Abstract：For the determination of light-burned dolomite samples by X-ray fluorescence spectrometry (XRF) with fusion sample preparation, the problem that there is no standard sample should be focused on. Since the light-burned dolomite was prepared by burning dolomite raw material at 1000℃, a series of certified reference material of burned dolomite with content gradient were employed to draw the calibration curve. The linear maximum derivations of calibration curves of elements were all less than 0.4%. It effectively solved the problem of lack in standard sample for dolomite. The light-burned dolomite sample was prepared by fusion at high temperature using Li2B4O7 as the flux. The determination method of SiO2, CaO and MgO in light-burned dolomite by X-ray fluorescence spectrometry (XRF) with fusion sample preparation was established. The fusion sample preparation conditions were optimized: the dilution ratio between sample and flux was 1:13; three drops of 500g/L NH4Br solution were used as release reagent; the mixture was fused at 1100℃ for 15min. The fused glass sheet produced was uniform, transparent and free of air bubbles, which could meet the determination requirements. The proposed method was applied for the determination of SiO2, CaO and MgO in actual light-burned dolomite samples. The relative standard deviations (RSD, n=10) of the results were between 0.22% and 1.4%. The trueness test results indicated that the determination results of light-burned dolomite samples were consistent with those obtained by national standard methods, i.e., GB/T 3286.1-2012 and GB/T 3286.2-2012.
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YANG Zhong-mei, LI Jing, ZHANG Chun-hua. Determination of main components in light-burned dolomite by X-ray fluorescence spectrometry with fusion sample preparation. , 2020, 40(7): 82-86.
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