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- Title
高纯石英样品中放射性钍和铀含量的 测量方法研究.
- Authors
谢胜凯; 周良慧; 陈萌; 王利; 李黎; 曾青云; 崔建勇; 石佳
- Abstract
The content of radioactive thorium and uranium in high purity quartz sand is an important indicator for the raw material of semiconductor industry. A method for the determination of thorium and uranium in high purity quartz samples by inductively coupled plasma mass spectrometry (ICP-MS) has been established. A certain quantity of high purity quartz sample was weighted and completely digested by hydrofluoric acid and nitric acid mix solution; the solution was evaporated to dryness and the impurity elements was finally dissolved by 5 mL 2 % nitric acid solution. 187Re as the online internal standard was used to measure the isotope of 232Th and 238U. The weight of the quartz samples was allowed to be over 1 g and the matrix effect was not considered due to the relatively low content of salt in the sample solution. The range of standard working curve was 0, 0.05, 0.1, 0.2, 0.5, 1.0 µg·L-1 , the correlation coefficient of the working curve was greater than 0.999 5. The detection limits of Th and U were 0.02 ng·g-1 and 0.03 ng·g-1 respectively. For the samples with 0.32 ng·g-1 and 0.62 ng·g-1 of thorium and uranium, the measurement precision in 7 times was 5.7 % and 7.7 % respectively. Through three groups of spiked experimental samples, the average spiked recoveries were 94.8% and 91.4%. The precision and standard addition recoveries meet the requirements of verification of common chemical analysis methods. Therefore, the method can be applied to the measurement of thorium uranium in high purity quartz samples and used as reference for digestion and measurement of other elements.
- Subjects
INDUCTIVELY coupled plasma mass spectrometry; ANALYTICAL chemistry; THORIUM; MATRIX effect; ACID solutions; URANIUM compounds; QUARTZ
- Publication
World Nuclear Geoscience, 2023, Vol 40, Issue 3, p874
- ISSN
1672-0636
- Publication type
Article
- DOI
10.3969/j.issn.1672-0636.2023.03.018