Abstract：The contents of bismuth and major components in bismuth ore by X-ray fluorescence spectrometry (XRF) with pressed powder pellet sample preparation. The matrix effect was reduced by adding boric acid as diluting agent into sample. Meanwhile, the lanthanum oxide was added to stabilize the total mass absorption coefficient of sample. 0.5g of sample, 0.5g of lanthanum oxide and 2.5g of boric acid were uniformly mixed for measurement. In order to solve the problem of lack in standard sample, the certified reference materials of tungsten-bismuth ore (GBW07284) and stream sediment (GBW07317) were mixed at different ratios (1∶1, 1∶2, 1∶3 and 1∶5) to prepare calibration sample with certain content gradient of bismuth. The mixing uniformity experiment of sample showed that the relative standard deviations (RSD, n=12) values of elements were between 0.26% and 4.0%. The detection limits of elements in method were 0.004%-0.95%. The proposed method was applied to the analysis of certified reference material (GBW07241), and the measured values were within the range of error. RSDs (n=11) of measurement results were below 4%. The analysis and comparison of multiple samples indicated that measured values by proposed method were consistent with those obtained by the conventional chemical method. The proposed method could meet the requirements of analysis criteria of geological samples.
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