Method for precisely determining plutonium

A precision and titration technology, applied in the field of plutonium analysis, can solve the problems of many kinds of reagents added, complicated operation process, large amount of waste liquid, etc., and achieve the effect of accurate and reliable measurement results, simple operation process and less radioactive waste liquid

Inactive Publication Date: 2015-05-06
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

However, the operation process of this method is complicated, each step of operation needs to control the potential, the operation is difficult, there are many types of reagents to be added, many uncertain factors are introduced, and the amount of waste liquid produced is large, and osmium tetroxide is highly toxic and has a strong stimulating effect. sex

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  • Method for precisely determining plutonium

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Embodiment

[0018] Carry out precise analysis of plutonium content according to the experimental analysis procedures and selected conditions, and use potentiometric titration method to determine the plutonium content in the plutonium solution. The specific operation process is as follows:

[0019] Weigh the plutonium solution containing about 5.0mg of plutonium in a 25mL titration cup, evaporate the solution to nearly dryness, add 10mL of 1.0mol / LH 2 SO 4 Solution, add AgO (about 5mg each time) in batches until black silver oxide exists in the solution and keep it for 10 minutes; then add 1.5mL saturated sulfamic acid solution, stir for 5 minutes, stop stirring; For ferrous ammonium sulfate solution of 2.82117g / L, reduce Pu(Ⅵ) to Pu(Ⅳ), and make Fe(Ⅱ) excess about 2.0mg; The standard potassium dichromate solution is used as the titrant for titration, and the end point is indicated by the potential; according to the volume of the standard potassium dichromate solution consumed by the titr...

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Abstract

The invention relates to a method for precisely determining plutonium. The method for precisely determining plutonium comprises the following steps: (1) oxidizing plutonium in a plutonium solution into Pu(VI) by adopting excessive AgO, adding acid, and carrying out reaction for removing residual AgO; (2) then adding an excessive Fe(II) solution with known concentration, and reducing Pu(VI) to Pu(IV); (3) titrating residual Fe(II) by adopting a standard potassium dichromate solution with known concentration, and indicating a titration end point by virtue of electric potential; and (4) calculating the plutonium content in a sample according to the mass of potassium dichromate consumed at an equivalent point. The method for precisely determining plutonium has the advantages that the problem that the concentration of the potassium dichromate solution as a titrating solution is changed along with the temperature of a libratory is solved, an operating process is simpler and more convenient, less radioactive liquid waste is produced, the precision degree is high, a measuring result is accurate and reliable, the applicability is strong, and no high-toxicity substance osmium tetroxide is used.

Description

technical field [0001] The invention belongs to the technical field of plutonium analysis, in particular to a method for precisely measuring plutonium. Background technique [0002] Plutonium is an important nuclear fuel, and the analysis and determination technology of plutonium is of great significance in all aspects of nuclear fuel production and cycle. Plutonium reference materials are the preconditions for ensuring the reliability of all plutonium analysis and determination techniques, and plutonium precision analysis techniques and methods are key technologies for the development of plutonium reference materials. The invention establishes an analysis method for precise determination of plutonium by automatic potentiometric titration, which is of great significance to the development of plutonium standard materials and the precise analysis of plutonium samples. [0003] Currently, ISO 8298:2000(E) is a method for the precise determination of plutonium content by potent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/42
Inventor 朱海巧罗中艳刘权卫吴继宗邵少雄
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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