Abstract: In view of the mismatch between the detection standard and product specification range for iron oxide in steelmaking promoter,as well as the deficiencies of current testing methods,an analytical method for the determination of low content of iron oxide (w≤5%) in steelmaking promoter by inductively coupled plasma atomic emission spectrometry(ICP-AES) was established.The sample was dissolved with hydrochloric acid by heating followed by filtration.The residue was ashed and subsequently fused with sodium carbonate-boric acid mixed flux (m∶m=2∶1).The melt was leached with hydrochloric acid,combined with the original filtrate,diluted to a constant volume,and then determined by instrumental analysis.The key conditions including sample digestion method and matrix interference were systematically investigated.The results showed that the combined acid dissolution and alkali fusion method achieved the best digestion effect for steelmaking promoter samples.The aluminum matrix had interference with the determination of iron oxide.The matrix matching method was adopted to prepare the calibration curve to eliminate the influence of matrix effect in this study,in other words,the aluminum matrix concentration in the standard solution series was basically consistent with that of the sample solution.The calibration curve exhibited good linearity when the iron oxide content(mass fraction) was in range of 0.01%-5.00%,and the correlation coefficient was 0.999 9.The limit of detection(LOD) was 0.003%.The content of iron oxide in steelmaking promoter samples was determined according to the experimental method.The relative standard deviation(RSD,n=7) was 0.46%-0.70%.The analytical results were in good agreement with those obtained by orthophenanthroline spectrophotometry.The results of F-test indicate that there is no significant difference between the two methods.Spiked recovery tests were performed on steelmaking promoter samples,and the recovery was between 95% and 100%.