Method for simultaneously and rapidly determining content of two-component triazine ultraviolet light absorber in multiple solvents

Abstract

The invention relates to the technical field of analytical chemistry, in particular to a method for simultaneously and rapidly measuring the content of a two-component triazine ultraviolet light absorber in multiple solvents, which comprises the following steps: S1, preparation of a standard solution, S2, drawing of an ultraviolet absorption spectrum, S3, selection of an optimal wavelength, S4, drawing of a standard curve, and S5, determination of the content of the two-component triazine ultraviolet light absorber. The method comprises the following steps: (1) preparing different concentrations of standard solutions containing the two-component triazine ultraviolet light absorber, and drawing a standard curve according to the first derivative value of the absorbance at the selected optimal wavelength, and (2) determining the content of a sample, namely determining the mixed triazine ultraviolet light absorber sample, and calculating the content according to the standard curve. According to the method, the content of the mixed binary triazine ultraviolet light absorber is simultaneously and rapidly measured in multiple solvents by adopting the first-order derivative spectrophotometric method, the interference of another to-be-measured component is eliminated, the accuracy is high, complicated pretreatment and separation processes are not needed, the operation is convenient and rapid, and the technical and equipment basic requirements are low.

Description

Technical Field

[0001] The invention relates to the technical field of analytical chemistry, in particular to a method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a variety of solvents. Background Art

[0002] Organic UV absorbers are widely added to personal protective equipment to protect human skin from ultraviolet radiation. With the extensive use of personal protective equipment, a large amount of organic UV absorbers are discharged into the environment. In recent years, the application scope of triazine UV absorbers has been continuously expanded due to their excellent characteristics such as broad-spectrum UV absorption ability and inherent photostability. However, due to their large octanol-water partition coefficient and large molecular weight, they will accumulate in the body. For example, the literature: Environ. Sci. Technol. Lett. 2022, 9, 844-850, the presence of triazine UV absorbers was detected in human breast milk. The currently reported detection methods of triazine UV absorbers mainly include HPLC, GC, ICPMS and other methods.

[0003] In these methods, since the sample needs to be filtered multiple times during the pretreatment process, complex solid phase extraction and other processing processes are used after filtration, and finally it enters HPLC, GC and other instruments for quantitative analysis. A large amount of high-purity organic solvents are consumed in the process, and high-precision instruments are difficult to carry, and real-time monitoring and analysis cannot be achieved. For example, in the article WaterAir Soil Pollut, 2019, 230:172, the sample is acidified with high-purity formic acid after filtration, and then enters the solid phase extraction column, extracted with methanol and dichloromethane, and enters LC-MS / MS for detection. The mobile phase is composed of water (A) and methanol (B), both of which are acidified with 0.1% formic acid and gradient elution is used. The process is cumbersome, consumes a large amount of organic solvents, and has high technical requirements for the operator, and real-time detection cannot be achieved.

[0004] Currently, there is no reported method for rapid, convenient and accurate detection of multi-component triazine UV absorbers. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for simultaneously and quickly determining the content of a two-component triazine ultraviolet absorber in a variety of solvents. The method utilizes first-order derivative spectrophotometry to overcome the problem of traditional ultraviolet spectrophotometry that the chemical properties of the two components to be measured are similar, and the absorption peaks overlap and interfere with the maximum absorption peak. The method can quantitatively determine the content of the two-component triazine ultraviolet absorber in a variety of solvents at the same time, and has the advantages of convenience, speed, accuracy and high sensitivity.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a variety of solvents comprises the following steps:

[0008] S1. Preparation of standard solutions: standard solutions containing a certain concentration of single-component BEMT (bis-ethylhexyloxyphenol methoxyphenyl triazine), EHT (ethylhexyl triazone) and DBT (diethylhexyl butyramido triazone) and a two-component solution such as a mixture of BEMT and EHT or a mixture of BEMT and DBT were prepared respectively.

