In situ method for determining volume and solubility of minerals in DAC

Abstract

The present invention provides a method for in situ determination of the volume and solubility of minerals in a DAC, comprising: placing a sample to be tested and a solvent into a DAC sample chamber, generating an initial three-dimensional stereoscopic image of the sample at room temperature and pressure using Raman spectroscopy three-dimensional imaging technology, and calculating the initial volume of the sample (imgabs0#); raising the temperature and pressure to target conditions and stabilizing them, generating a real-time three-dimensional stereoscopic image of the sample using Raman spectroscopy three-dimensional imaging technology, and calculating the volume of the sample under the target conditions (imgabs1#); calculating the mass difference between the sample at room temperature and pressure and the target conditions based on the sample's bulk compressibility and thermodynamic parameters, and calculating the solubility (imgabs2#) based on this mass difference and the solvent mass. This method is simple to operate, highly accurate, and widely applicable. It overcomes the problems of traditional methods, such as reliance on standard curves, complex experimental procedures, and sensitivity to instrument performance and environmental factors, and is suitable for in situ solubility determination of minerals and organic matter.

Description

Technical Field

[0001] The present invention relates to the technical field of diamond anvil cell (DAC), and in particular to a method for in-situ measuring the volume and solubility of minerals in DAC. Background Art

[0002] The diamond pressure cell combined with a temperature control system can produce high temperature and high pressure conditions. It is currently the most commonly used portable device for simulating the static high-pressure environment of the deep sea abyss and the high temperature and high pressure conditions inside planets. However, achieving in-situ accurate measurement of sample volume in DAC faces significant technical challenges. This is not only due to the tiny size of the sample, but also because it is in an extremely high pressure or high temperature and high pressure environment. At present, the commonly used volume measurement techniques include optical microscopy observation, in-situ resistivity measurement and in-situ sound velocity measurement. Among them, the optical microscopy observation method is only applicable to samples with regular shape, high transparency and small deformation under high temperature and high pressure; the in-situ resistivity measurement method requires that the sample has a certain electrical conductivity, stable structure and internal uniformity, but the samples in DAC often show inhomogeneity due to pressure gradients and temperature gradients; the in-situ sound velocity measurement method not only requires the sample to maintain structural stability and no plastic deformation under high temperature and high pressure, but also is complicated to operate, and data analysis needs to consider multiple factors.

[0003] Raman spectroscopy is a powerful tool for rapid, non-destructive, and intelligent characterization of the microstructure of materials. Its 3D imaging capabilities not only provide a 3D image and volumetric information of a sample, but also provide Raman spectra and structural details at each pixel. Combining DAC with 3D Raman spectroscopy allows for in situ determination of carbonate volume changes and solubility under high-temperature and high-pressure conditions.

[0004] However, the current mainstream technical method based on the principle of positive correlation between molecular Raman vibration intensity and concentration has obvious limitations. First, this method requires calibration of a standard curve, but the strength of the Raman signal is extremely sensitive to the instrument status and laboratory conditions, which limits the universality of the standard curve and makes it only applicable to specific Raman spectrometers and DAC devices in specific environments. At the same time, it increases the workload of the initial calibration. At the same time, the solute [CO3] under high temperature and high pressure 2- The characteristic Raman peak shape of the solvent H2O changes, which seriously affects the accuracy of the fitting results. As the temperature and pressure gradually increase, [CO3] 2- The symmetrical stretching vibration peak of [CO3] quickly weakens and broadens, and when the temperature exceeds 400 °C, the peak is 2- As the degree of hydrolysis increases, [HCO3] - Raman vibration peak of [CO3] 2- and [HCO3] -The different Raman scattering cross sections require consideration of the differences in coefficients, which undoubtedly further complicates experimental data processing and interpretation. Furthermore, at high temperatures and pressures, the characteristic Raman peak of H2O exhibits weakening, broadening, splitting, and peak shape asymmetry, which severely interferes with peak shape fitting and peak intensity calculations, leading to significant deviations in carbonate solubility determination results. Summary of the Invention

[0005] The purpose of the present invention is to combine DAC with high-resolution Raman spectroscopy three-dimensional imaging technology to propose a more universal, simple to operate, and accurate in situ method for measuring the volume and solubility of carbonate minerals in DAC, so as to solve the problems faced by the existing technology such as complex experimental operation, low universality, and poor accuracy.

