Determination of nitrogen in aluminum-calcium complex deoxidizer by inert gas fusion-thermal conductivity method
The rapid and accurate determination of nitrogen in aluminum-calcium complex deoxidizer has im-portant 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 deoxi-dizer 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％.
inert gas fusionthermal conductivity methodaluminum-calcium complex deoxidizernitrogen
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