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A kind of extraction and separation method of trace uranium element in liquid sample

A liquid sample and separation method technology, applied in the field of trace analysis sample pretreatment, can solve the problems of affecting the extraction efficiency, affecting the sensitivity of the analysis method, and the low recovery rate of the target uranium element

Active Publication Date: 2021-04-23
中国人民解放军陆军防化学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: TBP will undergo chemical degradation during use, and these degradation products will adsorb impurity ions, reduce the decontamination coefficient, and then affect the extraction efficiency, resulting in a low recovery rate of the target uranium element; in addition, in trace analysis, May affect the sensitivity of the analytical method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) dissolving dipentyl pentyl phosphate and trioctyl phosphine oxide in n-hexane to prepare a n-hexane solution in which the concentration of dipentyl phosphate is 0.15mol / L and the concentration of TOPO is 0.15mol / L;

[0023] (2) Under stirring, add the n-hexane solution prepared in 30mL step (1) dropwise in 30g polytetrafluoroethylene powder, then place it in a fume hood and stir for 1h, the n-hexane volatilizes completely and is loose; With 15 mL of HNO with a concentration of 0.2 mol / L 3 After the aqueous solution I was adjusted to a slurry state, the column was wet-packed and both ends of the chromatography column were filled with polytetrafluoroethylene filaments, and the chromatography column was balanced with 20 mL of nitric acid aqueous solution II with a concentration of 2.0 mol / L, and the concentration of nitric acid aqueous solution II was controlled. The flow rate is 2.0mL / min;

[0024] Wherein, the material of the chromatographic column used is glass, th...

Embodiment 2

[0029] (1) dissolving dipentyl pentyl phosphate and trioctyl phosphine oxide in n-hexane to prepare a n-hexane solution in which the concentration of dipentyl phosphate is 0.15mol / L and the concentration of TOPO is 0.15mol / L;

[0030] (2) Under stirring, add the n-hexane solution prepared in 30mL step (1) dropwise in 30g polytetrafluoroethylene powder, then place it in a fume hood and stir for 1h, the n-hexane volatilizes completely and is loose; With 15 mL of HNO with a concentration of 0.2 mol / L 3 After the aqueous solution I was adjusted to a slurry state, the column was wet-packed and both ends of the chromatography column were filled with polytetrafluoroethylene filaments, and the chromatography column was balanced with 20 mL of nitric acid aqueous solution II with a concentration of 2.0 mol / L, and the concentration of nitric acid aqueous solution II was controlled. The flow rate is 2.0mL / min;

[0031] Wherein, the material of the chromatographic column used is glass, th...

Embodiment 3

[0036] (1) dissolving dipentyl pentyl phosphate and trioctyl phosphine oxide in n-hexane to prepare a n-hexane solution in which the concentration of dipentyl phosphate is 0.15mol / L and the concentration of TOPO is 0.15mol / L;

[0037](2) Under stirring, add the n-hexane solution prepared in 30mL step (1) dropwise in 30g polytetrafluoroethylene powder, then place it in a fume hood and stir for 1h, the n-hexane volatilizes completely and becomes loose; With 15 mL of HNO with a concentration of 0.2 mol / L 3 After the aqueous solution I was adjusted to a slurry state, the column was wet-packed and both ends of the chromatographic column were filled with polytetrafluoroethylene filaments, and the chromatographic column was balanced with 20 mL of nitric acid aqueous solution II with a concentration of 2.0 mol / L, and the concentration of the aqueous nitric acid solution II was controlled. The flow rate is 2.0mL / min;

[0038] Wherein, the material of the chromatographic column used is...

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PUM

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Abstract

The invention relates to a method for extracting and separating trace uranium elements in liquid samples, and belongs to the technical field of trace analysis sample pretreatment. The method of the present invention mainly utilizes two kinds of organic phosphine mixtures of amyl phosphate dipentyl phosphate and trioctyl phosphine oxide as the extraction agent, and strictly controls the concentration of the rinsing nitric acid solution, so that the uranium element has a higher distribution coefficient and a higher Strong adsorption capacity, so as to achieve a better extraction and separation effect; and use a specific concentration of ammonium carbonate solution as the eluent, so that the uranium element has a higher recovery rate. The extraction and separation method of the present invention can easily and quickly realize the concentration of trace uranium elements in liquid samples, and at the same time realize the separation of some interfering heavy metal ions, and improve the stability and stability of the determination results of trace uranium elements in liquid samples. reliability.

Description

technical field [0001] The invention relates to an extraction and separation method, in particular to an extraction and separation method of trace uranium elements in a liquid sample, and belongs to the technical field of trace analysis sample pretreatment. Background technique [0002] The extraction method is an effective method for separating uranium and impurities in a dilute solution with low uranium concentration and high impurity content. In the extraction process of uranium, commonly used extractants include: organic phosphine and alkylamine extractants, such as tributyl phosphate (TBP), di(2-ethylhexyl) phosphoric acid and trioctylamine. Alkylamine extractants have limited ability to extract uranium, and organic phosphine extractants are widely used. At present, in the field of trace analysis of uranium, TBP extractant is the most widely used, but there are still some technical limitations. For example: TBP will undergo chemical degradation during use, and these de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/626G01N1/34
CPCG01N1/34G01N27/62
Inventor 聂亚峰白晓波周黎明张爱红卢彩虹周建梅赵晓光刘波王宁赵男关彩虹
Owner 中国人民解放军陆军防化学院
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