Abstract：The conventional national standard methods (EDTA titration or spectrophotometry) were not suitable for the analysis of aluminum in stainless steel with mass fraction less than 0.01%.The virtual analysis channel of aluminum was newly established to recreate the analysis curve of virtual channel. The interference of high-content coexisting elements in stainless steel was eliminated. The low-content aluminum was corrected by high and low standard method based on the analysis range of aluminum after separation by original channel and virtual channel. The analysis accuracy of trace aluminum in stainless steel by spark source atomic emission spectrometry was improved. The testing results proved that the proposed method significantly enhanced the determination accuracy of trace aluminum in stainless steel by spectrometry. When the mass fraction of aluminum in stainless steel was less than 0.001%, the determination error of proposed method could be controlled within 0.000 5%. Moreover, the analysis precision was similar to that of inductively coupled plasma atomic emission spectrometry(ICP-AES). The statistical analysis indicated that no drift was observed for curve of aluminum after correction within 12 h. The uniformity of production samples could meet the requirements of analysis. Therefore, the proposed method could satisfy the requirements of rapid ladle analysis of stainless steel production samples.
