Determination of aluminium and silicon in iron-silicon-aluminium magnetic core by inductively coupled plasma atomic emission spectrometry with microwave digestion
1. Center of Chemical Analysis, University of Science and Technology Beijing, Beijing 100083, China; 2. Central Iron & Steel Research Institute, Beijing 100094, China
Abstract：The sample was treated in hydrochloric acid-nitric acid-hydrofluoric acid system by microwave digestion method. Al 308.215 nm and Si 212.412 nm were selected as the analytical lines. The standard solution series were prepared by matrix matching method to plot the calibration curve. The contents of aluminum and silicon were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Consequently, a determination method of aluminum and silicon in iron-silicon-aluminum magnetic core was established by ICP-AES with microwave digestion. The results showed that the mass fraction of aluminum and silicon in range of 1.00%-9.00% and 2.50%-12.50% were linear to their corresponding emission intensity, respectively. The linear correlation coefficients were not lower than 0.999 4. The detection limit of aluminum and silicon was 0.020% and 0.021% (mass fraction), respectively. The proposed method was applied to the determination of aluminum and silicon in iron-silicon-aluminum magnetic core samples. The relative standard deviations (RSD, n=6) were between 1.4% and 2.2%. The results were consistent with those obtained by titrametry (for aluminum) and gravimetry (for silicon).
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