[0006] To achieve the above-mentioned purpose, the technical solution provided by the present invention includes the following steps:

[0007] S11. Place the sample to be tested and the solvent into the DAC sample chamber, generate an initial three-dimensional image of the sample to be tested at room temperature and pressure using Raman spectroscopy three-dimensional imaging technology, and calculate the initial volume of the sample to be tested based on the initial three-dimensional image. ;

[0008] S12. After the temperature and pressure are raised to the target conditions and stabilized, a real-time three-dimensional image of the sample to be tested is generated using Raman spectroscopy three-dimensional imaging technology, and the volume of the sample to be tested under the target conditions is calculated. ;

[0009] S13. Calculate the mass difference between the sample at room temperature and pressure and the target conditions based on the bulk compressibility and thermodynamic parameters of the sample to be tested, and calculate the solubility based on the mass difference and the solvent mass. .

[0010] Furthermore, the solvent is a deionized water solution.

[0011] Furthermore, a three-dimensional Raman image of the sample to be tested is generated by Raman spectroscopy three-dimensional imaging technology. Specifically, under a Raman microscope, Raman spectroscopy three-dimensional imaging parameters are set, Raman spectroscopy data of the sample to be tested is collected, and a three-dimensional Raman image of the sample to be tested is reconstructed based on the collected Raman spectroscopy data.

[0012] Furthermore, the Raman spectrum three-dimensional imaging parameters include: imaging area size, scanning step length, single spectrum integration time, laser power and number of scans.

[0013] Furthermore, by combining the initial 3D stereo image and volume calibration parameters Calculate the initial volume of the sample to be tested , the calculation of volume calibration parameters specifically includes:

[0014] Obtain a three-dimensional image of the sample to be tested by electronic computer tomography to calculate the scanning volume of the sample to be tested ;

[0015] The three-dimensional Raman spectrum of the sample to be tested is obtained by Raman spectroscopy three-dimensional imaging technology to calculate the test volume of the sample to be tested. ;

[0016] The volume calibration parameters are calculated based on the scan volume and the test volume. The calculation formula is:

[0017] .

[0018] Furthermore, the volume of the sample to be tested under target conditions is calculated based on the initial volume and the real-time three-dimensional image. , specifically including:

[0019] Calculate the Raman test volume of the sample to be tested based on real-time 3D stereo images ,

[0020] According to the Raman test volume of the sample to be tested and volume calibration parameters Calculate the volume of the sample under target conditions using the following formula:

[0021] .

[0022] Furthermore, the solubility of the sample under target conditions is calculated based on the initial volume and real-time three-dimensional image. , specifically including:

[0023] Based on the initial volume of the sample to be tested Its density at room temperature and pressure Calculate the initial mass of the sample to be tested , the calculation formula is:

[0024] ;

[0025] Based on the volume of the DAC sample chamber and the density of water at room temperature and pressure, combined with the initial volume of the sample to be tested, the mass of the solvent is calculated ;

[0026] Calculate the mass of the sample under target conditions based on real-time 3D images, volume compressibility, and thermodynamic parameters of the sample ;

[0027] Calculate the dissolved amount of the sample to be tested After unit conversion, the amount of substance dissolved in the sample to be tested is obtained n, combined with the solvent mass to calculate the solubility of the sample under target conditions , the calculation formula is as follows:

[0028] .

[0029] Furthermore, the method is applicable to all minerals and organic matter with Raman activity.

[0030] Furthermore, the method is applicable to carbonates, silicates, sulfates and phosphates, etc.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. Simple operation. This method eliminates the need for calibration of a standard curve, thus avoiding errors caused by non-standard standard curves and significantly reducing the complexity and tediousness of experimental operations. The method has no special or additional requirements for DAC model or sample loading method. Once the Raman spectroscopy parameters are set, 3D imaging data acquisition is fully automated. Compared to in-situ resistivity and sound velocity measurements, this method is very simple to operate.

