Apparatus for simultaneously determining sulfate radical and phosphate radical in high-level radioactive liquid waste and method thereof

Abstract

The invention belongs to the technical field of radioactive waste liquid analysis, and discloses an apparatus for simultaneously determining sulfate radical and phosphate radical in high-level radioactive liquid waste and a method thereof. The apparatus and the method use a raman spectrometer to realize the analysis of sulfate radical and phosphate radical in the high-level radioactive liquid waste, wherein a sampling device and an analytical device are respectively connected with an analytical hot chamber through a tunnel arranged on the analytical hot chamber. The apparatus and the method have the beneficial effects that pretreatment is not required, operation is simple, and on-line analysis and long-distance control can be realized.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste liquid analysis, and in particular relates to a device and method for simultaneously measuring sulfate and phosphate in high-level radioactive waste liquid. Background technique [0002] High-level waste liquid has high radioactive specific activity, high heat release rate, and contains some nuclides with long half-life and high biological toxicity. Therefore, their processing and disposal technology is complicated, difficult and expensive, and has become a key research and development topic for radioactive waste management in the world today. [0003] Before the treatment and disposal of high-level radioactive waste, it is necessary to conduct a comprehensive analysis of the chemical composition and radionuclides of high-level radioactive waste to provide complete and accurate source item analysis data. During the vitrification process of high-level waste liquid, the proportion of basi...

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Problems solved by technology

The sample to be tested needs to be highly diluted. The main reason is that the concentration of the sample to be tested exceeds the detection range of the ion chromatography. If it is not diluted, it cannot be measured

However, the dilution operation of high radioactive samples inevitably has the following problems: ①High dilution increases the influence of the background in the measurement process, and at the same time the dilution process will bring large deviations; ②The high radioactive The high-fold quantitative dilution of the sample is difficult to operate; ③ Even if the high-level sample is diluted 200-1000 times, its radioactivity is still strong, at 10 9 Bq / L level

[0005] In order to solve the above problems, Shao Shaoxiong and others published the relevant literature of "Direct Determination of Sulfate in Simulated High-Level Waste Liquid by Raman Spectroscopy" in the journal "Nuclear Chemistry and Radiation Chemistry" in 2015. Sodium sulfate and other simulated high-level radioactive waste liquid, and proposed the use of Raman spectroscopy to analyze and measure sulfate in the waste liquid, but because this is only a simulated high-level radioactive waste liquid, its composition is very simple and the radioactivity is extremely low (three uranium octaoxide It belongs to α-radioactivity, low specific activity, no need to analyze in the hot chamber, and other substances added are non-radioactive substances), and the analysis object is only sulfate radical, and the choice of measurement conditions cannot be applied to the simultaneous analysis of sulfate radical and phosphoric acid Root Simultaneous Analysis

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