| 光谱学与光谱分析 |
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| Research and Application of the ICP-MS Detection Technology for the Content of Nb and Ta in Geochemical Sample |
| LI Zi-qiang, LI Xiao-ying, ZHU Kun, XU Xiao-xia, YAN Zhi-yuan |
| Chengdu Supervision & Testing Center of Mineral Resources, Ministry of Land & Resources（Chengdu Analytical & Testing Center for Minerals & Rocks, Sichuan Bureau of Geology & Mineral Resources）, Chengdu 610081, China |
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Abstract In order to provide the test analysis technology to support the exploration and development of niobium and tantalum resource, based on the special chemical properties of Nb and Ta in geochemical sample, we studied the detection methods for the content of Nb and Ta in geochemical sample by using inductively coupled plasma mass spectrometry (ICP-MS). The results show that the sample dissolution and instrumental parameter of ICP-MS, especially the former have significant influence?on detection results. Therefore, optimizing important parameters of sample dissolution is the key of the detection technology. The optimal parameters are that: the weight of sample is 50 mg; the dosage of HF acid is 15 mL; the concentration of nitric acid and tartaric acid in the sample solution is 2% and 1.5%, respectively; the validity period of detection for sample solution ≤1 d. The detection method has been validated by the national geochemistry standard reference material. The precise and exaction of method meet the required of industry standards. The detection limits of method for Nb and Ta are 1.05 and 0.13 μg·g-1, respectively. The experiment proved that the ICP-MS detection methods, which using certain preparation process of sample solutions, is suitable for accurate and rapid determination of Nb and Ta in geochemical sample, especially geochemical survey samples which with a large amount and low content of Nb and Ta.
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Received: 2014-08-05
Accepted: 2014-11-18
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Corresponding Authors:
LI Zi-qiang
E-mail: liziqiang530@163.com
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