[0033] 2. High accuracy. The traditional method of in-situ determination of carbonate solubility is to directly measure [CO3] in the solution. 2- The present invention takes a different approach and obtains the amount of dissolved substances by quantitatively studying the change in carbonate volume, and then obtains the solubility of the carbonate to be tested under the temperature and pressure conditions. The present invention does not need to directly measure the Raman spectrum of the solution, thus avoiding the solute [CO3] 2- and the peak shape changes of solvent H2O and [HCO3] at high temperature - Fitting errors caused by factors such as the appearance of Raman vibration peaks. Meanwhile, in mineral volume measurements, the appearance of Raman vibration peaks reflects the intrinsic molecular structure and composition of the sample and is unaffected by factors such as sample size and geometry, temperature, and pressure gradients. Therefore, the present invention can avoid interference with measurement accuracy caused by these external factors.

[0034] 3. Broad applicability. First, the present invention does not rely on the relative intensities of Raman peaks to determine carbonate solubility, and is therefore unaffected by the state of the Raman spectrometer or laboratory conditions. This method is applicable to any Raman instrument in any laboratory. Second, the present invention is applicable to all substances exhibiting Raman vibrational activity, and since the vast majority of geological minerals and organic matter possess characteristic Raman vibrational peaks, the method has a very broad scope of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 The figure is a schematic diagram of the overall process of a method for in-situ determination of the volume and solubility of minerals in DAC provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below with reference to the accompanying drawings. The enumerated embodiments are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] Reference Figure 1 The embodiment of the present invention provides a method for in-situ determination of the volume and solubility of minerals in DAC, comprising the following steps:

[0039] S11. Place the sample to be tested and the solvent into the DAC sample chamber, generate an initial three-dimensional image of the sample to be tested at room temperature and pressure using Raman spectroscopy three-dimensional imaging technology, and calculate the initial volume of the sample to be tested based on the initial three-dimensional image. .

[0040] In this embodiment, a three-dimensional Raman image of the sample to be tested is generated by using Raman spectroscopy three-dimensional imaging technology. Specifically, under a Raman microscope, Raman spectroscopy three-dimensional imaging parameters are set, Raman spectroscopy data of the sample to be tested is collected, and a three-dimensional Raman image of the sample to be tested is reconstructed based on the collected Raman spectroscopy data.

[0041] Among them, the Raman spectrum three-dimensional imaging parameters include: imaging area size, scanning step length, single spectrum integration time, laser power and number of scans.

[0042] As a preferred embodiment, this embodiment combines the initial three-dimensional stereo image and volume calibration parameters Calculate the initial volume of the sample to be tested , the calculation of volume calibration parameters specifically includes:

[0043] The three-dimensional image of the sample to be tested is obtained by electronic computed tomography (CT spatial resolution is less than 500 nm) to calculate the scanning volume of the sample to be tested. ;

[0044] The sample to be tested and the solvent are placed in the DAC sample chamber, and the three-dimensional Raman spectrum of the sample to be tested is obtained by Raman spectroscopy three-dimensional imaging technology to calculate the test volume of the sample to be tested. ;

[0045] The volume calibration parameters are calculated based on the scan volume and the test volume. The calculation formula is:

[0046] .

[0047] S12. After the temperature and pressure are raised to the target conditions and stabilized, a real-time three-dimensional image of the sample to be tested is generated using Raman spectroscopy three-dimensional imaging technology; the volume of the sample to be tested under the target conditions is calculated. .

[0048] The solvent is a deionized water solution, which is widely applicable to the coexistence system of minerals and various fluids in subduction zones and orogenic belts in the field of geological science.

[0049] S13. Combine the sample's bulk compressibility and thermodynamic parameters to obtain the mass difference between the initial and target conditions. The ratio of this to the initial solvent mass is the solubility. .

[0050] The volume of the sample under target conditions is calculated based on the initial volume of the sample and the real-time three-dimensional image. , specifically including the following operations:

[0051] S21. Calculate the Raman test volume of the sample to be tested based on the real-time three-dimensional image .

[0052] S22, according to the Raman test volume of the sample to be tested and volume calibration parameters Calculate the volume of the sample under target conditions using the following formula:

[0053] .

[0054] Calculate the solubility of the sample under target conditions based on the initial volume and real-time 3D images , specifically including the following operations:

[0055] S31, based on the initial volume of the sample to be tested Its density at room temperature and pressure Calculate the initial mass of the sample to be tested , the calculation formula is:

[0056] .

[0057] S32. Based on the volume of the DAC sample chamber and the density of water at room temperature and pressure, combined with the initial volume of the sample to be tested, calculate the mass of the solvent .

