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Method for direct determination of concentrations of U, HNO3, HNO2 mixed components

A technology of mixing components and concentrations, applied in the field of HNO2 mixed component concentration, HNO3, and direct determination of U, which can solve problems such as complicated operation steps and inability to calculate the concentration

Active Publication Date: 2013-06-12
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the first step of the method, it is necessary to obtain the standard spectrum of various components to be measured on the measuring instrument, and the actual operation steps to obtain the standard spectrum are very complicated.
In addition, the concentration of each component in the organic phase mixed solution cannot be calculated using the formula provided in this document

Method used

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  • Method for direct determination of concentrations of U, HNO3, HNO2 mixed components
  • Method for direct determination of concentrations of U, HNO3, HNO2 mixed components
  • Method for direct determination of concentrations of U, HNO3, HNO2 mixed components

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Embodiment 1

[0038] The invention provides a method for directly measuring U, HNO 3 、HNO 2 Mixed component concentration method for U and HNO in uranium lines 2 Rapid, straightforward analysis of the application of statistical methods to HNO 3 U, HNO in aqueous solution and 30% TBP-kerosene 3 and HNO 2 The direct spectral analysis of the method uses the least square method to calculate and analyze the measurement data, and the method has statistical properties. The steps are as follows:

[0039] a) Prepare m standard samples of aqueous phase and organic phase with different concentrations;

[0040] b) The aqueous phase samples use deionized water as a reference, and use a 1cm cuvette to measure the absorbance at intervals of 0.5nm within the wavelength range of 350-500nm; the organic phase samples use 30% TBP-kerosene as a reference, and measure the absorbance in the same way ;

[0041] c) In the wavelength range of 400-500nm, select the peak and valley position on the second order ...

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Abstract

The invention belongs to the technical field of spectral analysis determination, and particularly relates to a method for direct determination of concentrations of U, HNO3, HNO2 mixed components. The method comprises the following steps: a) preparing m water-phase and organic-phase standard samples with different concentrations; b) measuring the absorbance; c) selecting a peak trough position on a second-order differential spectrum of a sample absorption spectrum as a representative wavelength position, substituting the absorbance values, U concentrations, HNO3 concentrations, and HNO2 concentrations of the m water-phase standard samples at this wavelength into a formula to obtain coefficients of F1, F2, F3. As for an organic-phase unknown sample, the absorption spectrum at 350-500 nm of each solution is measured. The coefficient F is substituted at a range of 400-500 nm, and the U concentration is solved with formula (3); the solved coefficient F is substituted at a range of 350-400 nm, and the HNO2 concentration is obtained with formula (4) by solving the equation.

Description

technical field [0001] The invention belongs to the technical field of spectral analysis and measurement, and in particular relates to a method for directly measuring U and HNO 3 、HNO 2 A method of mixing component concentrations. Background technique [0002] In the Purex process control of nuclear fuel reprocessing, the distribution of uranium acid is the main reference material for determining the process conditions. There are many analysis points for uranium, the analysis frequency is high, and the concentration range spans a wide range. There are both aqueous phase samples and organic phase samples. The existence of nitrous acid will affect the control of the post-processing process, such as affecting the direction of neptunium in the 1A tank, affecting the valence distribution of neptunium, plutonium and splinter elements. After entering the uranium-plutonium separation cycle, it will destroy the reducing agent. In severe cases, it can be Completely disrupts the sepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 李丽张虎叶国安
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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