Method for determining content of metal impurities in thorium dioxide

Abstract

The invention provides a method for determining the content of metal impurities in thorium dioxide. The method comprises the following steps that a solution to be tested, a blank solution and a standard solution are provided; the solution to be tested, containing a thorium dioxide matrix and the metal impurities, is prepared by digesting a sample to be tested with a microwave digestion method; theblank solution through microwave digestion of a blank sample without containing the sample to be tested is prepared; the standard solution contains the thorium dioxide matrix and the metal impuritieswith a known concentration, and the concentration of the thorium dioxide matrix in the standard solution is identical to the concentration of the thorium dioxide matrix in the solution to be tested;and the standard solution, the blank solution and the solution to be tested are introduced into an inductively coupled plasma source mass spectrometer to obtain the concentrations of the metal impurities in the blank solution and the solution to be tested, and the content of the metal impurities in the sample to be tested is converted according to the quality of the sample to be tested. The methodis simple to operate and solves the problems of tedious operation, poor stability, poor reproducibility and the like.

Description

technical field [0001] The invention belongs to the field of analysis and detection, and relates to a method for measuring the content of metal impurities in thorium dioxide. Background technique [0002] At present, nuclear power generation uses uranium as the main fuel, and the reserves of uranium in nature are very small. The reserves of thorium as nuclear fuel are 3 to 4 times that of uranium. So far, there has not been large-scale commercial development and utilization, and compared with Uranium is easier to mine; thorium is also a more efficient fuel source, and uranium must be highly enriched before it goes into a reactor, and all thorium is directly usable nuclear fuel. Thorium dioxide is the main fuel for thorium-based molten salt solid-state reactors, and the content of impurity elements in it directly affects its quality as a nuclear fuel, and even affects the safe operation of the reactor. Therefore, it is necessary to accurately test the impurity elements in nu...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems in the prior art that the concentration of thorium matrix has a great influence on the detection, cumbersome operation, poor stability, and poor reproducibility, the present invention provides a method for determining the content of metal impurities in thorium dioxide

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