Method for detecting content of pesticide in cereal by utilizing terahertz time-domain spectroscopy

A terahertz time-domain and spectroscopic technology, applied in the field of detection of pesticide content in grains, can solve problems such as affecting the authenticity of detection samples, waste of drugs, etc., and achieve accurate evaluation of prediction ability and stability, rapid and accurate quantitative detection, and sample preparation. simple effect

Inactive Publication Date: 2014-12-03
CAPITAL NORMAL UNIVERSITY +2
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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 antibio

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  • Method for detecting content of pesticide in cereal by utilizing terahertz time-domain spectroscopy
  • Method for detecting content of pesticide in cereal by utilizing terahertz time-domain spectroscopy
  • Method for detecting content of pesticide in cereal by utilizing terahertz time-domain spectroscopy

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Embodiment

[0038] This embodiment provides a quantitative detection of imidacloprid content in rice samples using terahertz time-domain spectroscopy, wherein the "rice sample" to be tested is rice that does not contain any pesticide residues (provided by Zhangjiakou Inspection and Quarantine Bureau, Hebei Province) Prepared after adding a known amount of imidacloprid (provided by Beijing Bei Nachuanglian Biotechnology Research Institute), and using the method of the present invention to detect the "rice sample" to be tested as a blind sample, the specific steps are as follows:

[0039] (1) Put the rice into a pulverizer to pulverize it, grind it and sieve it (100 mesh, particle size≤150 μm), put it into an oven and dry it to obtain rice powder; mix the rice powder and imidacloprid powder according to different mass ratios , transferred to an agate mortar and further ground to obtain the fine powder of the "rice sample" to be tested, wherein the mass percentages of imidacloprid in the "ric...

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Abstract

The invention relates to a method for detecting the content of a pesticide in cereal by utilizing a terahertz time-domain spectroscopy. The method comprises the following steps of grinding and then tabletting a to-be-detected cereal sample to obtain a to-be-detected cereal tablet sample, testing the to-be-detected cereal tablet sample by directly adopting a terahertz time-domain spectroscopy system, acquiring a terahertz area spectrum signal to be used as a sample signal, acquiring a terahertz time-domain spectrum signal under a nitrogen atmosphere as a reference signal, acquiring an absorptive coefficient spectrum of the to-be-detected cereal tablet sample, acquiring a characteristic wave band of a target pesticide, classifying the absorptive coefficient spectrum of the to-be-detected cereal tablet sample to a corrected set of sample absorptive coefficient spectrum and a verification set of sample absorptive coefficient spectrum, establishing a quantitative analysis model by utilizing a partial least-squares regression method, and acquiring a quantitative detection value of each to-be-detected cereal sample. The method can truly and effectively detect the pesticide residue in the cereal quantitatively, rapidly and accurately, and the prediction square correlation coefficient (R2) of the quantitative analysis model reaches up to 0.9903.

Description

technical field [0001] The invention relates to a method for detecting pesticide content in grain by using terahertz time-domain spectroscopy 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 pestic...

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Application Information

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IPC IPC(8): G01N21/3563G01N21/3586
Inventor 张卓勇陈泽炜杨玉平
Owner CAPITAL NORMAL UNIVERSITY
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