Method for determining optical parameters of solid bactericide pesticide

A technology of optical parameters and measurement methods, which is applied in the measurement of color/spectral characteristics, the measurement of phase influence characteristics, and the preparation of samples for testing. Simple pre-processing, non-destructive testing, and easy-to-operate effects

Inactive Publication Date: 2011-10-05
CHINA JILIANG UNIV
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Problems solved by technology

However, the sample pretreatment of this method is complicated, the detection time is long,

Method used

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  • Method for determining optical parameters of solid bactericide pesticide
  • Method for determining optical parameters of solid bactericide pesticide
  • Method for determining optical parameters of solid bactericide pesticide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Put the standard analysis sample of benomyl and polyethylene powder in a vacuum drying oven for 2 hours, grind and mix the fungicide pesticide benomyl sample and polyethylene at a mass percentage of 50%, and press it with air pressure Under the pressure of 30 MPa, the tablet machine presses it into a disk-shaped sheet with a diameter of 10-13 mm and a thickness of 1.2-1.5 mm to obtain the experimental sample of benomyl;

[0039]2) Use the terahertz time-domain spectroscopy system to test the nitrogen without the test sample, obtain the THz time-domain data of nitrogen, repeat the measurement 5 times, take the average value, and use it as a reference signal for data processing;

[0040] 3) Use the terahertz time-domain spectroscopy system to test the benomyl experimental sample, obtain the THz time-domain data of the sample, repeat the measurement 5 times, take the average value, and use it as the signal of the benomyl experimental sample for data processing;

[0041]...

Embodiment 2

[0048] 1) Dry the chlorothalonil experimental sample with a purity of 98.0% and polyethylene in a vacuum drying oven for 2 hours, grind and mix the thiophanate-methyl experimental sample and polyethylene at a mass percentage of 50%, and then use air pressure The tablet press presses it into a disk-shaped sheet with a diameter of 10-13 mm and a thickness of 1.2-1.5 mm under a pressure of 30 MPa to obtain a chlorothalonil experimental sample;

[0049] 2) Use the terahertz time-domain spectroscopy system to test the nitrogen without the test sample, obtain the THz time-domain data of nitrogen, repeat the measurement 5 times, take the average value, and use it as a reference signal for data processing;

[0050] 3) Use the terahertz time-domain spectroscopy system to test the chlorothalonil experimental sample, obtain the sample THz time-domain data, repeat the measurement 5 times, take the average value, and use it as the signal of the chlorothalonil experimental sample for data pr...

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Abstract

The invention discloses a method for determining the optical parameters of solid bactericide pesticide. Nitrogen and the sample of the solid bactericide pesticide are respectively tested by a transmission-type terahertz time-domain spectra (THz-TDS) to obtain THz time domain data of the nitrogen and the sample of the bactericide pesticide, and the data is processed to obtain, within a frequency band from 0.1THz to 2.2THz, the data of the optical parameters (a refractive index spectrum and a characteristic absorption spectrum) of the sample of the bactericide pesticide within THz waveband. Two bactericides are benomyl and chlorothalonil. The method can realize rapid, simple, convenient and non-destructive testing of the solid bactericide pesticide, and the sample in the method has the advantages of being simple in pretreatment, easy in operation, simple in data processing, high in reliability of testing results and the like. The data of the optical parameters of the 2 solid bactericide pesticides within THz waveband are obtained by the method disclosed by the invention, and the method is of great importance for identifying the type of bactericide pesticides on agricultural products by utilizing terahertz time-domain technology and establishing a standard THz spectrum database.

Description

technical field [0001] The invention relates to a method for detecting and identifying pesticide types by using terahertz time-domain spectroscopy technology, in particular to a method for measuring optical parameters of fungicide solid pesticides. Background technique [0002] With the rapid development of modern agriculture, the demand and dependence of agriculture on pesticides are increasing. Pesticides have also brought great impact and harm to the environment and people's health. Especially in recent years, more and more attention has been paid to the teratogenic disability and poisoning incidents caused by excessive pesticide residues in food. Trace residues of pesticides and their metabolites are found in soil, water and agricultural products. All countries in the world have corresponding detection methods and standards for maximum pesticide residues in agricultural products and food. At present, my country is also formulating national standards for maximum pestici...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/41G01N1/28
Inventor 王强王孝伟马冶浩王花丽
Owner CHINA JILIANG UNIV
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