CN112345487B - Method for judging concentration of monomer incense raw material solution based on near infrared spectrum technology - Google Patents
Method for judging concentration of monomer incense raw material solution based on near infrared spectrum technology Download PDFInfo
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- 239000002994 raw material Substances 0.000 title claims abstract description 100
- 239000000178 monomer Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000002329 infrared spectrum Methods 0.000 title claims abstract description 27
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- 239000003205 fragrance Substances 0.000 claims abstract description 71
- 239000002904 solvent Substances 0.000 claims abstract description 54
- 239000002304 perfume Substances 0.000 claims abstract description 21
- 238000001228 spectrum Methods 0.000 claims abstract description 10
- 238000009795 derivation Methods 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 6
- 238000002835 absorbance Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- WRMNZCZEMHIOCP-UHFFFAOYSA-N 2-phenylethanol Chemical compound OCCC1=CC=CC=C1 WRMNZCZEMHIOCP-UHFFFAOYSA-N 0.000 description 42
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 25
- 238000004458 analytical method Methods 0.000 description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 235000013599 spices Nutrition 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004497 NIR spectroscopy Methods 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 244000061176 Nicotiana tabacum Species 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 241000411851 herbal medicine Species 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 235000013616 tea Nutrition 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
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Abstract
A method for judging concentration of a monomer perfume raw material solution based on a near infrared spectrum technology is characterized in that the absorption intensity of a spectrum of a monomer perfume raw material in a near infrared region basically meets the Lambert-beer absorption law, on the basis of collected near infrared spectrums of a solvent used by the monomer perfume raw material to be detected and a monomer perfume raw material to be detected without the solvent, corresponding pretreatment is carried out on the spectrum, and the correlation relation between the monomer perfume raw material to be detected and the solvent used as well as the near infrared spectrum of the monomer perfume raw material to be detected without the solvent in a specified difference wave number (or wavelength) interval is calculated, so that the concentration of the monomer perfume raw material to be detected is quickly judged. The method can simplify the detection process of the concentration of the monomer fragrance raw material, realizes the rapid determination of the concentration of the monomer fragrance raw material solution by utilizing the near infrared spectrum, and is beneficial to improving the working efficiency of a fragrance mixer.
Description
Technical Field
The invention relates to a method for judging the concentration of a monomer perfume raw material solution based on a near infrared spectrum technology, and belongs to the field of essence and perfume detection.
Background
The blending work is to use natural spice and synthetic spice, combine the feeling of art, create the artwork according with the use requirement, in order to meet people's needs and pursuits of beauty in the aspect of fragrance. In order to achieve the purpose, a spice maker can determine the formula only through repeated practices of preparing the formula, blending, modifying, perfuming and the like. The type of solvent used for the monomeric fragrance raw materials has a great influence on the fragrance exhibited by the monomeric fragrance raw materials, which requires that a fragrance engineer be skilled in mastering the fragrance characteristics exhibited by different fragrance raw materials under different solvent systems.
The near infrared spectrum technology has the characteristics of concise, rapid and pollution-free analysis process, and qualitative analysis of the near infrared spectrum technology has the characteristics of integrity and fuzziness, and is widely applied to variety identification and production process quality control of agriculture, forestry, papermaking, tobacco, tea, food, petrifaction and Chinese herbal medicines at present. Near-infrared light, which is between visible light and mid-infrared light, can generally divide the electromagnetic wave in this region into two regions, namely near-infrared long wave (1100-. Defined by the American society for testing and Material testing (ASTM) as electromagnetic waves having a wavelength within the range of 780-2526 nm. Because different organic matters contain different groups and the different groups have different energy levels, the different groups and the same group have obvious difference on the absorption wavelength of near infrared light in different physical and chemical environments. Near-infrared light is mainly the frequency-doubled and frequency-combined absorption of the vibrations of hydrogen-containing groups X-H (X ═ C, N, O), which contains information on the composition and molecular structure of most types of organic compounds. In addition, the near infrared light has small absorption coefficient and less heat generation, so the near infrared spectrum can be used as an effective carrier for acquiring information.