[0009] S2. Drawing of UV absorption spectra: Using blank solvent as reference solution, single-component standard solutions of BEMT, EHT and DBT and standard solutions containing two components such as BEMT and EHT mixture, BEMT and DBT mixture were scanned in the wavelength range of 200-400 nm to obtain UV absorption spectra.

[0010] S3. Selection of the best wavelength: After converting the UV absorption spectrum into a first-order derivative spectrum, analyze and determine the best absorption wavelength of each component triazine UV absorber, where the first-order derivative value of the absorbance is not interfered by other components.

[0011] S4. Drawing of standard curve: prepare standard solutions containing two-component triazine ultraviolet absorbers of different concentrations, and draw a standard curve according to the first-order derivative value of absorbance at the optimal wavelength selected above.

[0012] S5. Sample content determination: Take a mixed triazine ultraviolet absorber sample for determination and calculate the content according to the standard curve.

[0013] As a preferred technical solution, the triazine ultraviolet absorber is a triaryl-substituted triazine ultraviolet absorber such as BEMT (bis-ethylhexyloxyphenol methoxyphenyl triazine), EHT (ethylhexyl triazone) and DBT (diethylhexyl butyramido triazone); (the chemical structure information of the three compounds is shown in Table 1).

[0014] As a preferred technical solution, the method of "simultaneously determining the ultraviolet spectrum of triazine ultraviolet absorbers by spectrophotometry" specifically includes: adding a triazine ultraviolet absorber standard to an organic solvent to prepare a standard stock solution, and then diluting the standard stock solution to prepare standard solutions of different concentrations.

[0015] As a preferred technical solution, the solvent for preparing the standard solution can be a medium or low polarity organic solvent, including but not limited to chloroform, dichloromethane, ethyl acetate, ether, etc., preferably chloroform and ethyl acetate, and more preferably ethyl acetate.

[0016] As a preferred technical solution, the solvent for preparing the standard solution can be a polar organic solvent, that is, a solvent that is miscible with water in any proportion, including but not limited to dimethyl sulfoxide, N,N-dimethylformamide, acetonitrile, dioxane, n-propanol, isopropanol, tetrahydrofuran, etc., preferably dioxane and isopropanol, and more preferably isopropanol.

[0017] As a preferred technical solution, the solvent for preparing the standard solution can be a mixed solvent of an organic solvent and water, including but not limited to dimethyl sulfoxide / water, N,N-dimethylformamide / water, acetonitrile / water, dioxane / water, tetrahydrofuran / water, n-propanol / water, isopropanol / water, etc., preferably dioxane / water, isopropanol / water, n-propanol / water, dimethyl sulfoxide / water; further preferably isopropanol / water.

[0018] As a preferred technical solution, the volume ratio of the organic solvent and water mixed solution is 1-99:99-1.

[0019] As a preferred technical solution, the method of "drawing ultraviolet absorption spectrum and selecting the optimal wavelength" comprises the following steps:

[0020] Using blank solutions of organic solvent or mixtures of organic solvent and water as reference solutions, standard solutions of different concentrations containing single-component and two-component mixtures of BEMT, EHT, and DBT were prepared;

[0021] The ultraviolet absorption spectrum in the wavelength range of 200-400nm is measured and then converted to obtain the first-order derivative spectrum.

[0022] As a preferred technical solution, the simultaneous determination of BEMT and EHT includes:

[0023] (i) In medium or low polarity organic solvents, such as chloroform and ethyl acetate, the first-order derivative absorption spectra of the binary system of BEMT and EHT are respectively determined around 319 nm for EHT and around 369 nm for BEMT;

[0024] (ii) In polar organic solvents, such as isopropanol and dioxane, the first-order derivative absorption spectra of the binary systems of BEMT and EHT are measured at around 323 nm for EHT and around 370 nm for BEMT, respectively;

[0025] (iii) In mixed solvents, such as organic solvents and water, in isopropanol / water solvents and dimethyl sulfoxide / water solvents, the first-order derivative absorption spectra of the binary systems of BEMT and EHT are respectively measured at around 328 nm for EHT and around 377 nm for BEMT;