[0058] S33. Calculate the mass of the sample under target conditions based on the real-time three-dimensional image, volume compression coefficient and thermodynamic parameters of the sample. .

[0059] S34. Calculate the dissolved amount of the sample to be tested After unit conversion, the amount of substance dissolved in the sample to be tested is obtained n , combined with the solvent mass to calculate the solubility of the sample under target conditions , the calculation formula is as follows:

[0060] .

[0061] The method provided in this embodiment is applicable to all minerals and organic matter with Raman activity, including (but not limited to) carbonates, silicates, sulfates, and phosphates.

[0062] The following two specific examples illustrate how to use the above method to in situ determine the volume and solubility of carbonate minerals in DAC.

[0063] (1) In situ method for determining the volume of carbonate minerals in DAC:

[0064] First, determine the volume calibration parameters. Raman spectroscopy is highly sensitive to the sample's molecular structure. Raman signals are generated in any area covered by the laser spot. Therefore, a key factor influencing the spatial resolution of confocal Raman imaging is the spot size. Factors affecting spot size are primarily the numerical aperture of the objective lens and the diamond anvil cell in the DAC. DAC imaging often uses ultra-telephoto objectives with numerical apertures ranging from 0.25 to 0.45. Furthermore, due to the difference in refractive index between the diamond and air in the DAC, as well as interface effects, the spot size increases when the laser beam is focused onto the sample through the diamond anvil cell. This results in a deviation between the actual sample volume obtained by 3D Raman imaging and the actual volume. However, the effects of the objective lens numerical aperture and diamond anvil cell on spot size are essentially fixed. Therefore, determining the volume calibration parameters (i.e., the calibration coefficient for the deviation between the actual sample volume and the Raman measurement volume) is sufficient to accurately determine the sample volume in the DAC using 3D Raman imaging.

[0065] Computed tomography (CT) is an advanced imaging technology that can provide three-dimensional images and volume information of samples at the submicron scale. (Note: CT cannot be used in conjunction with DAC and can only scan the volume of bare samples at room temperature and pressure.) This example uses CT to accurately measure the volume of a standard sample and establish a conversion coefficient between this volume and the 3D Raman test volume, namely the volume calibration parameter. The specific method is as follows:

[0066] Calcite (CaCO 3 ) is one of the most common minerals on the earth's surface. Calcite is taken as an example below to describe the specific implementation process of this embodiment.

[0067] (1) A randomly crushed natural calcite sample was selected as a standard sample. The sample was scanned using CT (Xradia 620 Versa) technology, and the data was analyzed using VGStudio Max 3.0 software to obtain the initial three-dimensional image and CT volume of the standard sample. =4,244,757.629 (Spatial resolution 312.5 nm).

[0068] (2) Place the standard sample and solvent (deionized water is used here) into the DAC sample chamber, focus (Olympus 20×) under a Raman microscope (WITec Alpha300), and set the Raman spectrum 3D imaging parameters. Imaging area X range: 320 ; Y range: 210 Z range: 200 ; Scan step: 2 Laser power: 50 mW; Single spectrum integration time: 0.05 s; Number of scans: 1. After setting, the instrument automatically collects Raman spectra and scans layer by layer.

[0069] (3) Use the data processing software (WITec FIVE 5.3) and ImageJ software provided by the Raman instrument to reconstruct the three-dimensional image and volume of the calcite standard sample. , and then obtain the volume calibration parameters .

[0070] (4) After obtaining the volume calibration parameters, the formal experiment can be carried out. Select another experimental sample (this experiment uses another randomly broken calcite as an example) and place it in the DAC sample chamber with deionized water. Set the target temperature and pressure conditions. The experiment is carried out at room temperature and pressure. The Raman test volume of the sample is obtained using the same method as above. , the actual volume of the sample is obtained by parameter calibration This result is consistent with the result of CT test (763,142.7205 The results are basically consistent with those of the 3D image processing technology (with a spatial resolution of 328.8 nm), with an error of no more than 0.02%, which once again verifies the reliability of the proposed scheme.

