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Method and system for jointly detecting contents of tetravalent uranium and hydrazine

A joint detection and tetravalent uranium technology, which is applied in the field of joint detection of tetravalent uranium and hydrazine content, can solve the problems of high waste liquid treatment cost, long detection time, and a large amount of waste liquid, and achieve short detection time, good timeliness, and The effect of reducing the generation of waste liquid

Pending Publication Date: 2021-07-30
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In related technologies, the titration method is mainly used to detect the content of tetravalent uranium and hydrazine nitrate. This method requires sampling and analysis, and the detection time is long, so there is a problem of poor timeliness; Waste liquid, there is a problem of high cost of waste liquid treatment

Method used

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  • Method and system for jointly detecting contents of tetravalent uranium and hydrazine
  • Method and system for jointly detecting contents of tetravalent uranium and hydrazine
  • Method and system for jointly detecting contents of tetravalent uranium and hydrazine

Examples

Experimental program
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Effect test

Embodiment 1

[0082] This example is used to illustrate the establishment method of the tetravalent uranium content determination model.

[0083] Prepare a series of tetravalent uranium standard solutions with gradient changes in tetravalent uranium concentration by using tetravalent uranium standard samples, and then use such as figure 1 The detection system shown detects the absorbance value of tetravalent uranium in each tetravalent uranium standard solution under the condition of a wavelength of 531nm, and then based on the concentration of tetravalent uranium in each tetravalent uranium standard solution and its corresponding tetravalent uranium absorbance value , establish the standard working curve, and obtain the determination model of tetravalent uranium content.

[0084] The concentration of tetravalent uranium in each standard solution of tetravalent uranium and the corresponding absorbance of tetravalent uranium are shown in Table 1.

[0085] Table 1

[0086] Tetraval...

Embodiment 2

[0091] This example is used to verify the effect of high concentration of tetravalent uranium on the detection results of hydrazine content.

[0092] Configure the following three liquids to be tested:

[0093] (1) 2.5g / L tetravalent uranium solution (containing 0.5g / L hexavalent uranium) 25μl + chromogen solution 450μl + deionized water 25μl;

[0094] (2) 25 μl of 2.5g / L tetravalent uranium solution (containing 0.5g / L hexavalent uranium) + 450 μl of chromogen solution + 25 μl of 0.0037mol / L hydrazine nitrate solution;

[0095] (3) 25 μl of 0.0037 mol / L hydrazine nitrate solution + 450 μl of developer solution + 25 μl of deionized water.

[0096] Using a spectrophotometric detection device, under the detection condition of a wavelength of 456 nm, the above three liquids to be tested were detected with the chromogenic agent as a blank, and the absorbance values ​​were recorded respectively, as shown in Table 2.

[0097] Table 2

[0098]

[0099] As can be seen from Table ...

Embodiment 3

[0102] This embodiment is used to verify the time when the test result of the spectrophotometer tends to be stable after the sample to be tested is mixed with the developer solution.

[0103] Use hydrazine standard samples to prepare standard solutions with different hydrazine concentrations, and use figure 1 The detection system shown, under the detection condition of wavelength 456nm, detects the absorbance value of each standard solution, and records the change of the absorbance value of each standard solution with time from the time when each standard solution is mixed with the chromogen solution , the detection result is as figure 2 shown.

[0104] Depend on figure 2 It can be seen that from the 10th minute after the hydrazine-containing sample to be tested is mixed with the developer solution, the detection result of the spectrophotometric detection device tends to be stable.

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Abstract

The invention relates to a method and system for jointly detecting contents of tetravalent uranium and hydrazine. According to the detection method, a spectrophotometric detection device with a plurality of flow cells is utilized, combined online detection of the content of tetravalent uranium and hydrazine can be achieved, the detection time is short, and the timeliness is good; meanwhile, the detection method can also realize automatic sampling of a to-be-detected sample, automatic mixing of the to-be-detected sample and a color developing agent solution, automatic dilution of the to-be-detected sample, automatic color development of hydrazine in the to-be-detected sample and automatic detection of the hydrazine content in the to-be-detected sample. Besides, in the detection method, a tetravalent uranium content detection pipeline and a hydrazine content detection pipeline are mutually independent, and a solution to be detected in the tetravalent uranium detection pipeline is not polluted and can flow back to a tetravalent uranium preparation system after detection is completed, so that nondestructive detection of the tetravalent uranium content is realized, generation of waste liquid can be effectively reduced, so that the waste liquid treatment cost is obviously reduced.

Description

technical field [0001] The present disclosure relates to the technical field of the nuclear industry, in particular to a method and system for joint detection of tetravalent uranium and hydrazine content. Background technique [0002] In related fields, electrolytic uranyl nitrate UO is mainly used 2 (NO 3 ) 2 Aqueous solution or Pt catalytic reduction of UO 2 (NO 3 ) 2 Aqueous solution method to prepare tetravalent uranium. [0003] In the process of preparing tetravalent uranium, the by-product nitrous acid will oxidize the tetravalent uranium to hexavalent uranium, resulting in the decrease or complete disappearance of the prepared tetravalent uranium. In order to avoid this situation, it is usually necessary to add hydrazine nitrate to the tetravalent uranium preparation system to consume the by-product nitrous acid produced by the preparation reaction. However, as the preparation reaction proceeds, the continuously generated nitrous acid will continue to consume ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/31G01N21/01G01N2021/0112
Inventor 刘焕良张丽华王玲钱红娟
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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