Application of non-linear interference equivalent concentration correction in the determination of boron in low alloy steel by inductivelycoupled plasma atomic emission spectrometry
HUANG Hui1,ZHANG Shu-jun2,GONG Chen1, LI Ben-tao1,LI Ying1,ZHAO Hua1
1.The 53rd Research Institute of China North Industries Corporation, Jinan 250031, China; 2.Integrated Electronic Systemlab Co., Ltd., Jinan 250000, China
Abstract：The hydrochloric acid and nitric acid were used to digest the low alloy steel sample by microwave heating at high pressure in a closed system. The interference of common elements in low alloy steel and iron matrix with the sensitive lines of boron was investigated. B 208.959 nm was selected as the analytical line. The determination method of boron in low alloy steel by inductively coupled plasma atomic emission spectrometry (ICP-AES) with non-linear interference equivalent concentration correction was established. The calibration curve was prepared by studying the non-linear relationship between the interference equivalent concentration of boron caused by iron matrix and the mass concentration itself. In order to determine the content of iron matrix directly without dilution, Fe 218.719 nm with relatively low sensitivity was used as analytical line. Then, the calibration curve of iron was established. The interference equivalent concentration of boron caused by iron with different mass concentrations was investigated at wavelength of B 208.959 nm. The calibration curve between the mass concentration of iron and interference equivalent concentration of boron was obtained by polynomial fitting, i.e., 公式 The proposed method was applied to the determination of boron in one standard sample of stainless steel. The found results were consistent with the reference values. The relative standard deviations (RSD, n=6) were between 3.7% and 5.3%.
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