A Raman spectroscopic analysis method for hexavalent uranium

A technology of Raman spectroscopy and analysis method, which is applied in the field of Raman spectroscopy analysis of hexavalent uranium, which can solve problems such as the impact on the accuracy of analysis results, increase the burden of radioactive operations, and difficult recovery of analyzed samples, so as to achieve online analysis and solve unfavorable Influence, effect of good versatility

Active Publication Date: 2017-09-12
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Application Information

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Problems solved by technology

[0008] In order to solve the problem that the addition of internal standard substances in the Raman spectroscopic analysis of uranium in the organic phase system of the PUREX process significantly increases the burden on radioactive operations and affects the accuracy of the analysis results; changing the invasion of internal standard substances makes it difficult to recover the analyzed samples , and produce defects such as radioactive waste liquid that is difficult to handle, the invention provides a Raman spectroscopic analysis method for hexavalent uranium

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  • A Raman spectroscopic analysis method for hexavalent uranium
  • A Raman spectroscopic analysis method for hexavalent uranium
  • A Raman spectroscopic analysis method for hexavalent uranium

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Embodiment 1

[0027] A Raman spectroscopic analysis method of uranium hexavalent, including the following steps:

[0028] (1) Prepare uranyl nitrate organic solutions with hexavalent uranium concentrations of 5.0g / L, 10.0g / L, 20.0g / L, 40.0g / L, 60.0g / L, 80.0g / L, 107.0g / L , Separately collect its Raman spectra, the obtained Raman spectra are shown in figure 1 , The solvents used in the uranyl nitrate organic solution are all 30v% TBP / kerosene;

[0029] (2) After subtracting the fluorescence background from the Raman spectrum data of the uranyl nitrate organic solution of each concentration of uranium hexavalent, divide it by 1065 cm -1 The peak intensity of the solvent at the position, that is, using the solvent as the internal standard, a series of relative Raman spectra with the relative intensity as the ordinate are obtained, and the obtained Raman spectra are shown in figure 2 , With each relative Raman spectrum 860cm -1 Draw a standard curve between the peak intensity of the hexavalent uraniu...

Embodiment 2

[0032] A Raman spectroscopic analysis method of uranium hexavalent, including the following steps:

[0033] (1) Prepare organic solutions with hexavalent uranium concentrations of 5.0g / L, 10.0g / L, 20.0g / L, 40.0g / L, 60.0g / L, 80.0g / L, 107.0g / L, and collect them separately For its Raman spectrum, the solvents used in the organic solution are all 30v% TBP / n-dodecane;

[0034] (2) After subtracting the fluorescence background from the Raman spectrum data of the organic solution of each concentration of uranium hexavalent, divide it by 1065 cm -1 The peak intensity of the solvent at the position, that is, using the solvent as the internal standard, a series of relative Raman spectra with the relative intensity as the ordinate are obtained, and each relative Raman spectrum is 860 cm -1 Draw a standard curve between the intensity of the hexavalent uranium spectrum peak and the corresponding uranium concentration, and the correlation coefficient r=0.99;

[0035] (3) Collect the Raman spectrum...

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Abstract

The invention relates to a Raman spectrum analysis method. In order to solve many unfavorable effects caused by the addition of the internal standard substance in the Raman spectroscopic analysis of uranium in the PUREX process, the present invention provides a Raman spectroscopic analysis method for hexavalent uranium. The method includes the following steps: preparing a series of organic solutions containing different concentrations of hexavalent uranium, and collecting their Raman spectra respectively; preparing a series of relative Raman spectra with relative intensity as the ordinate, and drawing a standard curve; The relative Raman spectrum of the uranium sample to be tested is obtained, and the relative intensity of the hexavalent uranium spectral peak is substituted into the standard curve to obtain the hexavalent uranium concentration of the sample to be tested. The analysis method of the invention adopts the solvent of the organic phase of the PUREX process itself as the internal standard, and does not need to add an internal standard substance, fundamentally solves the adverse effect of the addition of the internal standard substance on the accuracy of the analysis result, and the analytical sample is easy to recover and does not need to be added. Generate radioactive waste liquid, which significantly reduces the burden of radioactive operations.

Description

Technical field [0001] The invention relates to a Raman spectrum analysis method, in particular to a Raman spectrum analysis method of uranium hexavalent. Background technique [0002] In the PUREX process, the quantitative analysis of uranium hexavalent in the organic phase system is an important means to ensure the stable and reliable operation of the entire process. In addition, it has the characteristics of many analysis points and high analysis frequency. Therefore, the analysis method used should be equipped with analysis. The characteristics of fast speed and accurate analysis results. At present, the commonly used methods for quantitative analysis of uranium in organic phase systems mainly include: titration, gamma absorption, etc. [0003] As a classic method, the titration method is widely used in the quantitative analysis of uranium and has high accuracy. However, the method has slower analysis speed, cumbersome operation, and higher requirements for operators. It is di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 白雪李定明常志远
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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