Determination of nitrogen in NiFeCr alloy by optical emission spectrometry
LIU Hui, ZHANG Chun-xiao, HU Jun，Cao Zhang，Deng Gang，Li Shi-Min
1. Advanced Technology & Materials Co., Ltd., Beijing 100081, China;
2. Central Iron and Steel Research Institute, Beijing 100081, China; 3. Spectro Analytical
Instruments GmbH of Germany, Beijing Representative Ｏffice, Beijing 100015, China
Abstract：A rapid quantitative determination of nitrogen in NiFeCr alloy with optical emission spectrometry was described. A discussion was conducted on the issues including the selection of spectral lines for determining nitrogen, the analysis condition of nitrogen, the preparation and treatment of samples, the influence of coexistent elements and the fitting of nitrogen calibration curve, etc. The method was applied to determine the nitrogen content in NiFeCr alloy samples with relative standard deviation less than 9%, and the results were consistent with those obtained by oxygen and nitrogen analyzer. The method enabled the determination of both nitrogen and alloy element in NiFeCr alloy with one excitation of the sample and met the requirement for the production of NiFeCr alloy.
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