The NIR spectroscopy technique has the following advantages: (1) the analysis speed is high, and most of the measurement process can be finished within 1 min; (2) the analysis efficiency is high, and a plurality of components or properties of the sample can be simultaneously determined through one-time spectral measurement and the established corresponding correction model, so that qualitative and quantitative results are provided; (3) the applicable sample range is wide, samples in different states such as liquid, solid, semisolid and gel can be directly measured, and the spectral measurement is convenient; (4) the sample is not damaged, no pollution is generated after analysis, and the analysis cost is low; (5) the test reproducibility is good; (6) NIR has good transmission characteristics in ordinary optical fibers and is suitable for on-line analysis.
Chinese patent (CN109668858A) discloses a method for detecting biomass and component concentration in a fermentation process based on near infrared spectrum, which comprises the steps of collecting spectral data and reference data, preprocessing the measured near infrared spectrum data, establishing a combined calibration model for a data division correction set and a verification set, selecting model parameters by using a grid search and cross verification method, and finally verifying the effectiveness of the established model through an external experiment so as to quantitatively analyze the biomass, substrate concentration and product concentration in the fermentation process. The method needs a modeling process, so that the concentration can be accurately predicted only by a large data volume, and the modeling is long in time consumption. Therefore, the invention aims to simplify the detection process of the concentration of the monomer fragrance raw material and achieve the aim of quickly judging the concentration of the monomer fragrance raw material solution by utilizing the near infrared spectrum.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for judging the concentration of a monomer fragrance raw material solution based on a near infrared spectrum technology, which can simplify the detection process of the concentration of the monomer fragrance raw material and realize the quick judgment of the concentration of the monomer fragrance raw material solution by using the near infrared spectrum.
In order to achieve the technical purpose, the invention provides a method for judging the concentration of a monomer fragrance raw material solution based on a near infrared spectrum technology, which comprises the following steps:
(1) respectively collecting a monomer fragrance raw material solution to be detected, a solvent used by the monomer fragrance raw material to be detected and a near-infrared spectrogram of the monomer fragrance raw material to be detected without the solvent;
(2) preprocessing a near-infrared spectrogram: respectively carrying out order derivation on the absorbance (or transmittance) of the near-infrared spectrogram of the solvent used by the monomer fragrance raw material to be detected, the monomer fragrance raw material to be detected without the solvent and the monomer fragrance raw material solution to be detected on the wave number (or wavelength) to respectively obtain new spectrogram curves of the solvent used by the monomer fragrance raw material to be detected, the monomer fragrance raw material to be detected without the solvent and the monomer fragrance raw material solution to be detected, which take dimensionless derivative values as vertical coordinates and the wave number (or wavelength) as horizontal coordinates;
(3) acquiring a solvent used by a monomer fragrance raw material to be detected, a monomer fragrance raw material to be detected without the solvent and a significant difference interval of a new spectrogram curve of a monomer fragrance raw material solution to be detected, wherein the significant difference interval is a wave number interval or a wavelength interval with significant fluctuation change of dimensionless values selected according to a new spectrogram;
(4) calculating the concentration of the monomer perfume raw material to be detected: calculating the concentration of the monomer incense raw material to be detected based on the longitudinal coordinate values of the solvent used by the monomer incense raw material to be detected, the monomer incense raw material to be detected without the solvent and the new spectrogram curve of the monomer incense raw material solution to be detected under all wave numbers (or wavelengths) in the significant difference interval, wherein the calculation mode is shown as formula I:
wherein C is the concentration of the monomer incense raw material solution, i is all wave numbers or wavelength values in all significant difference intervals, and XiThe solvent used by the monomer perfume raw material to be detected corresponds to the ordinate value, Y, of the new spectrogram curve when the wave number or the wavelength value is iiThe single perfume raw material to be measured without solvent corresponds to the ordinate value, Z of the new spectrogram curve when the wave number or the wavelength value is iiThe method is characterized in that when the wave number or the wavelength value of the monomer perfume raw material solution to be detected is i, the monomer perfume raw material solution corresponds to the ordinate value of a new spectrogram curve, n is the total number of all wave numbers or wavelength values in all significant difference intervals, and if X exists in the significant difference intervalsi＝YiThen the corresponding data is culled.