[0026] Simultaneous assessment of BEMT and DBT, including:

[0027] (i) In medium or low polarity organic solvents, such as chloroform and ethyl acetate, the first-order derivative absorption spectra of the binary system of BEMT and DBT are measured at around 318 nm for DBT and 369 nm for BEMT, respectively;

[0028] (ii) In polar organic solvents, such as isopropanol and dioxane, the first-order derivative absorption spectra of the binary system of BEMT and DBT are measured at around 322 nm for DBT and around 370 nm for BEMT, respectively;

[0029] (iii) In mixed solvents, such as organic solvent and water, in isopropanol / water solvent and dimethyl sulfoxide / water solvent, the first-order derivative absorption spectra of the binary system of BEMT and DBT are measured at around 326 nm for DBT and around 373 nm for BEMT, respectively.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The invention discloses a method for directly determining the content of a triazine ultraviolet absorber. The method comprises the preparation of a standard solution, the selection of an optimal wavelength in a first-order derivative ultraviolet spectrum and the establishment of a standard curve. The content of two components of a triazine ultraviolet absorber can be determined simultaneously.

[0032] The invention discloses a method for determining a two-component triazine ultraviolet absorber by first-order derivative ultraviolet spectrophotometry, wherein specific wavelengths are selected in different solvents for quantification, thereby eliminating interference from coexisting components, improving the accuracy and sensitivity of the determination result, requiring no special treatment of the sample, and being simple and easy to operate.

[0033] The invention adopts ultraviolet derivative spectrophotometry to detect triazine ultraviolet absorbers, has high precision, and can quickly determine the content of the two-component triazine ultraviolet absorbers after mixing, does not require complicated pretreatment and separation processes, is convenient and fast to operate, and has low requirements on technical and equipment foundations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 The names and chemical structures of three triazine ultraviolet absorbers used in the present invention;

[0036] Figure 2This is a graph showing the recovery experiment results of the present invention for simultaneously determining BEMT and DBT using the first-order derivative spectrophotometry;

[0037] Figure 3 This is a graph showing the recovery experiment results of the present invention for simultaneously determining BEMT and EHT using the first-order derivative spectrophotometry;

[0038] Figure 4 (a) UV absorption spectra of single components and mixed components of BEMT and DBT in ethyl acetate solvent, (b) UV absorption spectra of single components and mixed components of BEMT and EHT in ethyl acetate solvent, (c) first derivative spectra of single components and mixed components of BEMT and DBT in ethyl acetate solvent, (d) first derivative spectra of single components and mixed components of BEMT and EHT in ethyl acetate solvent;

[0039] Figure 5 (a) UV absorption spectra of single components and mixed components of BEMT and DBT in isopropanol solvent, (b) UV absorption spectra of single components and mixed components of BEMT and EHT in isopropanol solvent, (c) first derivative spectra of single components and mixed components of BEMT and DBT in isopropanol solvent, (d) first derivative spectra of single components and mixed components of BEMT and EHT in isopropanol solvent;

[0040] Figure 6 (a) Ultraviolet absorption spectra of single components and mixed components of BEMT and DBT in isopropanol / water mixed solvent, (b) Ultraviolet absorption spectra of single components and mixed components of BEMT and EHT in isopropanol / water mixed solvent, (c) first derivative spectra of single components and mixed components of BEMT and DBT in isopropanol / water mixed solvent, (d) first derivative spectra of single components and mixed components of BEMT and EHT in isopropanol / water mixed solvent of the present invention;

[0041] Figure 7 This is Example 3 of the present invention: (a) first derivative spectra of single components and mixed components of BEMT and DBT in dicaprylyl carbonate solvent; (b) first derivative spectra and standard curve of the mixed component of BEMT and DBT in dicaprylyl carbonate solvent in the concentration range of 1-9 mg / L; (c) first derivative spectra of single components and mixed components of BEMT and EHT in dicaprylyl carbonate solvent; (d) first derivative spectra and standard curve of the mixed component of BEMT and EHT in the concentration range of 1-9 mg / L in dicaprylyl carbonate solvent. DETAILED DESCRIPTION

[0042] The disclosure below provides many different embodiments or examples to realize different applications of the present invention. In order to simplify the disclosure of the present invention, the steps and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the examples of various specific solvents or materials provided by the present invention, but those of ordinary skill in the art can appreciate the application of other solvents and / or the use of other materials.

