Solid pesticide identification method based on terahertz spectroscopy

A terahertz and terahertz time-domain technology, applied in the field of identifying pesticides, can solve problems such as destruction, ecological environment pollution, and impact on safety, and achieve the effects of simple pre-processing, low energy, and non-destructive testing

Inactive Publication Date: 2014-12-24
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

However, while the extensive use of pesticides plays a positive role, it also causes pollution and damage to the ecological environment. At the same time, pesticide residues in agricultural products and food have increasingly become a social problem that affects human safety.

Method used

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  • Solid pesticide identification method based on terahertz spectroscopy
  • Solid pesticide identification method based on terahertz spectroscopy
  • Solid pesticide identification method based on terahertz spectroscopy

Examples

Experimental program
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Embodiment

[0046] (1) Place hexachlorobenzene, dicofen, imophos, trichlorfon technical and polyethylene powder with a purity greater than 99% in a vacuum drying oven for 2 to 3 hours, and then dry the four Pesticides were mixed with polyethylene powder at a ratio of 1:1, weighed 200 mg, fully ground and mixed evenly in an agate mortar under the irradiation of an infrared lamp, and pressed with a tablet machine under a pressure of 20 MPa into Disc-shaped flakes with a diameter of 13mm and a thickness of 1.0-1.5mm are used to obtain solid pesticide experimental samples;

[0047] (2) In a nitrogen environment with room temperature and relative humidity less than 1%, use the terahertz time-domain spectroscopy system to test the empty sample holder, obtain the THz time-domain waveform data of nitrogen, and use it as a reference signal for data processing, and repeat the measurement for 11 groups ;

[0048] (3) In a nitrogen environment with room temperature and relative humidity less than 1%...

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Abstract

The invention discloses a solid pesticide identification method based on terahertz spectroscopy. The method comprises the following steps: (1) detecting a solid pesticide standard sample with the purity of greater than 99 percent by using a terahertz time-domain spectroscopy system, acquiring a terahertz time-domain signal of each sample, and calculating an absorption spectrum of each sample, wherein the solid pesticides refer to hexachlorobenzene, diphenylsulfon, phosmet and dipterex; (2) normalizing the absorption spectrum of each sample, wherein the influence on noise and drift is eliminated, and the absorption spectrum is used for spectral classification of each sample; and (3) identifying the terahertz absorption spectrum of each sample by utilizing a C-support vector machine (C-SVM). The method disclosed by the invention can realize rapid and nondestructive detection of pesticides and has the advantages of simple pretreatment of experimental samples, simplicity in operation, high repeatability, data processing simplicity, accurate detection result and the like.

Description

technical field [0001] The invention relates to a method for identifying pesticides, in particular to a method for identifying solid pesticides based on terahertz spectroscopy. Background technique [0002] With the development of modern agriculture, pesticides play an irreplaceable role in agricultural production. A large number and variety of pesticides are of great significance for ensuring agricultural production and reducing labor input. However, while the extensive use of pesticides plays a positive role, it also causes pollution and damage to the ecological environment. At the same time, the residue of pesticides in agricultural products and food has increasingly become a social problem that affects human safety. [0003] THz time-domain spectroscopy technology is a new technology of far-infrared spectroscopy emerging in recent years. The sample preparation of the THz time-domain spectroscopy system (THz-TDS) is simple and can avoid the complicated pretreatment proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 黄翼虎马吉祥刘文龙林其安王新龙张银萍李秋阳
Owner QINGDAO UNIV OF SCI & TECH
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