Determination of nitrogen in aluminum-calcium complex deoxidizer by inert gas fusion-thermal conductivity method
GE Qingfeng1, ZHOU Guihai2
1. Manufacturing Management Department,Shanghai Meishan Iron and Steel Co.,Ltd.,Nanjing 210039,China; 2. Technology Center,Shanghai Meishan Iron and Steel Co.,Ltd.,Nanjing 210039,China
Abstract：The rapid and accurate determination of nitrogen in aluminum-calcium complex deoxidizer has important guiding significance for the deoxygenation in steelmaking. 0.200 0 g of sample was mixed with 0.4 g of nickel as the flux. The analytical power was set at 5.5 kW. The calibration curve was prepared with nitrogen standard solution series. Thus, a method for determination of nitrogen in aluminum-calcium complex deoxidizer was established by inert gas fusion-thermal conductivity. The experimental results showed that the nitrogen mass in range of 100.0-1 000.0 μg had a linear relationship with its corresponding peak area. The linear correlation coefficient was 0.999 2. The limit of detection of this method was 0.000 3%, and the limit of quantification was 0.001%. The contents of nitrogen in aluminum-calcium complex deoxidizer samples were determined according to the proposed method, and the relative standard deviations (RSD, n=9) of determination results were between 1.4% and 3.3%. Nitrogen standard solutions were added respectively into aluminum-calcium complex deoxidizer samples for recovery tests according to the proposed method. The recoveries were between 96% and 103%.
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