Study on the sample fusion method of chromium ore for the determination by X-ray fluorescence spectrometry
XU Zhi-bin1,ZHAO Chao1,YUAN Li-zhi2,YANG Guo-hui1, WANG Zhao1
1.Hebei Entry-exit Inspection and Quarantine Technical Center, Tangshan 063611, China; 2.Department of Environmental and Chemical Engineering, Tangshan College, Tangshan 063000, China
Abstract：There were some problems during the fusion of chromium ore sample such as low solubility in flux, large dilution ratio and splashing caused by bubbles. In order to solve these problems, the solubility curve of chromic oxide in different flux systems was investigated and prepared. The effect of chromium valence on the solubility was studied. It was found that the infusibility of chromium ore was due to that the weakly acidic chromic oxide was easily fusible in alkaline flux but infusible in acidic borate flux, while the hexavalent chromium was fusible in weakly acidic lithium metaborate due to its stronger alkalinity. Based on the experimental results, the following sample fusion condition was proposed: the mixed flux of lithium tetraborate and sodium nitrate (in mass ratio of 3∶1) was used; the sample was fused at 1 150 ℃ for 15 min; finally, the content of chromium, iron, silicon, aluminum and phosphorus in chromium ore was simultaneous determined by X-ray fluorescence spectrometry (XRF). Two standard samples of chromium ore were determined, and the found results were consistent with the certified values. The relative standard deviations (RSD, n=6) was between 0.36% and 1.4%. Compared to the traditional sample preparation method, the dilution ratio in proposed method was reduced. It solved some problems, for example, incapable determination of phosphorus for metaphosphate flux, easy crystallization of borate flux, and inaccurate determination of chromium.
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XU Zhi-bin,ZHAO Chao,YUAN Li-zhi,YANG Guo-hui,WANG Zhao. Study on the sample fusion method of chromium ore for the determination by X-ray fluorescence spectrometry. , 2015, 35(7): 27-31.
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