[0043] The above method is applied in any one or more of the following practical situations:

[0044] (1) Quality control of triazine UV absorbers.

[0045] (2) Identification of triazine UV absorbers.

[0046] (3) Determination of the content of triazine UV absorbers in environmental matrices.

[0047] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] According to the attached Figure 1-7 As shown, the embodiment of the present invention provides a method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a variety of solvents.

[0049] Example 1 Selection of Determination Solvent

[0050] Through the attempts of different types of organic solvents, the most representative one of the medium polar solvents is given in Implementation Example 1.

[0051] A first-order derivative spectrophotometric detection method for a two-component triazine ultraviolet absorber in an ethyl acetate solvent comprises the following steps:

[0052] (1) Using ethyl acetate as solvent, three standard stock solutions of BEMT, EHT and DBT were prepared at a concentration of 1 mg / mL respectively.

[0053] (2): Dilute the 1 mg / mL standard stock solution and adjust the volume to obtain 5 mg / L single-component standard solutions of BEMT, EHT, and DBT, respectively.

[0054] (3): Dilute the 1 mg / mL standard stock solution and adjust the volume to obtain 5 mg / L mixed standard solutions containing BEMT and DBT and BEMT and EHT, respectively.

[0055] (4): Using ethyl acetate as the reference solution, the UV absorption spectra of the single-component triazine and two two-component mixed standard solutions containing BEMT and DBT, and BEMT and EHT were measured at a wavelength of 200-400 nm. (See Figure 4 a and b).

[0056] (5): The ultraviolet absorption spectrum of the above standard solution in the wavelength range of 200-400nm is converted to obtain a first-order derivative ultraviolet spectrum (see Figure 4 c and d).

[0057] (6): 318 and 319 nm are taken as the quantitative wavelengths of DBT and EHT, respectively. Here, the first-order derivative value of BEMT is almost zero, and the first-order derivative values ​​of the mixed components BEMT and DBT, BEMT and EHT coincide with the first-order derivative values ​​of DBT and EHT at this point; 369 nm is taken as the quantitative wavelength of BEMT. Here, the first-order derivative values ​​of DBT and EHT are almost zero, and the first-order derivative values ​​of BEMT and DBT, BEMT and EHT coincide with the first-order derivative value of BEMT at this point.

[0058] A first-order derivative spectrophotometric detection method for a two-component triazine ultraviolet absorber in an isopropanol solvent comprises the following steps:

[0059] (1) Using isopropanol as solvent, three standard stock solutions of BEMT, EHT and DBT were prepared at a concentration of 1 mg / mL respectively.

[0060] (2): Dilute the 1 mg / mL standard stock solution and adjust the volume to obtain 5 mg / L single-component standard solutions of BEMT, EHT, and DBT, respectively.

[0061] (3): Dilute the 1 mg / mL standard stock solution and adjust the volume to obtain 5 mg / L mixed standard solutions containing BEMT and DBT and BEMT and EHT, respectively.

[0062] (4): Using isopropanol as the reference solution, the UV absorption spectra of the single-component triazine and two two-component mixed standard solutions containing BEMT and DBT, and BEMT and EHT were measured at a wavelength of 200-400 nm. (See Figure 5 a and b).

[0063] (5): The ultraviolet absorption spectrum of the above standard solution in the wavelength range of 200-400nm is converted to obtain a first-order derivative ultraviolet spectrum (see Figure 5 c and d).

