| 微量萤石样品消解技术及其Sm-Nd同位素高精度热离子质谱法测试 |
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| 关键词:fluorite Sm-Nd boric acid micro-samples TIMS |
| 基金项目:国家自然科学基金面上项目(编号: 41373053);中国地质调查局地质调查项目(编号: 12120115013501);国家青年自然科学基金项目(编号: 41502195; 41602200);国家重点基础研究发展计划(973计划)(编号: 2015CB453000) |
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| 摘要: |
| Micro-fluorite Sample Digestion Technology and High Precision Thermionic Mass Spectrometry Determination for Sm-Nd Isotopes |
| The Sm-Nd isotopic system is widely used in the isotopic dating and tracing of fluorite. In the process of chemical separations for the Sm-Nd isotope analysis, fluorite is dissolved by acid regularly, but it does not react with the hydrofluoric acid and nitric acid. Additionally, the special chemical structure of fluorite (CaF2) often leads to the insoluble rare earth fluoride produced by fluoride ion and rare earth ion, which results in the loss of Sm and Nd in the sample. Therefore, a large sample dosage (100~200 mg) is usually designed to meet the demands of the Sm-Nd isotope analysis in the fluoride with low content of Sm and Nd. In this study, the authors established a new experimental method to dissolve fluoride by using the HNO3+HClO4+H3BO3 solvent system. In this system, the application of H3BO3 is effective in improving the recovery of Sm and Nd in the fluoride. Furthermore, the experiments also show that adding 1 mL 0.49 mol/L H3BO3 in the mixed system of 5 mL concentrated nitric acid and 0.015 mL percholric acid has the best effect on the dissolution of fluoride. Combined with high sensitive thermal ionization mass spectrometer (Triton), the high accuracy Sm-Nd isotopic analysis of fluoride micro-samples could be realized. Compared with the conventional method, this method can reduce the dosage of fluoride sample obviously. |
| LIU Wen-gang,LI Guo-zhan,LIU Hui,CHEN Yin,XIAO Zhi-bin,ZHOU Hong-ying,ZHANG Jian,TU Jia-run,LI Hui-min.2018.Micro-fluorite Sample Digestion Technology and High Precision Thermionic Mass Spectrometry Determination for Sm-Nd Isotopes[J].Acta Geoscientica Sinica,39(1):119-124. |
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