Simultaneous Determination of Nitrogen and Hydrogen in Anthracite by Inert Gas Melting-Infrared Absorption/Thermal Conductivity Method

The contents of nitrogen and hydrogen in anthracite were simultaneously, rapidly and accurately determined by the inert gas melting-infrared absorption/thermal conductivity method. A series of experiments were studied. The results indicated that the most complete and reasonable release of nitrogen and hydrogen was achieved when the sample was 0.030 0 g, the analysis power was 5 500 W, the integration delay time of nitrogen was 15 s, the integration time of nitrogen was 55 s, the integration delay time of hydrogen was 5 s, the integration time of hydrogen was 85 s, and the graphite sleeve crucible was used. The correlation coefficients of calibration curves of nitrogen and hydrogen were 0.994 9 and 0.994 0, respectively. The limits of detection were 0.321% and 0.189%, the limits of quantification were 0.326% and 0.194%, and the precision were 3.60% and 0.63%, respectively, which met the requirements of linearity and method. The inert gas melting-infrared absorption/thermal conductivity method is reproducible, efficient and convenient, easy to operate and maintain, and can be used for the quantitative determination of nitrogen and hydrogen in anthracite.