[0064] (6): 322 and 323 nm are taken as the quantitative wavelengths of DBT and EHT, respectively. Here, the first-order derivative value of BEMT is almost zero, and the first-order derivative values ​​of the mixed components BEMT and DBT, BEMT and EHT coincide with the first-order derivative values ​​of DBT and EHT at this point; 370 nm is taken as the quantitative wavelength of BEMT. Here, the first-order derivative values ​​of DBT and EHT are almost zero, and the first-order derivative values ​​of BEMT and DBT, BEMT and EHT coincide with the first-order derivative value of BEMT at this point.

[0065] Example 2 Determination in mixed water / polar organic solvent

[0066] This method can achieve good results in pure organic solvents. In the real environment, triazine UV absorbers mainly exist in water environments. Whether this method can be extended to real environment water detection, we tried it by mixing a small amount of organic solvent with water.

[0067] A first-order derivative spectrophotometric detection method for a two-component triazine ultraviolet absorber in a mixed isopropanol / water (v:v, 8%) mixed solvent comprises the following steps:

[0068] (1) Using isopropanol as solvent, three standard stock solutions of BEMT, EHT and DBT were prepared at a concentration of 1 mg / mL respectively.

[0069] (2): Dilute the 1 mg / mL standard stock solution and make up to volume with a mixed solvent of isopropanol / water (v:v, 8%) to obtain 5 mg / L single-component standard solutions of BEMT, EHT, and DBT, respectively.

[0070] (3): Dilute the 1 mg / mL standard stock solution and make up to volume with isopropanol / water (v:v, 8%) solvent to obtain 5 mg / L mixed standard solutions containing BEMT and DBT and BEMT and EHT, respectively.

[0071] (4): Using a deionized water solution containing 8% (volume ratio) isopropanol as the reference solution, the UV absorption spectra of the single-component triazine and two two-component mixed standard solutions containing BEMT and DBT, and BEMT and EHT were measured at a wavelength of 200-400nm. (See Figure 6 a and b).

[0072] (5): The ultraviolet absorption spectrum of the above standard solution in the wavelength range of 200-400nm is converted to obtain a first-order derivative ultraviolet spectrum (see Figure 6 c and d).

[0073] (6): 326 and 328 nm are taken as the quantitative wavelengths of DBT and EHT, respectively. Here, the first-order derivative value of BEMT is almost zero, and the first-order derivative values ​​of the mixed components BEMT and DBT, BEMT and EHT coincide with the first-order derivative values ​​of DBT and EHT at this point; 373 and 377 nm are taken as the quantitative wavelengths of BEMT. Here, the first-order derivative values ​​of DBT and EHT are almost zero, and the first-order derivative values ​​of BEMT and DBT, BEMT and EHT coincide with the first-order derivative value of BEMT at this point.

[0074] Example 3: Application of the method in practice: Determination of triazine ultraviolet absorbers in sunscreen in dicaprylyl carbonate

[0075] Triazine UV absorbers have a high lipid-water partition coefficient. In order to evenly disperse them in sunscreen, they are often solubilized with the help of oils. Dicaprylyl carbonate is a common solubilizer in sunscreen. In order to verify the practicality and accuracy of this method, dicaprylyl carbonate was used as a solvent to test this method.

[0076] (1) Using dioctyl carbonate as solvent, three standard stock solutions of BEMT, EHT and DBT were prepared with a concentration of 1 mg / mL respectively.

[0077] (2) Dilute the 1 mg / mL standard stock solution and make up to volume with dioctyl carbonate to obtain 5 mg / L single-component standard solutions of BEMT, EHT, and DBT, respectively.

[0078] (3): Dilute the 1 mg / mL standard stock solution and make up to volume with dioctyl carbonate to obtain 5 mg / L mixed standard solutions containing BEMT and DBT and BEMT and EHT, respectively.

[0079] (4): Using dioctyl carbonate as the reference solution, the UV absorption spectra of the single-component triazine and two two-component mixed standard solutions containing BEMT and DBT, and BEMT and EHT were measured at a wavelength of 200-400 nm.

