samples

[0044] Dilute the high-concentration fenitrothion solution with 50% ethanol solution to obtain a concentration of 20, 15, 10, 8, 5, 2, 1, 0.5 and 0.4mg / L fenitrothion solution, keep it away from light for subsequent use; A 5 g corn sample was taken, and fenitrothion solutions of different concentrations were added to it to obtain corn contaminated samples with spiked residues of 20, 15, 10, 8, 5, 2, 1, 0.5 and 0.4 μg / g.

[0045] S2, fenitrothion residue extraction

[0046] S21. Crush the corn contamination sample, put it in a 15mL centrifuge tube, add 10mL 50% ethanol, mix evenly with an ultrasonic homogenizer, centrifuge at 4000r / min for 10min, and take th...

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Abstract

The invention relates to a method for detecting fenitrothion pesticide residues in maize based on surface enhanced Raman spectroscopy (SERS). The method comprises the following steps that (1) the fenitrothion residues in a maize contamination sample are extracted, and residue extracting solutions are obtained; (2) the SERS of all the concentrations of the residue extracting solutions is measured,and thus fenitrothion residue spectrums are obtained; (3) base lines in the fenitrothion residue spectrums are removed through a polynomial fitting algorithm, and the fenitrothion residue spectrums are preprocessed through convolution smoothing and a wavelet transform algorithm; (4) main information of the fenitrothion residue spectrums is extracted through a principal component analysis method, and the detection limit of the SERS to the fenitrothion residues in the maize is judged; and (5) an SVR regression model is established, and the fenitrothion residues in the maize are quantitatively analyzed. According to the method, the SERS and a chemometrics method are combined, and thus the fenitrothion pesticide residues in the maize are detected easily, quickly and accurately.

Description

technical field [0001] The invention relates to the technical field of pesticide residue detection, in particular to a method for detecting fenitrothion pesticide residues in corn based on SERS. Background technique [0002] Fenitrothion has good contact and stomach poisoning effects, and can control pests such as Hemiptera and Coleoptera. It is often used for pest control on corn, rice, soybeans and vegetables. Excessive and unreasonable application will cause fenitrothion residue accumulation on crops. These residues are toxic to humans and livestock, and can easily cause choline accumulation in the nervous system, manifested as nausea, vomiting, abdominal pain, diarrhea, coma, etc. Acute poisoning can also be life-threatening. Accurate detection of residues in crops is an important technical method to avoid their damage. [0003] At present, conventional detection methods for fenitrothion include gas chromatography-mass spectrometry (Gas chromatography-massspectrometer,...

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 黄林生王芳翁士状赵晋陵邱梦情王惠
Owner ANHUI UNIVERSITY
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