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采用熔融制样法对铁矿石进行熔融制样;以三氧化二钴(Co2O3)作为铁的内标,并对熔剂、氧化剂、脱模剂、熔融温度和熔融比例进行了讨论。采用理论α系数法、经验系数法校正基体效应和各元素的谱线重叠干扰。建立了波长色散X射线荧光光谱(WDXRF)测定铁矿石中12种组分的分析方法。本法测定铁矿标准物质(GBW07822-GBW07830)各组分的相对标准偏差(RSD)在0.41%~4.2%之间,测定值与标准值相符,且与电感耦合等离子发射光谱的对比测定结果一致。利用本法对实际铁矿样品的全铁含量进行测定,结果与化学分析法的测定结果基本一致。
Iron ore samples were prepared by melt sample preparation method. Cobalt oxide (Co2O3) was used as the internal standard of iron and flux, oxidant, mold release agent, melting temperature and melting ratio were discussed. The theoretical α coefficient method and the empirical coefficient method are used to correct the matrix effect and the overlap of the spectral lines of each element. A method for the determination of 12 components in iron ore by wavelength dispersive X-ray fluorescence spectrometry (WDXRF) was established. The relative standard deviation (RSD) of each component in the iron ore reference material (GBW07822-GBW07830) measured by this method is between 0.41% and 4.2%. The measured value is in accordance with the standard value and is in agreement with the measured results of inductively coupled plasma atomic emission spectrometry . The iron content of iron ore samples was determined by this method. The results are in good agreement with the results of chemical analysis.