Preferably, in the step (1), before the near-infrared spectrogram of the monomer fragrance raw material solution to be detected, the solvent used by the monomer fragrance raw material to be detected and the monomer fragrance raw material to be detected without the solvent is collected, parameters of a near-infrared spectrometer, such as conventional parameters of optical distance, spectral range, scanning speed, scanning frequency, resolution and the like of a cuvette, are set, after the parameters are set, the empty cuvette is placed in a sample tank to collect a background spectrum, and then a liquid-moving gun is used for moving a sample to be detected into the cuvette to collect the near-infrared spectrogram of the sample; the solvent is a solvent of the type commonly used for perfume raw materials, such as water, ethanol, propylene glycol, glycerol, and the like.
More preferably, in step (1), the parameters of the near-infrared spectrometer are set as follows: spectral range of [12800cm-1，3600cm-1]Or [780nm, 2778nm ]](ii) a The scanning speed ranges from 1/s to 64/s]The number of scanning times is in the range of [1, 128 ]]Resolution range of [2cm-1，64cm-1](ii) a The optical path of the cuvette is 1mm and 10mm]。
Preferably, in the step (2), when the order derivation is performed on each near-infrared spectrogram to obtain a new spectrogram curve, the order range is [1, 3 ].
Preferably, in the step (3), the method for judging the wavenumber region or wavelength region with significant fluctuation change comprises the following steps: in an interval, the minimum absolute value of the difference value of the longitudinal coordinates of the solvent used by the monomer fragrance raw material to be detected and the monomer fragrance raw material to be detected without the solvent under a certain wave number or wavelength value is taken to judge whether the minimum absolute value exceeds a preset threshold value, and if the minimum absolute value exceeds the threshold value, the interval is selected as a significant difference interval; the setting method of the preset threshold value comprises the following steps: multiplying the maximum absolute value of the difference value of the longitudinal coordinates of the solvent used by the monomer fragrance raw material to be detected and the monomer fragrance raw material to be detected without the solvent in the full spectrum range by a threshold coefficient under a certain wave number or wavelength value to obtain a preset threshold, wherein the value range of the threshold coefficient is [0.0001, 0.01], preferably [0.0003, 0.003 ].
The invention mechanism and the beneficial effect of the invention are as follows:
based on that the absorption intensity of the monomer fragrance raw material in the near-infrared region spectrum basically meets the Lambert-beer absorption law, on the basis of the collected near-infrared spectrums of the solvent and the solvent-free monomer fragrance raw material to be detected, the spectrum is correspondingly preprocessed, and the correlation relation between the near-infrared spectrums of the monomer fragrance raw material to be detected, the solvent and the solvent-free monomer fragrance raw material to be detected in a specified difference wave number (or wavelength) interval is calculated, so that the concentration of the monomer fragrance raw material to be detected is quickly judged. The method for rapidly judging the concentration of the monomer fragrance raw material can simplify the detection process of the concentration of the monomer fragrance raw material, realizes rapid judgment of the concentration of the monomer fragrance raw material solution by utilizing the near infrared spectrum, and is beneficial to improving the working efficiency of a fragrance mixer.
Drawings
FIG. 1 is a near infrared spectrum of ethanol, solvent-free phenethyl alcohol and a phenethyl alcohol solution to be measured.
FIG. 2 is a new spectrogram curve of ethanol, solvent-free phenethyl alcohol and to-be-tested phenethyl alcohol solution obtained after first-order derivation.
Detailed Description
The operation and principle of the present invention will be further described with reference to the accompanying drawings, and the following examples are intended to further illustrate the present invention without limiting the present invention, wherein the monomer fragrance raw material solution to be measured collected in the examples of the present invention is a phenylethanol solution (actual concentration is 50%) diluted with ethanol as a solvent.
