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Method for simultaneously and rapidly measuring content of plutonium and nitric acid in organic phase

A technology for fast determination of nitric acid content, applied in measuring devices, material analysis through optical means, instruments, etc., to achieve the effect of simple and fast analysis process, short analysis cycle and accurate measurement results

Active Publication Date: 2014-07-02
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

[0004] In order to solve the problem that the existing analysis methods cannot realize the simultaneous determination of the plutonium and nitric acid content in the PUREX process, realize the rapid determination of the plutonium and nitric acid content in the PUREX process, and facilitate the control of the separation of uranium and plutonium, the invention provides a Simultaneous rapid determination of plutonium and nitric acid content in organic phase

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  • Method for simultaneously and rapidly measuring content of plutonium and nitric acid in organic phase
  • Method for simultaneously and rapidly measuring content of plutonium and nitric acid in organic phase
  • Method for simultaneously and rapidly measuring content of plutonium and nitric acid in organic phase

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Embodiment

[0035] A method for rapidly measuring plutonium and nitric acid content in an organic phase simultaneously, the method comprising the following steps:

[0036] (1) Establishment of a mathematical model for the determination of plutonium and nitric acid in the organic phase by near-infrared spectroscopy

[0037] (1) Preparation of sample set

[0038] a. Prepare 30% TBP-kerosene solution

[0039] Wash TBP with sodium carbonate solution, wash with deionized water until neutral; wash with KMnO 4The solution washes the kerosene, washes with sodium carbonate solution, and then washes with deionized water until neutral; accurately prepares 30% TBP-kerosene solution, and stands it for use.

[0040] b. Preparation of organic phase nitric acid mother liquor

[0041] Take a certain amount of 30% TBP-kerosene solution to extract nitric acid, discard the water phase to obtain the organic phase nitric acid mother liquor, and calibrate the concentration of the organic phase nitric acid mo...

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Abstract

The invention relates to a quantitative matter measuring method using spectrometry. Aiming to solve the problem that with current methods, the content of plutonium and nitric acid cannot be measured simultaneously in a PUREX (plutonium uranium reduction extraction) process, the invention provides a method for simultaneously and rapidly measuring the content of plutonium and nitric acid in an organic phase. The method comprises the following steps: (1) building a mathematical model for measuring the content of plutonium and nitric acid in an organic phase through near infrared spectrometry, namely preparing a sample set, collecting near infrared spectrum, building and evaluating the mathematical model and verifying the mathematical model; and (2) measuring the content of plutonium and nitric acid in the sample by the mathematical model. According to the invention, the mathematical model is built by partial least squares; the measurement of the content of plutonium and nitric acid in the to-be-measured sample is realized by the mathematical model and near infrared spectrum data of the to-be-measured sample; the method has the advantages of being simple and rapid in analysis process, strong in anti-interference ability and small in sampling amount and belongs to nondestructive analysis.

Description

technical field [0001] The invention relates to a method for quantitatively measuring substances by means of spectrometry, in particular to a method for rapidly simultaneously measuring the contents of plutonium and nitric acid in an organic phase. Background technique [0002] Spent fuel reprocessing plants usually adopt the PUREX process, which utilizes the high extractability of tributyl phosphate (TBP) for U(VI) and Pu(IV) and the easy oxidation and reduction of Pu to realize U, The extraction and mutual separation of Pu mainly include uranium-plutonium co-decontamination cycle, uranium purification cycle and plutonium purification cycle. In order to grasp the Pu(Ⅳ) and HNO in the organic phase material solution of the whole process 3 To facilitate the control of the separation of uranium and plutonium, it is necessary to conduct Pu(IV) and HNO 3 content detection. Since plutonium exists in the form of Pu(IV) in the organic phase, the determination of the amount of Pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3577
Inventor 吴继宗李定明张丽华龚焱平陈强王玲范德军易宝山吉永超陈小杰
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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