Determination of major and minor elements in deoxidizing agent for steel making by alkali fusion-inductively coupled plasma optical emission spectrometry
PI Ye-hua,FENG Zhao-jun*
Laboratory of the First Geological Brigde of Hubei Geological Bureau,Huangshi 435100,China
Abstract：The deoxidizing agent samples were fused with potassium hydroxide at 700 ℃ for 20 min. After acidification with HCl, the solution was diluted by 10 times. Then, the content of Si, Al, Ca, Mg, Ba, P, Cu, Fe and Sr was simultaneously determined by inductively coupled plasma optical emission spectrometry (ICP-AES) using Si 251.611 nm, Al 396.153 nm, Ca 317.933 nm, Mg 285.213 nm, Ba 233.527 nm, P 334.940 nm, Cu 213.617 nm, Fe 327.393 nm and Sr 407.771 nm as the analytical lines. The method for determination of nine elements in deoxidizing agent samples for steel making was established. Compared to the acid dissolution process, the results showed that the alkali fusion method could avoid the problems of incomplete decomposition for various common deoxidizing agents. 0.1 g of sample could be fully fused with 2.0 g of potassium hydroxide. The influence of matrix effect could be effectively eliminated by preparing the calibration curves using matrix matching method. The mass concentration of each element in certain range showed linear relationship with the corresponding emission intensity. The linear correlation coefficients of calibration curves were r≥0.999 8. The detection limits of elements were between 0.001 6% and 0.012%. The content of Si, Al, Ca, Mg, Ba, P, Cu, Fe and Sr in deoxidizing agent samples was determined according to the experimental method, and the relative standard deviations (RSD, n=11) were between 0.81% and 4.5%. The proposed method was applied to the determination of Si, Al, Ca, Mg, Ba, P, Cu, Fe and Sr in four standard samples (E511d, YSB 14609-2001, YSB 14606-2001 and YSB 14607-2001). The found results were consistent with the certified values. The relative errors were between 0.25% and 7.14%.
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PI Ye-hua,FENG Zhao-jun. Determination of major and minor elements in deoxidizing agent for steel making by alkali fusion-inductively coupled plasma optical emission spectrometry. , 2017, 37(5): 34-40.
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