(1) And setting parameters of the near-infrared spectrometer. Setting the spectrum scanning range of the near-infrared spectrometer to be 9000-4000 cm-1The scanning speed is 4 times/second, the scanning times are 16 times, and the resolution is 8cm-1The optical path of the cuvette used was 2 mm. In this example, the near-infrared spectrogram has absorbance as the ordinate and wave number as the abscissa;
(2) collecting a monomer incense raw material solution to be detected, a solvent used by the monomer incense raw material to be detected and a near-infrared spectrogram of the monomer incense raw material to be detected without the solvent. The monomer fragrance raw material solution to be detected collected in the embodiment is a phenethyl alcohol solution (actual concentration is 50%) diluted by using ethanol as a solvent; after setting parameters of the near-infrared spectrometer in the step (1), placing an empty cuvette in a sample tank to collect a background spectrum, and then respectively transferring a proper amount of ethanol, phenethyl alcohol without a solvent and a phenethyl alcohol solution to be detected into the cuvette by using a liquid transfer gun to collect a near-infrared spectrum (as shown in figure 1);
(3) and (5) preprocessing a near-infrared spectrogram. Respectively carrying out first-order derivation on the absorbance of the near-infrared spectrograms of the ethanol, the phenethyl alcohol without the solvent and the phenethyl alcohol solution to be detected on wave numbers to respectively obtain new spectrogram curves (as shown in figure 2) of the ethanol, the phenethyl alcohol without the solvent and the phenethyl alcohol solution to be detected by taking a dimensionless derivative value as a vertical coordinate and taking the wave number as a horizontal coordinate;
(4) acquiring a significant difference interval of new spectrogram curves of ethanol, phenethyl alcohol without solvent and a phenethyl alcohol solution to be detected;
in the examples of the present invention, ethanol and solvent-free phenethyl alcohol were used at a wave number of 4424cm-1The absolute value of the difference between the two vertical coordinates is determined to be the maximum value 0.05838, and the preset threshold is 0.00005838 if the coefficient is set to be 0.001 in the present embodiment. Analyzing and calculating new spectrogram curves of the ethanol, the phenethyl alcohol without the solvent and the phenethyl alcohol solution to be detected in the graph 2, wherein the spectrograms are 7463-6826 cm-1、6321～5646cm-15033-4000 cm-1There are significant differences between these three intervals, and therefore, the three intervals are selected as significant difference intervals.
(5) And calculating the concentration of the monomer perfume raw material to be detected.
The corresponding ordinate (X) of new spectrogram curves of ethanol, phenethyl alcohol without solvent and phenethyl alcohol solution to be detected at all wave numbers in the significant difference rangei，Yi，Zi) And the concentration value of the phenethyl alcohol solution to be measured calculated according to the formula (1) is shown in the following table 1 (wherein, the wave number is 7162.39cm-1And 7116.10cm-1Position Xi＝YiTherefore, the two data are removed), the finally obtained concentration value is 49.82%, the actual concentration of the to-be-measured phenethyl alcohol solution is 50.00%, and the relative error between the concentration value obtained by the method and the actual concentration is 0.36%, so that the requirement for judging the concentration of the monomer fragrance raw material can be well met.