[0080] (5): The ultraviolet absorption spectrum of the above standard solution in the wavelength range of 200-400nm is converted to obtain a first-order derivative ultraviolet spectrum (see Figure 7 a and c).

[0081] (6): 316 and 318 nm are taken as the quantitative wavelengths of DBT and EHT, respectively. Here, the first-order derivative value of BEMT is almost zero, and the first-order derivative values ​​of the mixed components BEMT and DBT, BEMT and EHT coincide with the first-order derivative values ​​of DBT and EHT at this point; 372 nm is taken as the quantitative wavelength of BEMT. Here, the first-order derivative values ​​of DBT and EHT are almost zero, and the first-order derivative values ​​of BEMT and DBT, BEMT and EHT coincide with the first-order derivative value of BEMT at this point.

[0082] (7): First-order derivative spectra of 1-9 mg / L binary mixture and standard curve drawing: Take the first-order derivative values ​​of absorbance at 316, 318 and 372 nm to draw two standard curves (see Figure 7 b and d).

[0083] (8): Spike recovery experiment: The concentrations in the detection range of the standard curve, i.e., 2, 4, 6, and 8 mg / L, were taken as spike concentrations for recovery experiments. The recovery and relative error between the measured concentration and the spike concentration were calculated using Formula 1 and Formula 2, respectively. The results are shown in Figure 2 and Figure 3 .

[0084]

[0085] like Figure 2 As shown, in the binary mixture BEMT and DBT detected by first derivative spectrophotometry, the recovery of BEMT ranged from 94.9% to 110.0%, with an average recovery of 101.8%, and the recovery of DBT ranged from 100.1% to 106.6%, with an average recovery of 103.8%.

[0086] like Figure 3 As shown, the recovery of BEMT in the binary mixture BEMT and EHT was between 97.4% and 110.4%, with an average recovery of 103.4%, and the recovery of EHT was between 98.3% and 112.8%, with an average recovery of 103.5%. Based on the above recovery and relative error evaluation, the higher recovery and lower error of this method prove the effectiveness of this method, so the first-order derivative spectrophotometry used in the present invention can be used to accurately detect the content of two triazine ultraviolet absorbers in a binary mixture.

[0087] The present invention provides a method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a variety of solvents. When in use, by measuring the first-order derivative value of one component at a wavelength where the first-order derivative value of one component is zero or close to zero in the first-order derivative ultraviolet spectra of the two mixed components and the single component, the first-order derivative value of the other component in this region is not affected by the concentration of the other component, thereby overcoming the problem of absorption peak superposition interference caused by the similar absorption bands of the two substances in the initial absorption spectrum.

[0088] The basic principles, main features and advantages of the present invention are described above in combination with specific embodiments. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. The present invention may have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a variety of solvents, characterized in that: The steps include: S1. Preparation of standard solutions: standard solutions containing a certain concentration of single-component BEMT (bis-ethylhexyloxyphenol methoxyphenyl triazine), EHT (ethylhexyl triazone) and DBT (diethylhexyl butyramido triazone) and a two-component solution such as a mixture of BEMT and EHT or a mixture of BEMT and DBT were prepared respectively. S2. Drawing of UV absorption spectra: Using blank solvent as reference solution, single-component standard solutions of BEMT, EHT and DBT and standard solutions containing two components such as BEMT and EHT mixture, BEMT and DBT mixture were scanned in the wavelength range of 200-400 nm to obtain UV absorption spectra. S3. Selection of optimal wavelength: After converting the UV absorption spectrum into a first-order derivative spectrum, analyze and determine the optimal absorption wavelength of each single-component triazine UV absorber, where the first-order derivative value of the absorbance is not interfered by other components. S4. Drawing of standard curve: prepare standard solutions containing two-component triazine ultraviolet absorbers of different concentrations, and draw a standard curve according to the first-order derivative value of absorbance at the optimal wavelength selected above. S5. Sample content determination: Take a mixed triazine ultraviolet absorber sample for determination and calculate the content according to the standard curve.

2. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 1, characterized in that: The triazine ultraviolet absorber is a triazine ultraviolet absorber substituted with triaryl groups such as BEMT, EHT and DBT.

3. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 1, characterized in that: The specific method of the method "preparation of standard solution" includes: preparing standard stock solutions containing a certain concentration of single-component BEMT, EHT and DBT in different solvents respectively. Diluting the standard stock solutions to a fixed volume to obtain a series of standard solutions with different concentrations.

4. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 3, characterized in that: The solvent used to prepare the standard solution can be a medium or low polarity organic solvent, including but not limited to chloroform, dichloromethane, ethyl acetate, ether, etc., preferably chloroform and ethyl acetate, and more preferably ethyl acetate.

5. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 3, characterized in that: The solvent used to prepare the standard solution can be a polar organic solvent, that is, a solvent that is miscible with water in any proportion, including but not limited to dimethyl sulfoxide, N,N-dimethylformamide, acetonitrile, dioxane, n-propanol, isopropanol, tetrahydrofuran, etc., preferably dioxane and isopropanol, and more preferably isopropanol.

6. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 3, characterized in that: The solvent used to prepare the standard solution may also be an organic solvent / water mixed solvent, including but not limited to dimethyl sulfoxide / water, N,N-dimethylformamide / water, acetonitrile / water, dioxane / water, tetrahydrofuran / water, n-propanol / water, isopropanol / water, etc., preferably dioxane / water, isopropanol / water, n-propanol / water, dimethyl sulfoxide / water; more preferably isopropanol / water.

7. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 3, characterized in that: The volume ratio of the organic solvent to water mixed solution is 1-99:99-1.

8. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 1, characterized in that: The method "drawing of ultraviolet absorption spectrum" comprises the following steps: Using blank solvents of different standard solutions as reference solutions, the UV absorption spectra of standard solutions containing single-component and two-component mixtures of BEMT, EHT and DBT were measured at a wavelength of 200-400 nm, and then converted to obtain first-order derivative spectra.

9. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a plurality of solvents according to claim 1, characterized in that: The simultaneous determination of BEMT and EHT includes: (i) In medium or low polarity organic solvents, such as chloroform and ethyl acetate, the first-order derivative absorption spectra of the binary system of BEMT and EHT are respectively determined around 319 nm for EHT and around 369 nm for BEMT; (ii) In polar organic solvents, the conditions are as in isopropanol and dioxane, and in the first-order derivative absorption spectra of the binary systems of BEMT and EHT, the wavelengths of the wavelengths are selected around 323 nm for measuring EHT and around 370 nm for measuring BEMT, respectively; (iii) In mixed solvents, such as organic solvent and water, in isopropanol / water solvent and dimethyl sulfoxide / water solvent, the first-order derivative absorption spectra of the binary systems of BEMT and EHT are measured at around 328 nm for EHT and around 377 nm for BEMT, respectively.

10. A method for simultaneously and rapidly determining the content of a two-component triazine ultraviolet absorber in a variety of solvents according to claim 1, characterized in that: The simultaneous determination of BEMT and DBT includes: (i) In medium or low polarity organic solvents, such as chloroform and ethyl acetate, the first-order derivative absorption spectra of the binary system of BEMT and DBT are measured at around 318 nm for DBT and 369 nm for BEMT, respectively; (ii) In polar organic solvents, such as isopropanol and dioxane, the first-order derivative absorption spectra of the binary system of BEMT and DBT are measured at around 322 nm for DBT and around 370 nm for BEMT, respectively; (iii) In mixed solvents, such as organic solvent and water, in isopropanol / water solvent and dimethyl sulfoxide / water solvent, the first-order derivative absorption spectra of the binary system of BEMT and DBT are measured at around 326 nm for DBT and around 373 nm for BEMT, respectively.

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