[0071] It should be noted that the calibration work in this embodiment selected carbonate calcite as the standard sample, mainly based on the following considerations: (1) Calcite is one of the most common minerals on the surface and is also a widely used research object in DAC experiments. The use of calcite as a standard sample is generally recognized; (2) The solubility of calcite in deionized water at room temperature and pressure is almost zero, which will not interfere with the determination of volume calibration parameters. The calibration parameters obtained in this way are more accurate and can be widely used for volume determination of various minerals such as carbonates, silicates, sulfates, and phosphates in DAC. In addition, this formal experiment was completed at room temperature and pressure in DAC, with the purpose of comparing it with the measurement results of CT (CT cannot scan samples under high temperature and high pressure) to verify the accuracy of volume measurement. The experimental operation of high temperature and high pressure is similar to that of DAC. It is only necessary to keep the temperature and pressure conditions constant and start collecting Raman spectra after the sample reaches dissolution-crystallization equilibrium.

[0072] The advantages of the method provided in this embodiment are very obvious, mainly reflected in the following three aspects:

[0073] First, it is highly universal. This method is applicable to all substances with Raman vibration activity, and the vast majority of geological minerals and organic matter have characteristic Raman vibration peaks, so the scope of application of this method is very wide.

[0074] At the same time, the measurement accuracy is high. The appearance of Raman vibration peaks reflects the intrinsic molecular structure and composition of the sample and is not affected by factors such as sample size and geometry, temperature, and pressure gradients. Therefore, interference with measurement accuracy caused by these external factors can be avoided.

[0075] Furthermore, the experimental operation is simple. This method has no special or additional requirements for DAC model or sample loading. Moreover, once the Raman spectroscopy parameters are set, 3D imaging data acquisition is fully automatic. Compared with in-situ resistivity and acoustic velocity measurements, this method is very simple to operate.

[0076] (II) In situ determination of carbonate solubility in DAC:

[0077] The limitations of existing technologies are mainly manifested in the complexity of experimental operations, low universality, and complex factors affecting accuracy. This embodiment provides a new method for in-situ determination of carbonate solubility in DAC, namely, using high-resolution Raman spectroscopy three-dimensional imaging technology to reconstruct a three-dimensional image of carbonates in high-temperature and high-pressure fluids and accurately calculate their volume. Combined with the known bulk elastic modulus, thermodynamic parameters or density of carbonates, the mass of carbonates under the temperature and pressure conditions can be obtained. The difference from the mass of the initial carbonate is the amount dissolved. This method does not require calibration of a standard curve, and the experimental operation is very simple. It is also not limited by factors such as changes in laboratory conditions, the performance of the Raman spectrometer, and the DAC device, and has high universality and test accuracy.

[0078] Calcite (CaCO 3 ) is one of the most widely distributed and common carbonates on the earth's surface. The specific implementation process of this embodiment is described using calcite as an example.

[0079] The first step is to characterize the initial calcite.

[0080] (1) Place calcite and deionized water into the DAC sample chamber and observe under a Raman microscope (WITec Alpha 300) and focus (objective lens Olympus 20×). Set the Raman spectrum 3D imaging parameters: Imaging area X range: 210 ; Y range: 140 Z range: 100 ; Scan step: 2 ; Laser power: 50mW; Single spectrum integration time: 0.05s. After setting, the instrument automatically collects Raman spectra and scans layer by layer. Based on the above data, a three-dimensional image of the sample is reconstructed to obtain its test volume . The volume calibration parameters ( =0.843965) to calibrate the volume of the initial calcite .

[0081] (2) Density of carbonate at room temperature and pressure =2.711 g / cm 3 It is known that according to mass = volume × density (M = V × ) to calculate the mass of the initial carbonate sample =2.069 At the same time, the volume of the sample chamber and the density of water at normal temperature and pressure Known, the volume of the binding sample , you can get the quality of solvent water .

[0082] The second step is to determine the solubility of calcite under high temperature and high pressure conditions.

[0083] (1) Raise the temperature to ℃, the pressure at this time is calibrated by calcite When the sample reaches the dissolution-crystallization equilibrium, the Raman test volume of calcite under this condition is obtained by the same method as above. and accurate volume .

[0084] (2) Based on the bulk compressibility of calcite and thermal expansion coefficient ℃, obtain the density of calcite under this condition :

[0085]

[0086] Combine the volume to get its mass , and the initial mass The difference is the amount of dissolved After unit conversion, the amount of dissolved carbonate is obtained. , combined with the mass of water to obtain the solubility of carbonate .