TABLE 1
Claims (5)
1. A method for judging the concentration of a monomer fragrance raw material solution based on a near infrared spectrum technology is characterized by comprising the following steps:
(1) respectively collecting a monomer fragrance raw material solution to be detected, a solvent used by the monomer fragrance raw material to be detected and a near-infrared spectrogram of the monomer fragrance raw material to be detected without the solvent;
(2) preprocessing a near-infrared spectrogram: respectively carrying out order derivation on any one of absorbance and transmittance of near-infrared spectrograms of a solvent used by the monomer fragrance raw material to be detected, the monomer fragrance raw material to be detected without the solvent and a monomer fragrance raw material solution to be detected to obtain new spectrogram curves of the solvent used by the monomer fragrance raw material to be detected, the monomer fragrance raw material to be detected without the solvent and the monomer fragrance raw material solution to be detected, which take dimensionless derivative values as ordinate and wave number or wavelength as abscissa;
(3) acquiring a solvent used by a monomer fragrance raw material to be detected, a monomer fragrance raw material to be detected without the solvent and a significant difference interval of a new spectrogram curve of a monomer fragrance raw material solution to be detected, wherein the significant difference interval is a wave number interval or a wavelength interval with significant fluctuation change of dimensionless values selected according to a new spectrogram;
(4) calculating the concentration of the monomer perfume raw material to be detected: calculating the concentration of the monomer incense raw material to be detected based on the longitudinal coordinate values of the solvent used by the monomer incense raw material to be detected, the monomer incense raw material to be detected without the solvent and the new spectrogram curve of the monomer incense raw material solution to be detected under all wave numbers or wavelengths in the significant difference interval, wherein the calculation mode is shown as formula I:
Wherein C is the concentration of the monomer incense raw material solution, and i is in all the significant difference intervalsAll wave number or wavelength value of, XiThe solvent used by the monomer perfume raw material to be detected corresponds to the ordinate value, Y, of the new spectrogram curve when the wave number or the wavelength value is iiThe single perfume raw material to be measured without solvent corresponds to the ordinate value, Z of the new spectrogram curve when the wave number or the wavelength value is iiThe method is characterized in that when the wave number or the wavelength value of the monomer perfume raw material solution to be detected is i, the monomer perfume raw material solution corresponds to the ordinate value of a new spectrogram curve, n is the total number of all wave numbers or wavelength values in all significant difference intervals, and if X exists in the significant difference intervalsi=YiThen the corresponding data is removed;
in the step (3), the method for judging the wavenumber region or wavelength region with significant fluctuation change comprises the following steps: in an interval, the minimum absolute value of the difference value of the longitudinal coordinates of the solvent used by the monomer fragrance raw material to be detected and the monomer fragrance raw material to be detected without the solvent under a certain wave number or wavelength value is taken to judge whether the minimum absolute value exceeds a preset threshold value, and if the minimum absolute value exceeds the threshold value, the interval is selected as a significant difference interval; the setting method of the preset threshold value comprises the following steps: and multiplying the maximum absolute value of the difference value of the longitudinal coordinates of the solvent used by the monomer fragrance raw material to be detected and the solvent-free monomer fragrance raw material to be detected within the acquired full spectrum range under a certain wave number or wavelength value by a threshold coefficient to obtain a preset threshold, wherein the value range of the threshold coefficient is [0.0001, 0.01 ].
2. The method for determining the concentration of a monomer fragrance raw material solution based on the near infrared spectrum technology as claimed in claim 1, wherein: in the step (1), before the near-infrared spectrogram of the monomer fragrance raw material solution to be detected, the solvent used by the monomer fragrance raw material to be detected and the solvent-free monomer fragrance raw material to be detected is acquired, the parameters of a near-infrared spectrometer are set, after the parameters are set, an empty cuvette is placed in a sample groove to acquire a background spectrum, and then a liquid transfer gun is used for transferring the sample to be detected into the cuvette and acquiring the near-infrared spectrum of the sample.
3. The method for determining the concentration of the monomer fragrance raw material solution based on the near infrared spectrum technology as claimed in claim 2, wherein: in the step (1), the step (c),the parameters of the near-infrared spectrometer are set as follows: spectral range of [12800cm-1，3600 cm-1]Or [780nm, 2778nm ]](ii) a The scanning speed ranges from 1/s to 64/s]The number of scanning times is in the range of [1, 128 ]]Resolution range of [2cm-1，64cm-1](ii) a The optical path of the cuvette is 1mm and 10mm]。
4. The method for determining the concentration of a monomer fragrance raw material solution based on the near infrared spectrum technology as claimed in claim 1, wherein: in the step (2), when the order derivation is performed on each near-infrared spectrogram to obtain a new spectrogram curve, the order range is [1, 3 ].
5. The method for determining the concentration of a monomer fragrance raw material solution based on the near infrared spectrum technology as claimed in claim 1, wherein: the value range of the threshold coefficient is [0.0003, 0.003 ].
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