Abstract：Determination of acid-soluble aluminum in steel by spectrophotometry and inductively coupled plasma atomic emission spectrometry could not satisfy pre-furnace rapid analysis requirements. Through orthogonal experiment, the optimal analytical conditions were established as follows: flush time of 5 s, preburn time of 4 s, exposure time of 16 s, argon flow of 180 L/h; the peak integration-spark source atomic emission spectrometric determination of acid-soluble aluminum in low alloy steel was realized with Fe 2: 281.329 nm as internal standard line and Alsol 396.2 nm as analytical line. Certified reference materials with concentration gradient were used for plotting the calibration curve. Through linear regression of the curve, the interference between elements was corrected. The method was applicable to the determination of 0.000 1%-0.50% acid-soluble aluminum in low alloy steel. Four low alloy steel certified reference materials were selected for precision test, and the relative standard deviation (RSD, n=10) was in the range of 0.78%-4.9%. Four middle-low alloy steel certified reference materials and one self-made reference materials 09Cr2aLMoRE were determined by proposed method, and the results were basically consistent with the certified values or that obtained by titrimetry method, whose determination error satisfying the requirements of National standard method GB/T222-2006. The method was suitable for pre-furnace rapid analysis.
