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Method for determining concentrations of uranyl nitrate and nitric acid in aqueous phase at same time

A technology of uranyl nitrate and uranyl nitrate solution, applied in the field of radioactive material measurement, can solve the problems of deviation from linearity of standard curve and increase of operational complexity, etc.

Active Publication Date: 2019-09-06
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

However, in actual detection applications, due to the influence of detector stability, dark current noise, sample placement and other factors, the standard curve may deviate from linearity, and it is usually necessary to add an internal standard to eliminate the influence
However, additional admixtures will increase the complexity of the operation, especially for high-radioactive samples, so it is best to choose the signal of the solution itself as the internal standard signal

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  • Method for determining concentrations of uranyl nitrate and nitric acid in aqueous phase at same time
  • Method for determining concentrations of uranyl nitrate and nitric acid in aqueous phase at same time
  • Method for determining concentrations of uranyl nitrate and nitric acid in aqueous phase at same time

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Embodiment Construction

[0045] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.

[0046] 1. Raman spectroscopy data processing

[0047] See figure 1 , to assign the Raman spectral peak of nitric acid solution, its 649cm -1 belongs to HNO 3 Molecular δ as , 689cm -1 belongs to HNO 3 Molecular δ sym ,716.75cm -1 belongs to NO 3 - of ν 4 , 959cm -1 for HNO 3 Molecular ν N-O , 1047.39cm -1 ν belonging to nitrate 1 ;1306cm -1 belongs to ν N＝Osym ,;1442.92cm -1 ν belonging to nitrate 3 ;1654cm -1 to belong to ν N＝Oas .

[0048] See figure 2 , UO in uranyl nitrate solution 2 2+ The strongest Raman peak is located at 870cm -1 , belonging to UO 2 2+ The ν1 is symmetrically stretched and stretched, and the nitrate is 1047cm -1 , consistent with nitric acid.

[0049] Choose 2500-3900cm -1 As the Raman shift area of ​​water, after deducting the baseline, select 2800-3800cm -1 Integrate as th...

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Abstract

The invention belongs to the technical field of radioactive substance measurement and relates to a method for determining concentrations of uranyl nitrate and nitric acid in an aqueous phase at the same time. The method comprises the following steps: (1) preparing a series of nitric acid solution and uranyl nitrate solution with known concentrations; (2) respectively determining Raman spectra of the nitric acid solution and uranyl nitrate solution with the known concentrations; (3) creating a standard curve of a nitrate concentration; (4) creating a standard curve of a uranyl ion concentration; (5) determining a Raman spectrum of a sample and calculating ANO<3-> / AH2O and AUO2<2+> / AH2O; and (6) calculating the concentrations of uranyl nitrate and nitric acid in the sample. By utilizing themethod for determining the concentrations of uranyl nitrate and nitric acid in the aqueous phase at the same time, direct measurement, no pretreatment, high selectivity and high measurement speed canbe realized, and an optical fiber can be introduced for realizing remote measurement.

Description

technical field [0001] The invention belongs to the technical field of radioactive substance measurement, and relates to a method for simultaneously measuring the concentration of uranyl nitrate and nitric acid in an aqueous phase. Background technique [0002] In the nuclear fuel cycle system, uranyl nitrate and nitric acid are the most important materials. The measurement of uranyl nitrate and nitric acid concentration is involved in the process of uranium conversion and purification, spent fuel reprocessing, etc. At present, the methods that can simultaneously determine the concentration of uranyl nitrate and nitric acid mainly include density-conductometric method, laser-induced-fluorescence spectroscopy, potentiometric titration, conductometric titration, and spectrophotometric-conductometric titration. Except for the laser-induced-fluorescence method and the density-conductivity method that can directly measure the sample, the other methods all need to add other reage...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 李定明柳倩田国新张倩慈杨素亮
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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