| 光谱学与光谱分析 |
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| Determination of Major, Minor Elements in the Samples of SrCO3 Product by X-Ray Fluorescence Spectrometry |
| WANG Xiao-huan1, 2, DONG Ya-ping1*, MENG Qing-fen1, BIAN Shao-ju1, FENG Hai-tao1, LIU Xin1 |
1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract In the present paper a method for the determination of strontium，barium，calcium，magnesium，silicon，iron，aluminum and sulfur in the product of strontium carbonate by X-ray fluorescence spectrometry with pressed powder sample preparation was developed, and the standard samples were synthesized by high purity reagent. As the contents of strontium in the product of strontium carbonate were very high, the phenomenon of spectrum-peak-saturated occurred and the count rate was overflowed according to the measuring condition which was automatically given by the software system of X-ray fluorescence spectrometry. As a result, the deviation of the measurement is greater. According to analyzing the measuring condition of strontium, a method was given for reducing the count rate by reducing the measuring power of strontium, thus achieving the goal of measurement. When sulfate was measured with pressed powder sample, the results were enhanced with the increase in measuring number. In light of this situation, a method was proposed to solve the problem. As the self-forming characteristic of the product of strontium carbonate was not so well, it was very difficult to press the sample successfully. So, the condition of squash method involving the kinds of the adhesives, the mixing technique with powder sample and the pressing-time technique was discussed. During making the sample, it was found that the effects of pellet formation were better if the time could be delayed by 120 seconds. Matrix effect was corrected by alpha coefficient method, the accuracy of the method was evaluated by analysis of synthetic sample. Detection limits of 0.623-107.6 mg·g-1 were obtained. The results were in good agreement with certified values with precision of ＜2.5% RSD.
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Received: 2008-10-12
Accepted: 2009-01-16
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Corresponding Authors:
DONG Ya-ping
E-mail: chemistry1223@163.com
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