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Seawater radionuclide analysis pretreatment method

A radionuclide and seawater technology, applied in radiation measurement, instruments, etc., can solve problems such as error and low specific activity, and achieve the effect of improved accuracy and simple method

Inactive Publication Date: 2014-12-17
BEIJING RES INST OF URANIUM GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of residue produced after seawater evaporation, the specific activity of the radionuclide in the sample is diluted, and the specific activity of the radionuclide in the environment itself is low, so this processing method will bring considerable errors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The present invention comprises the following steps in turn:

[0019] The first step is to acidify the water sample; select concentrated nitric acid to adjust the acidity of the 50L seawater sample to pH=1;

[0020] The second step, add 4mL mixed carrier to the seawater sample; mixed carrier: ρ(Cs + )=5mg / mL, ρ(Co 2+ )=18mg / mL, ρ(Fe 3+ )=38mg / mL, ρ(Ba 2+ )=38mg / mL, ρ(Pb 2+ )=38mg / mL;

[0021] The third step is to add co-precipitating agent to the seawater sample; the co-precipitating agent is ammonium phosphomolybdate and ammonium sulfate, add 0.15g ammonium phosphomolybdate and 0.15g ammonium sulfate per liter of seawater sample, stir for 1 hour, and stand for 24 hours ;

[0022] The fourth step is to separate and dry the precipitate; siphon the supernatant in the third step to another empty container, suction filter the remaining mixed solution, merge the filtrate into the same container, and dry the precipitate on a low-temperature electric heating plate;

[0...

Embodiment 2

[0031] The present invention comprises the following steps in turn:

[0032] The first step is to acidify the water sample; choose concentrated nitric acid to adjust the acidity of the 50L seawater sample to pH=1.5;

[0033] The second step, add 5mL mixed carrier to the seawater sample; mixed carrier: ρ(Cs + )=6mg / mL, ρ(Co 2+ )=20mg / mL, ρ(Fe 3+ )=40mg / mL, ρ(Ba 2+ )=40mg / mL, ρ(Pb 2+ )=40mg / mL;

[0034] The third step is to add co-precipitant to the seawater sample; the co-precipitant is ammonium phosphomolybdate and ammonium sulfate, add 0.2g ammonium phosphomolybdate and 0.2g ammonium sulfate per liter of seawater sample, stir for 1.5 hours, and stand for 30 hours ;

[0035] The fourth step is to separate and dry the precipitate; siphon the supernatant in the third step to another empty container, suction filter the remaining mixed solution, merge the filtrate into the same container, and dry the precipitate on a low-temperature electric heating plate;

[0036] The fift...

Embodiment 3

[0044] The present invention comprises the following steps in turn:

[0045] The first step is to acidify the water sample; choose concentrated nitric acid to adjust the acidity of the 50L seawater sample to pH=2;

[0046] The second step, add 6mL mixed carrier to the seawater sample; mixed carrier: ρ(Cs + )=7mg / mL, ρ(Co 2+ )=22mg / mL, ρ(Fe 3+ )=42mg / mL, ρ(Ba 2+ )=42mg / mL, ρ(Pb 2+ )=42mg / mL;

[0047] The third step is to add co-precipitating agent to the seawater sample; the co-precipitating agent is ammonium phosphomolybdate and ammonium sulfate, add 0.25g ammonium phosphomolybdate and 0.25g ammonium sulfate per liter of seawater sample, stir for 2 hours, and stand for 36 hours ;

[0048] The fourth step is to separate and dry the precipitate; siphon the supernatant in the third step to another empty container, suction filter the remaining mixed solution, merge the filtrate into the same container, and dry the precipitate on a low-temperature electric heating plate;

[...

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Abstract

The invention relates to a seawater radionuclide analysis pretreatment method. The method includes 1, adjusting the pH value of the acidity of a seawater sample to range from 1 to 2; 2, adding a mixed carrier into the seawater sample; 3, adding 0.15 to 0.25g ammonium phosphomolybdate and 0.15 to 0.25g ammonium sulfate in the seawater sample per liter; 4, depositing and drying; 5, adjusting the pH value of the acidity of the filtrate to range from 8 to 10; 6, depositing and drying; 7, depositing and combining. According to the mixed carrier, Rho (Cs+)=5 to 7mg / mL, Rho (Co2+)= 18 to 22mg / mL, Rho (Fe3+)=38 to 42mg / mL, Rho (Ba2+)= 38 to 42mg / mL, and Rho (Pb2+)= 38 to 42mg / mL. By the aid of the method, gamma nuclide and total alpha and beta analysis and combined sample preparation can be implemented, the problem of influence by residue is avoided, the method is simple and easy to implement, and the accuracy is improved greatly.

Description

technical field [0001] The invention relates to a method for pre-analyzing radionuclide in seawater, in particular to a method for pre-analyzing radionuclide in seawater which is simple, easy to implement and high in accuracy. Background technique [0002] In daily environmental monitoring and evaluation, radionuclide in seawater is an important detection parameter. At present, there is no standard method for the pretreatment technology of radionuclide analysis in seawater in China. Usually, the relevant standards for radionuclide analysis in ordinary fresh water are used for reference. These standards mainly use the evaporation method for pretreatment of γ nuclides and total α and total β respectively. However, due to the large amount of residue produced after seawater evaporation, the specific activity of radionuclides in the sample is diluted, and the specific activity of radionuclides in the environment itself is low, so this processing method will bring considerable err...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T7/00
Inventor 胡小华潘景荣黄秋红苏晓阳
Owner BEIJING RES INST OF URANIUM GEOLOGY
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