Determination of rubidium, cesium and major components in lithium mica by X-ray fluorescence spectrometry with pressed powder pellet
ZENG Jiang-ping1,2, ZHENG Zhi-kang1, ZHANG Nan*1,2, WANG Jia-song1, WANG Na1, WEI Shuang1
1. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China; 2. Key Laboratory of Coast Geo-Environment,China Geological Survey, Ministry of Natural Resources, Tianjin 300170, China
Abstract：The contents of rubidium, cesium and major components in lithium mica are generally analyzed by wet chemical methods, but the pretreatment process is complicated. The contents of rubidium, cesium and major components (including silicon dioxide, aluminum oxide, total iron, calcium oxide, potassium oxide and sodium oxide) in lithium mica were determined by X-ray fluorescence spectrometry (XRF) with pressed powder pellet. The calibration curves were prepared using lithium ore reference materials and artificially synthesized calibration samples. The root mean square of each component was in range of 0.0042-0.49. The calibration curve was treated by the empirical coefficient method and the Compton scattering line internal standard method to correct the absorption-enhancement effect among components. The detection limit was 3.1-188μg/g. The proposed method was applied for the determination of rubidium, cesium and major components in certified reference materials of lithium ore (GBW 07152). The relative standard deviations (RSD, n=10) were between 0.31% and 5.0%. The contents of rubidium, cesium and major components in artificially synthesized calibration samples (which were not participated in the preparation of calibration curves), and the found results were in good agreement with the theoretical values. The experimental method was applied for the determination of rubidium, cesium and major components in actual samples of lithium mica, and the found results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES).
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