Method for rapidly identifying true and false pesticides based on portable differential Raman technology

A portable and pesticide-based technology, applied in Raman scattering, material excitation analysis, etc., can solve problems such as accurate measurement of difficult and complex matrix samples, inability to form mature products, poor accuracy of sample reduction, etc., to achieve automatic screening and detection limit The effect of low and high accuracy

Active Publication Date: 2020-01-31
南京简智仪器设备有限公司
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, since the differential Raman method was proposed in the 1990s, this technology has not been able to form mature products, especially miniaturized and portable products.
[0006] At present, there is a method to restore the differential spectrum by using the deconvolution algorithm, but this algorithm is n

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for rapidly identifying true and false pesticides based on portable differential Raman technology
  • Method for rapidly identifying true and false pesticides based on portable differential Raman technology
  • Method for rapidly identifying true and false pesticides based on portable differential Raman technology

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1. Establish a library of Raman spectra of pesticide standards, as follows.

[0026] Portable dual-light source Raman spectrometer light source adopts 785nm, spacing 1nm, single frequency output power 400mw, line width 0.06nm, spectral range: 180-2800cm -1 , The Raman spectrum scan time of the collected sample is 5 seconds.

[0027] Purchase common pesticide standards (>99%), and directly test the samples. Through the differential algorithm software integrated into the Raman spectrometer, the two Raman spectral characteristic parameters of the pesticide standard product obtained from the detection are subjected to differential and signal filtering to eliminate the interference of fluorescence, ambient light, etc., to obtain the pesticide standard Raman spectrum Differential spectrum data. Establish a database of Raman spectra of pesticides by testing multiple pesticide standards.

Example Embodiment

[0028] Example 2. The Raman spectroscopy detection of commercially available pesticides is specifically as follows.

[0029] All the commercially available pesticides used in the experiment were purchased from e-commerce platforms.

[0030] Portable dual-light source Raman spectrometer light source adopts 785nm, spacing 1nm, single frequency output power 400mw, line width 0.06nm, spectral range: 180-2800cm -1 , The Raman spectrum scan time of the collected sample is 10 seconds.

[0031] (1) Determination of the commercially available pesticide diquat

[0032] A brand diquat pesticide formulation is a water formulation, the product labeled content is 200g / L, and the packaging is a translucent white plastic bottle; brand B diquat pesticide formulation is a water formulation, the product labeled content is 200g / L, and the packaging is transparent plastic bottle.

[0033] The laser probe directly detects the pesticides of brand A and brand B through the plastic bottle. Through the differen...

Example Embodiment

[0042] Example 3. To verify the detection limit of the detection method, the details are as follows.

[0043] Diquat brand B pesticide (200g / L, content about 20%) in Example 2 was diluted with purified water, and diluted into a sample of 10%, 5%, 1%, 0.2%, 0.05% of the active ingredient of Diquat .

[0044] Load samples of various concentrations into glass sample bottles for direct detection. The Raman spectroscopy data of each concentration sample was obtained by the same method as the diquat pesticide in Example 2.

[0045] The results showed that as the effective components of diquat decreased, the characteristic peak intensity of diquat gradually weakened, the number of characteristic peaks decreased, and the matching ratio decreased. The sample matching ratios of 10%, 5%, 1%, 0.2%, and 0.05% are 58%, 50%, 42%, 42%, and 17%, respectively. It can be seen that the detection limit of the commercially available pesticide Diquat is 0.2%, which meets the testing requirements of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for rapidly identifying true and false pesticides based on portable differential Raman technology. The method adopts a portable differential Raman system, uses two wavelength light sources to detect samples, and comprises the following steps of firstly collecting two pieces of Raman spectrogram data of commercially available pesticides detected by a double-light source Raman spectrometer with stable and tiny wavelength difference, differentiating the two Raman spectra, and performing special algorithm filtering on Raman characteristic signals generated by thedifferentiation to separate the differential signals from baseline deviation, thereby obtaining the differential characteristics of the pesticide samples with eliminated interference of fluorescence and the like; and finally comparing the differential characteristics with the spectrogram characteristic peaks of pesticide standard samples to realize the identification of true and false of commercially available pesticide components. By adopting the double-light source excited differential technology, the sample background interference is eliminated, and more detailed Raman characteristics of the sample are accurately extracted by performing characteristic filtering realization on the differential spectrogram; and a characteristic database and classification identification of the commercially available pesticides are established for the differential Raman characteristics. By using the differential technology, the accuracy and the sensitivity of the detection are greatly improved, the portable Raman system for the detection on the commercially available pesticides is realized, and the detection can be completed without any pretreatment process; and the method is simple in operation, fast in detection speed, high in accuracy and has significance for the pesticide quality safety control.

Description

technical field [0001] The invention belongs to the field of analysis and detection of substances, in particular to the technical field of rapid detection of product quality and safety. Background technique [0002] In recent years, with the rapid development of social economy, people have higher and higher requirements for agricultural products. In order to improve the output value of agricultural products, highly toxic pesticides are often used in agricultural production. However, pesticides themselves are very toxic, so the use of pesticides will not only bring harm to the soil, but also bury safety hazards to human health. In order to reduce the hazards of highly toxic pesticides, the Chinese government has intensified the management of the use of highly toxic pesticides. The government has banned the use of some pesticides, but some manufacturers will add highly toxic pesticides that are not marked on the label or Doping with "hidden" ingredients, according to the curr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 夏婧竹刘峰于爽张苗苗
Owner 南京简智仪器设备有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap