Abstract：The determination method of silicon and phosphorus in ferrotitanium by GB/T 4701 is time-consuming with complicated operation. In this study, the sample was dissolved using an acid soluble system composed of nitric acid, hydrochloric acid and hydrofluoric acid. Si 212.412 nm and P 185.924 nm were selected as the analytical line for silicon and phosphorus, respectively. Ferrotitanium reference materials/samples were used to draw calibration curves to eliminate the influence of matrix effect. A method for the determination of silicon and phosphorus in ferrotitanium by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The linear correlation coefficients of calibration curves for silicon and phosphorus were not less than 0.999 5. The limits of detection for silicon and phosphorus were 0.001 5% and 0.000 5%, and the limits of quantification were 0.004 9% and 0.001 7%, respectively. The contents of silicon and phosphorus in three ferrotitanium samples were determined according to the experimental method, and the relative standard deviations (RSD, n=11) of the results were less than 2%. The determination results of ferrotitanium reference materials/samples were consistent with the certified values/standard values. The contents of silicon and phosphorus in ferrotitanium samples were determined according to the experimental method and national standard method GB/T 4701, and the found results did not exceed the specified allowable deviation.
