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Nondestructive testing method for absorption coefficient and refractive index of pesticide

An absorption coefficient and non-destructive testing technology, which is applied in the measurement of phase influence characteristics, the preparation of test samples, and the measurement of color/spectral characteristics. Good repeatability, non-destructive testing, and accurate test results

Inactive Publication Date: 2011-07-06
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sample preparation of such methods is complex and time-consuming, and it is difficult to achieve intuitive detection of pesticides

Method used

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  • Nondestructive testing method for absorption coefficient and refractive index of pesticide
  • Nondestructive testing method for absorption coefficient and refractive index of pesticide
  • Nondestructive testing method for absorption coefficient and refractive index of pesticide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Put the analytical-grade chlorpyrifos-methyl sample and polyethylene in a vacuum drying oven for 2 hours, take 50% chlorpyrifos-methyl sample and polyethylene, mix them evenly, grind them, and use a tablet machine at 30 Under the pressure of MPa, it is compressed into a disc-shaped sheet with a diameter of 13 mm to obtain a test sample of chlorpyrifos-methyl;

[0041] 2) Use the terahertz time-domain spectroscopy system to test nitrogen gas, and obtain the terahertz wave time-domain waveform of nitrogen gas, as a reference signal, repeat three times, and take the average value;

[0042] 3) Use the terahertz time-domain spectroscopy system to test the chlorpyrifos-methyl test sample, and obtain the time-domain waveform of the terahertz wave as the sample signal of chlorpyrifos-methyl, repeat three times, and take the average value;

[0043] 4) Fourier transform is performed on the average value of the reference signal and the average value of the chlorpyrifos-methyl tes...

Embodiment 2

[0049] 1) Put the propoxur sample and polyethylene with a mass percentage of 98% respectively in a vacuum drying oven for 2 hours to dry, take a 50% mass percentage of an insecticide and pesticide sample and polyethylene, mix them evenly, grind them, and use a tablet Pressing machine under the pressure of 30 MPa into a disk-shaped sheet with a diameter of 13 mm to obtain the test sample of propoxur;

[0050] 2) Use the terahertz time-domain spectroscopy system to test nitrogen gas, and obtain the terahertz wave time-domain waveform of nitrogen gas, as a reference signal, repeat three times, and take the average value;

[0051] 3) Use the terahertz time-domain spectroscopy system to test the propoxur test sample, obtain the time-domain waveform of the terahertz wave, and use it as the sample signal of propoxur, repeat three times, and take the average value;

[0052] 4) Perform Fourier transform on the average value of the reference signal and the average value of the propoxur ...

Embodiment 3

[0059] 1) Put the fenvalerate sample with a mass percentage of 98% in a vacuum drying oven for 3 hours, grind the fenvalerate sample, and press it into a tablet with a diameter of 12 mm under a pressure of 20 MPa. Disc-shaped thin slice, obtains the test sample of fenvalerate;

[0060] 2) Use the terahertz time-domain spectroscopy system to test nitrogen, and obtain the time-domain waveform of the terahertz wave of nitrogen, as a reference signal, repeat three times, and take the average value;

[0061] 3) Use the terahertz time-domain spectroscopy system to test the test sample of fenvalerate, and obtain the time-domain waveform of its terahertz wave, as the signal of the fenvalerate test sample, repeat three times, and take the average value;

[0062] 4) Perform Fourier transform on the average value of the reference signal and the average value of the fenvalerate test sample signal to obtain the terahertz frequency domain map of the reference signal and the terahertz freque...

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Abstract

The invention discloses a nondestructive testing method for absorption coefficient and refractive index of a pesticide. The method comprises the following steps of: testing nitrogen and a pesticide test sample by using a transmission-type terahertz time domain spectroscopy (THz-TDS) to obtain time domain spectrums of the nitrogen and the pesticide test sample respectively; and performing data processing to obtain refractive index spectrum and absorption spectrum of the pesticide test sample at the THz wave band of between 0 and 2.5THz, wherein the pesticide comprises chlorpyriphos methyl, baygon and fenvalerate. By the method, rapid nondestructive testing of the pesticide can be realized; and the method has the advantages of simple sample preprocessing, easiness of operation, high repeatability, simple data processing, relatively accurate testing result and the like. The method has great significance to detection of pesticide residue on fruits and vegetables by using the terahertz time domain technology based on fingerprint spectrums of the three pesticides obtained by the method.

Description

technical field [0001] The invention relates to a pesticide detection method using terahertz time-domain spectroscopy technology, in particular to a non-destructive detection method for the absorption coefficient and refractive index of pesticides and pesticides. Background technique [0002] Chlorpyrifos methyl, the English trade name is Chlorpyriphos methyl, it is a broad-spectrum organophosphate insecticide. Molecular formula C 7 h 7 Cl 3 NO 3 PS, molecular weight 322.53, melting point 45.5 ℃, the original drug is white crystalline powder. It is used to control pests in stored grains and various leaf crops, and can also control mosquito adults, flies, aquatic larvae, etc. Promox, English product name Baygon, molecular formula C 11 h 15 NO 3 , molecular weight 209.13, the original drug is a white crystalline powder, soluble in most organic solvents. Can kill external parasites, mosquitoes, flies, cockroaches and other pests and storage pests. Fenvalerate, English...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/41G01N1/28
Inventor 王强王花丽王孝伟
Owner CHINA JILIANG UNIV
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