Method for polonium leaching in aerosol

An aerosol and leaching technology, used in radiation measurement, instruments, measuring devices, etc., can solve the problems of danger to experimenters, loss of polonium, and perchloric acid is prone to explosion, and achieves high leaching rate and reduced volatilization loss. , good stability

Pending Publication Date: 2018-05-11
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

[0004] According to the above method in daily experiments, it was found that polonium was volatilized and lost to varying degrees under the high temperature conditions of leaching, resulting in an unstable leaching recovery rate, and it was very easy to explode when operating perchloric acid, which was difficult to grasp in the experiment. , it is very dangerous to the experimenters, and the temperature is not easy to control when the perchloric acid is heated, which can easily cause the loss of polonium

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  • Method for polonium leaching in aerosol
  • Method for polonium leaching in aerosol
  • Method for polonium leaching in aerosol

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: Research on optimization of experimental conditions for polonium leaching in aerosol

[0032] 1) Acid type and concentration

[0033] Use concentrated HCl, 6mol / L HCl, and 6mol / L HCl-HF mixed solution (the volume ratio of 6mol / L HCl and 22.5mol / L HF is 1:1) to filter the filter membrane to obtain the aerosol sample to be tested and heat it to leaching The solution in the device is in a slightly boiling state, keep this state for leaching, a total of 2 times of leaching, each time 2.0h, and combine the two filtrates. Measure after purifying the source (reference method for analysis of polonium-210 in water, standard number: HJ 813-2016, or the method in the following example 2) 210 Po activity concentration. The result shows that concentrated HCl is 69% to the leaching rate of Po, and 6mol / LHCl is 103%, and 6mol / LHCl-HF mixed solution is 90%, so 6mol / LHCl and 6mol / LHCl-HF mixed solution are to 210 The leaching rate of Po is higher. However, because HF will...

Embodiment 2

[0039] Embodiment 2: the leaching research of polonium reference material

[0040] On the basis of the research in Example 1, the method for leaching polonium in the following aerosol, the method for purifying the source and the method for purifying the source are selected and determined 210 Po analysis and determination method is used for the research of this embodiment and follow-up embodiment:

[0041] (1) Membrane filtration 600m 3 aerosol samples;

[0042] (2) Cut the filter membrane obtained from the measured aerosol sample into pieces and add figure 1 In the Erlenmeyer flask of the device;

[0043] (3) to figure 1 Add activity of 1Bq to the Erlenmeyer flask 209 Po(Ⅳ) as tracer;

[0044] (4) Add 50ml 6mol / L hydrochloric acid to the leaching device to completely immerse the filter membrane in the solution, then install figure 1 leaching device;

[0045] (5) Heating the leaching device makes the solution in the leaching device in a slightly boiling state, and maintai...

Embodiment 3

[0060] Example 3: Acquisition and leaching analysis of polonium aerosol samples

[0061] From October 2013 to January 2014, aerosol samples were collected by glass fiber filter membrane in Taiyuan area, and the aerosol samples were collected after leaching and purification. 210 Po analysis, the results are shown in Table 3 below.

[0062] Table 3 Analysis and determination results of polonium in aerosol samples

[0063]

[0064] In Table 3 above, according to the measured 209 Po, 210 Po count and 209 Po known activity, can be calculated according to formula (1) in the measured aerosol 210 Po activity concentration:

[0065]

[0066] In formula (1):

[0067] A 210 Po: in the measured aerosol sample 210 Po activity concentration, unit mBq / m 3 (1Bq / m 3 =1000mBq / m 3 );

[0068] A 209 : tracer 210 Amount of Po added, unit: Bq;

[0069] N 210 : on plated sheet 210 Count of Po;

[0070] N 209 : on plated sheet 209 Count of Po;

[0071] V: aerosol volume, un...

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Abstract

The invention relates to the technical field of radioactive substance impact assessment, and relates to a method for polonium leaching in an aerosol. The method sequentially comprises the steps of (1)filtering by a filtering membrane to obtain a tested aerosol sample; (2) adding the filtering membrane, which obtains the tested aerosol sample, into a leaching device; (3) adding <209>Po(IV) with certain activity into the leaching device to serve as a tracer agent; (4) adding hydrochloric acid into the leaching device, enabling the solution to completely immerse the filtering membrane, and theninstalling the leaching device; (5) heating the leaching device so as to enable the solution in the leaching device to be at a slight boiling state, keeping the state, leaching <210>Po on the filtering membrane, and filtering to respectively collect a filtrate and leaching residues; (6) transferring the leaching residues to the leaching device, adding the hydrochloric acid again, then leaching andfiltering by using a method identical to that in the step (5), and carrying out the step for 1-5 times; (7) combining the filtrates of multiple times of leaching; and (8) heating the combined filtrate in a water bath to evaporate more than 90% of the liquid, cooling to obtain a filtrate dry product containing the <210>Po and the tracer agent <209>Po. According to the method, the recovery rate ofpolonium leaching can be improved and stabilized, and thus the accuracy of a <210>Po measurement result is improved.

Description

technical field [0001] The invention belongs to the technical field of impact assessment of radioactive substances, and relates to a method for leaching polonium in aerosol. Background technique [0002] After the Fukushima nuclear accident in Japan, my country put forward higher requirements for the construction and operation of nuclear facilities. At the same time, with the increasing requirements of national environmental protection, the continuous strengthening of public environmental awareness and the implementation of energy conservation and emission reduction policies, it is very important to improve the level of relevant analysis technologies and ensure that relevant units can better complete environmental monitoring and evaluation work. significance. 210 Po is 238 Produced by the U decay chain, it is an extremely toxic α-radioactive nuclide, which widely exists in soil, rocks, water bodies, organisms and other environmental media, and can enter the human body thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/178G01T7/02G01T7/04
CPCG01T1/178G01T7/02G01T7/04
Inventor 李鹏翔李周张静高泽全王瑞俊赵杨军保莉李园杨宇轩宋沁楠姜恺
Owner CHINA INST FOR RADIATION PROTECTION
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