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Method for quantitatively detecting pesticide residue in grain through THz-TDS technology

A technology for quantitative detection and pesticide residues, applied in measurement devices, material analysis by optical means, instruments, etc., can solve problems such as affecting the authenticity of test samples, waste of drugs, etc., to achieve the effect of reliable identification model and analysis results.

Inactive Publication Date: 2014-12-17
CAPITAL NORMAL UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above method can realize the qualitative and quantitative detection of the antibiotic tetracycline hydrochloride in food, in the sample preparation process, the antibiotic tetracycline hydrochloride to be detected and high-density polyethylene powder are mixed and pressed into tablets, and polyethylene is used as the "background" Detect the content of antibiotics, so the final detection of this method is the relative value of the content of antibiotics in polyethylene, which leads to a far difference from the actual test sample, which affects the authenticity of the test sample; in addition, the introduction of new irrelevant The substance polyethylene will inevitably affect the accuracy of sample detection and waste medicine

Method used

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  • Method for quantitatively detecting pesticide residue in grain through THz-TDS technology
  • Method for quantitatively detecting pesticide residue in grain through THz-TDS technology
  • Method for quantitatively detecting pesticide residue in grain through THz-TDS technology

Examples

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Embodiment 1

[0058] This embodiment provides a method for quantitatively detecting the content of acetamiprid in wheat samples using THz-TDS technology combined with chemometrics, wherein the "wheat sample" uses cake flour (Binzhou Taiyu wheat flour) that does not contain any pesticide residues. Co., Ltd.) was prepared after adding a known amount of acetamiprid (provided by Beijing Beina Chuanglian Biotechnology Research Institute), and the "wheat sample" was used as a blind sample for detection by the method of the present invention. The specific steps are as follows:

[0059] (1) Put the wheat flour for the cake into a pulverizer to pulverize, sieve (200 mesh), put into an oven and dry to obtain primary wheat powder; mix primary wheat powder and acetamiprid powder according to different mass ratios Mixed, transferred to an agate mortar and further ground to obtain the "wheat sample" fine powder, wherein the mass percentage of acetamiprid in the "wheat sample" was 0%, 0.5%, 1.0%, 1.5%, 2....

Embodiment 2

[0098] This embodiment provides a method for quantitatively detecting the content of carbaryl in rice samples using THz-TDS technology combined with chemometrics, wherein the "rice sample" uses rice that does not contain any pesticide residues (Jilin City Jiafu Rice Industry Co., Ltd. Co., Ltd.) was prepared by adding a known amount of carbaryl (provided by Beijing Beina Chuanglian Biotechnology Research Institute), and the "rice sample" was used as a blind sample for detection by the method of the present invention. The specific steps are as follows:

[0099] (1) The rice is put into a pulverizer to pulverize, sieved (100 mesh), put into an oven and dry to obtain rice powder; rice powder and carbaryl powder are mixed according to different mass ratios, and transferred to the agate laboratory. Further grind in a bowl to obtain the "rice sample" fine powder, wherein the mass percentages of carbaryl in the "rice sample" are 0%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% %, 1.0%, 2.0%, 3...

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Abstract

The invention relates to a method for quantitatively detecting pesticide residue in grain through a THz-TDS technology. The method includes following steps: (1) grinding a to-be-detected grain sample and pressing the to-be-detected grain sample into a piece to obtain a to-be-detected grain piece-pressed sample; (2) detecting the to-be-detected grain piece-pressed sample through the THz-TDS technology to obtain a terahertz time-domain spectroscopy; (3) obtaining a frequency domain spectroscopy and an absorption coefficient spectroscopy through Fourier transform and calculation of Timothy and Duvillaret method; (4) randomly dividing the absorption coefficient spectroscopy in a characteristic wave band of the to-be-detected grain piece-pressed sample into a training set sample absorption coefficient spectroscopy and a verification set sample absorption coefficient spectroscopy; and (5) establishing a quantitative analytic model of the absorption coefficient spectroscopy through partial least squares regression method includes a quantitative detection value of each to-be-detected grain sample. The method can actually and effectively achieve quick and accurate quantitative detection of the pesticide residue in grain. An average value of a prediction correlation coefficient (Rv) of the absorption coefficient spectroscopy quantitative analysis model reaches 0.986.

Description

technical field [0001] The invention relates to a method for quantitatively detecting pesticide residues in grain by using THz-TDS technology, and belongs to the technical field of pesticide detection. Background technique [0002] With the rapid development of modern agriculture, the demand and dependence on pesticides for agriculture and agricultural products are increasing. Coupled with the fact that some practitioners lack pesticide knowledge, they have used pesticides in large quantities for a long time or even abused them, which has caused great impact and harm to the environment and human health. For crops, after pesticides are applied to crops, there will often be a small amount of residues in the crops. Long-term ingestion of residual pesticides will seriously affect human health, and will also cause major harm to the body and the ecological environment. Especially in recent years, teratogenic disability and poisoning incidents caused by excessive pesticide residue...

Claims

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Application Information

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IPC IPC(8): G01N21/3563G01N21/3586
Inventor 张卓勇孙彤杨玉平
Owner CAPITAL NORMAL UNIVERSITY
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