A method for quantitative detection of pesticide residues in grains using terahertz frequency band FTIR technology
A quantitative detection and terahertz technology, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of wasting drugs and affecting the authenticity of test samples, and achieve fast and accurate quantitative detection and simple sample preparation.
Active Publication Date: 2016-08-17
CAPITAL NORMAL UNIVERSITY +1
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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
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[0043] This embodiment provides a method of using terahertz frequency band FTIR technology combined with chemometrics to quantitatively detect the content of carbaryl in rice samples, wherein the "rice sample" uses rice that does not contain any pesticide residues (Jilin City Jiafu Rice Industry Co., Ltd. Produced by the company) after 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:
[0044] (1) Put the rice into a pulverizer to grind it, sieve it (100 mesh), put it into an oven and dry it to obtain rice powder; mix the rice powder and carbaryl powder according to different mass ratios, and transfer to the agate research institute. Further grind in the bowl to obtain the "rice sample" fine powder, wherein the mass percentage of carbaryl in the "rice sample" is 0%, 1.0%, 1.5%, 2.0%, 2....
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Abstract
The invention relates to a method for quantitatively detecting pesticide residues in grains by adopting a terahertz frequency band FTIR (Fourier Transform Infrared Spectroscopy) technology. The method comprises the following steps: grinding grain samples to be detected, sheeting the ground grain samples to obtain grain sheet samples to be detected, directly testing the grain sheet samples to be detected by adopting a terahertz frequency band FTIR system to obtain an absorption spectrum at the frequency band of 0-20.4 THz, testing a mixed sheet sample of a target pesticide and polyethylene by adopting the same manner to determine the feature band of the target pesticide, dividing absorption spectrums of the grain sheet samples to be detected and the mixed sheet sample under the feature band into a training set sample absorption spectrum and a validation set sample absorption spectrum randomly, building a quantitative analysis model by using a partial least squares regression method to obtain the quantitative detection values of the grain samples to be detected. The method provided by the invention can really and effectively realize the quick and accurate quantitative detection on pesticide residues in grains, and the average value of the predicted correlation coefficient (Rv) of the quantitative analysis model reaches up to 0.9927.
Description
technical field [0001] The invention relates to a method for quantitatively detecting pesticide residues in grain by using terahertz frequency band FTIR 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 exces...
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IPC IPC(8): G01N21/3563
Inventor 张卓勇孙彤赵彩虹
Owner CAPITAL NORMAL UNIVERSITY