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
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  • 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 not only time-consuming, but also introduces many assumptions, only for pure substances (Approximate standard product) has a good spectrum reduction effect, but has poor reduction accuracy for samples with actual matrix interference, and is difficult to apply to the accurate determination of complex matrix samples

Method used

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  • 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

Embodiment 1

[0025] Embodiment 1. Establish the Raman spectral library of pesticide standard products, specifically as follows.

[0026] Portable dual light source Raman spectrometer uses 785nm light source, 1nm spacing, 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 standard products (>99%) and conduct direct detection on samples. Through the difference algorithm software integrated into the Raman spectrometer, the two Raman spectrum characteristic parameters of the pesticide standard obtained by detection are subjected to difference and signal filtering to eliminate the interference of fluorescence and ambient light, and obtain the Raman spectrum of the pesticide standard Difference spectrogram data. By detecting a variety of pesticide standard substances, a Raman spectral database of pesticides was established.

Embodiment 2

[0028] Example 2. The detection of the commercially available pesticide Raman spectrum is as follows.

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

[0030] Portable dual light source Raman spectrometer uses 785nm light source, 1nm spacing, 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 commercially available pesticide diquat

[0032] The dosage form of brand A diquat pesticide is water agent, the product marked content is 200g / L, and the packaging is translucent white plastic bottle; the dosage form of brand B diquat pesticide is water agent, the product marked content is 200g / L, and the packaging is transparent plastic bottle.

[0033] The laser probe directly detects brand A and brand B pesticides through the plastic bottle, and through the differential algorithm software i...

Embodiment 3

[0042] Example 3. Verify the detection limit of the detection method, specifically as follows.

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

[0044] Samples of each concentration were filled into glass vials for direct detection. By the same method as the diquat pesticide in Example 2, the Raman spectrum differential spectrum data of samples with various concentrations were obtained.

[0045] The results showed that with the decrease of the effective components of diquat, the intensity of characteristic peaks of diquat gradually weakened, the number of characteristic peaks decreased, and the matching ratio decreased. The matching ratios of 10%, 5%, 1%, 0.2%, and 0.05% samples were 58%, 50%, 42%, 42%, and 17%, respectively. It can be seen that the detection limit of the commercially available pesticide diquat is 0.2%, w...

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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

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Application Information

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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
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