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Determination of Trace Uranium in Soil by Microwave Digestion and Fluorescence Method

A technology of microwave digestion and fluorescence method, applied in the preparation of test samples, etc., can solve the problems of difficult control of reagent dosage, affecting accurate measurement, liquid splashing, etc., and achieve the effect of shortening sample dissolution time, rapid analysis, and reducing pollution.

Active Publication Date: 2017-06-23
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current pretreatment method for trace uranium soil samples is electric heating plate heating. This treatment method has the following problems: the operation is cumbersome, the amount of reagents is not easy to control, and it takes a long time; The liquid is easy to cause splashing during the process, resulting in sample loss and affecting accurate measurement; open digestion is also easy to introduce unnecessary impurities during the operation

Method used

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  • Determination of Trace Uranium in Soil by Microwave Digestion and Fluorescence Method
  • Determination of Trace Uranium in Soil by Microwave Digestion and Fluorescence Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A microwave digestion fluorescence method for measuring trace uranium in soil comprises the following steps:

[0040] (i) Grinding the sample

[0041] Weigh three parts of 0.1000g GBW(E)070009 soil standard sample, grind to powder;

[0042] (ii) Preparation of digestion solution

[0043] Get the ground soil sample to be tested and place it in a polytetrafluoroethylene digestion tank, add 4 mL of nitric acid solution, 1 mL of sulfuric acid solution, and 1 mL of hydrogen peroxide solution, and let stand; the nitric acid solution is 65% nitric acid and Deionized water is mixed at a volume ratio of 1:1; sulfuric acid solution is made by mixing sulfuric acid with a mass fraction of 98% and deionized water at a volume ratio of 1:1; hydrogen peroxide solution is made of 30% mass fraction Hydrogen peroxide and deionized water are mixed at a volume ratio of 1:1.

[0044] (ⅲ) Microwave digestion

[0045] The solution in the polytetrafluoroethylene digestion tank was subjected...

Embodiment 2

[0056] A microwave digestion fluorescence method for measuring trace uranium in soil comprises the following steps:

[0057] (i) Grinding the sample

[0058] Weigh two 0.1000g soil samples and grind them to powder;

[0059] (ii) Preparation of digestion solution

[0060] Get the ground soil sample to be tested and place it in a polytetrafluoroethylene digestion tank, add 7ml of nitric acid solution, 3ml of sulfuric acid solution, and 3mL of hydrogen peroxide solution, and let it stand; the nitric acid solution is 65% nitric acid and Deionized water is mixed at a volume ratio of 1:1; sulfuric acid solution is made by mixing sulfuric acid with a mass fraction of 98% and deionized water at a volume ratio of 1:1; hydrogen peroxide solution is made of 30% mass fraction Hydrogen peroxide and deionized water are mixed at a volume ratio of 1:1.

[0061] (ⅲ) Microwave digestion

[0062] The solution in the polytetrafluoroethylene digestion tank was subjected to microwave digestion,...

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Abstract

The invention discloses a microwave digestion fluorescence method for measuring trace uranium in soil, which comprises the following steps: (i) taking the soil sample to be tested and grinding it into powder; (ii) taking the ground soil sample to be tested and placing it in a Add nitric acid, sulfuric acid and hydrogen peroxide into the vinyl fluoride microwave digestion tank, and let it stand still; (ⅳ) Set the temperature and time parameters of the microwave digestion program to carry out microwave digestion; (ⅳ) After the microwave digestion program is completed, cool to room temperature to obtain soil Digestion solution; (ⅴ) Configure anti-interference agent to adjust the soil digestion solution to be weakly alkaline; (ⅵ) Use liquid fluorescence method to measure the soil digestion solution. The invention effectively shortens the time of sample dissolution and reduces pollution; the operation steps are simple, and the accuracy, precision and recovery rate are all improved; the interference factors of other ions in the process of measuring the solution are reduced; and the rapid detection of trace uranium content in the soil is realized. analyze.

Description

technical field [0001] The invention belongs to a method for measuring uranium, in particular to a microwave digestion fluorescence method for measuring trace uranium in soil. Background technique [0002] Uranium is an important nuclear fuel, and trace uranium analysis is an important part of uranium content determination. Liquid fluorescence analysis is a commonly used method for measuring trace amounts of uranium because of its good selectivity, high sensitivity and fast analysis speed. [0003] Soil is an important part of the environment. With the progress of society and the improvement of human environmental protection awareness, people are paying more and more attention to the impact of soil on human health, especially the soil samples around nuclear facilities. The current pretreatment method for trace uranium soil samples is electric heating plate heating. This treatment method has the following problems: the operation is cumbersome, the amount of reagents is not e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/44
Inventor 何雨珊张桂芬关宁昕曹昆武姚江伟
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND