Method for qualitatively detecting matter and quantitatively detecting components of matter on basis of Raman spectrometer
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A Raman spectrometer and qualitative detection technology, applied in Raman scattering, material excitation analysis, etc., which can solve the problems of deviation of test results and unstable reception of scattered light.
Inactive Publication Date: 2016-01-06
SHANGHAI WEIHUA SCI INSTR CO LTD
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However, the disadvantage of this method is that it can only analyze pure substances; moreover, it is easy to cause deviations in the test results due to the unstable reception of scattered light
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Embodiment 1
[0032] In Example 1, a Raman spectrometer is used to perform qualitative analysis on the substance.
[0033] Two kinds of olive oil were selected for qualitative analysis, one of which was used as a known substance and the other was tested as an unknown substance.
[0034] The qualitative detection steps of olive oil with Raman spectrometer are as follows:
[0035] 1) Measure the laser Raman spectrum of olive oil as a known sample with a Raman spectrometer to obtain its standard spectrogram, such as figure 1 The upper curve in .
[0036] 2) From the standard spectrogram of olive oil as a known sample, find two unique characteristic peaks and their corresponding wavenumbers representing the known sample, and the corresponding wavenumbers of the unique two characteristic peaks taken here are respectively 1304 and 1266. Olive oil is composed of a variety of fatty acids and other components, some of which are the same as those in other oils, and some are unique to olive oil. Th...
Embodiment 2
[0045] In the second embodiment, a Raman spectrometer is used for quantitative analysis of the material components.
[0046] Seven groups of starch powder and soda ash powder were mixed in different proportions for quantitative analysis. The mixing ratio of six groups of mixtures is known, which are 0:100, 20:100, 40:100, 60:100, 80:100 and 100:0; the mixing ratio of another group of mixtures is unknown and needs to be tested .
[0047] The quantitative detection steps of the mixture composed of starch powder and soda ash powder with Raman spectrometer are as follows:
[0048] 1) Use a Raman spectrometer to measure six groups of known mixtures mixed in known ratios to obtain standard spectra for each group.
[0049] 2) From the standard spectrograms of each group of known mixtures, find the unique two characteristic peaks and their corresponding wavenumbers representing each group of known mixtures. The wavenumbers corresponding to the unique two characteristic peaks taken h...
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Abstract
The invention relates to a method for qualitatively detecting matter and quantitatively detecting components of the matter on the basis of a Raman spectrometer, and belongs to the field of matter detection. According to the method for qualitatively detecting the matter on the basis of the Raman spectrometer, a known sample is measured through the Raman spectrometer so that a standard spectrogram of the known sample can be obtained, two characteristic peaks are found in the standard spectrogram, energy values corresponding to the two characteristic peaks are divided to obtain a proportion value, and after the threshold of the proportion value is set, the threshold serves as the reference for qualitative judgment of an unknown sample. According to the method for quantitatively detecting the components of the matter on the basis of the Raman spectrometer, by testing multiple sets of mixtures in the known proportion, a standard curve is obtained according to the proportion value of two known samples in each set of known mixtures and the proportion value of the two corresponding characteristic peaks to serve as a basis for quantitative analysis of unknown mixtures. By means of the methods, deviations caused by unstable receiving of scattered light in the testing process of the Raman spectrometer can be eliminated, and the methods can be used for qualitative detection and analysis of mixtures and quantitative detection and analysis of the components of the mixtures.
Description
technical field [0001] The invention relates to a method for detecting substances by using a laser Raman spectrometer, in particular to a method for qualitatively detecting substances and quantitatively detecting components thereof based on a Raman spectrometer. Background technique [0002] In recent years, due to the rapid and non-destructive testing form of laser Raman, it is getting better and better in various industries. In particular, portable laser Raman spectrometers are generally recognized by users due to their small size and easy portability. [0003] The current portable laser Raman spectrometer mainly uses a method of pre-establishing a spectral library with a certain scale, and then compares and searches the spectral library with the spectra obtained from field tests for qualitative analysis. However, the disadvantage of this method is that only pure substances can be analyzed; moreover, it is easy to cause deviations in test results due to unstable reception...
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