[0087] The advantages of the method provided in this embodiment are mainly reflected in the following three aspects:

[0088] First, the operation is simple. The method provided in this embodiment does not require calibration of a standard curve, thus avoiding the error caused by a "non-standard" standard curve; at the same time, it greatly reduces the tediousness and complexity of the experimental operation.

[0089] Second, high accuracy. The previous method for determining carbonate solubility was to directly measure the [CO3] in the solution. 2- The method provided in this embodiment takes a different approach and obtains the amount of dissolved substances by quantitatively studying the change in carbonate volume, thereby obtaining the solubility of the carbonate to be tested under the temperature and pressure conditions. The method does not require direct measurement of the Raman spectrum of the solution, thus avoiding the solute [CO3] 2- and the peak shape changes of solvent H2O and [HCO3] at high temperature - Fitting errors caused by factors such as the appearance of Raman vibration peaks.

[0090] Third, it is widely applicable. This method does not rely on the relative intensities of Raman peaks to determine carbonate solubility, and is therefore unaffected by the state of the Raman spectrometer or laboratory conditions. The method is applicable to any Raman instrument in any laboratory.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for in situ determination of the volume and solubility of minerals in DAC, characterized in that: The method comprises: S11, the sample to be tested and the solvent are placed in the DAC sample chamber, and the initial three-dimensional Raman image of the sample to be tested at room temperature and pressure is generated by Raman spectroscopy three-dimensional imaging technology, and the initial three-dimensional Raman image is combined with the volume calibration parameters. Calculate the initial volume of the sample to be tested ; S12. After the temperature and pressure are raised to the target conditions and stabilized, a real-time three-dimensional Raman image of the sample to be tested is generated using Raman spectroscopy three-dimensional imaging technology to calculate the volume of the sample to be tested under the target conditions. ; S13, based on the initial volume of the sample to be tested Its density at room temperature and pressure Calculate the initial mass of the sample to be tested Calculate the mass of the sample under target conditions based on the real-time 3D Raman image, volume compressibility and thermodynamic parameters of the sample , calculate the dissolved amount of the sample to be tested , according to the dissolved amount of the sample to be tested Calculate solubility using the solvent mass ; The calculation of volume calibration parameters specifically includes: Obtain a three-dimensional image of the sample to be tested by electronic computer tomography to calculate the scanning volume of the sample to be tested ; The three-dimensional Raman image of the sample to be tested is obtained by Raman spectroscopy three-dimensional imaging technology to calculate the test volume of the sample to be tested. ; The volume calibration parameters are calculated based on the scan volume and the test volume. The calculation formula is: 。 2. The method according to claim 1, characterized in that The solvent is a deionized water solution.

3. The method according to claim 1, characterized in that A three-dimensional Raman image of the sample to be tested is generated by Raman spectroscopy three-dimensional imaging technology. Specifically, the Raman spectroscopy three-dimensional imaging parameters are set under a Raman microscope, Raman spectroscopy data of the sample to be tested is collected, and a three-dimensional Raman image of the sample to be tested is reconstructed based on the collected Raman spectroscopy data.

4. The method according to claim 3, characterized in that The Raman spectrum three-dimensional imaging parameters include: imaging area size, scanning step length, single spectrum integration time, laser power and scanning times.

5. The method according to claim 1, characterized in that Calculate the volume of the sample under target conditions based on volume calibration parameters and real-time 3D Raman images , specifically including: Calculate the Raman test volume of the sample to be tested based on the real-time 3D Raman image , According to the Raman test volume of the sample to be tested and volume calibration parameters Calculate the volume of the sample under target conditions using the following formula: 。 6. The method according to claim 1, characterized in that Solubility The calculation includes: Initial quality The calculation formula is: ； Based on the volume of the DAC sample chamber and the density of water at room temperature and pressure, combined with the initial volume of the sample to be tested, the solvent mass is calculated ; The amount of dissolved sample to be tested After unit conversion, the amount of substance dissolved in the sample to be tested is obtained n , combined with the solvent mass to calculate the solubility of the sample under target conditions , the calculation formula is as follows: 。 7. The method according to claim 1, characterized in that The method is applicable to all Raman-active minerals and organic substances.

8. The method according to claim 7, characterized in that The method is applicable to carbonates, silicates, sulfates and phosphates.

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