Abstract：The content of potassium oxide, lead, zinc and arsenic was determined by X-ray fluorescence spectrometry (XRF) with pressed powder pellet. The conditions including decarbonizing manner, sample granularity, analytical lines and optical background were optimized. It was found that: the interference from high content carbon in the sample could be removed through burning thermoelectric ash at 500 ℃ for 2 h and gas ash at 600 ℃ for 3 h; the results precision was fine when the sample granularity was smaller than 125 μm; and spectral interference could be avoided with Pb-Lβ, As-Kβ, K-Kα, Zn-Kα as analytical lines; background interference could be overcome with one point background deduction for K and Zn and two-point background deduction for Pb and As; when the iron ore certified reference materials and the blast furnace dust sample which were certified by atomic absorption spectrometry and calibrated by ash were used as calibration sample to establish calibration curve, the linear correlation coefficient (R2) of four components were 0.998 5-0.999 8. Precision test was conducted on a blast furnace thermoelectric ash. The relative standard deviation (RSD, n=7) was not more than 1%. A group of blast furnace dust samples were analyzed and compared. The results of the four components were consistent with those obtained by atomic absorption spectrometry.
