Abstract：The sample was boiled in glacial acetic acid (1+4) for 2-3min. After rinsing the surface using anhydrous ethanol followed by drying, the sample was wrapped with ultra-high purity nickel basket as the flux. The determination of oxygen and nitrogen in copper-chromium alloy by inert gas fusion infrared absorption-thermal conductivity method was realized. In order to guarantee the consistent release rate of oxygen and nitrogen in sample, the metallic chromium which was matched with the sample matrix was selected as the calibration substance to establish the calibration curve. The correlation coefficients of calibration curves for oxygen and nitrogen were 0.9937 and 0.9936, respectively. The low limit of determination for oxygen and nitrogen was 0.0019% and 0.00012%, respectively. The precision of experimental method was investigated, and the relative standard deviations (RSD, n=11) of determination results were 3.4%-3.6% and 5.0%-5.9%, respectively. The experimental method was applied for the analysis of copper-chromium alloy samples. The control sample of metallic chromium GSB (2016-4) was added for recovery test. The results showed that the recoveries of oxygen and nitrogen were 98%-103% and 96%-104%, respectively.
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LIN Fei, WANG Peng, LI Chao, LI Dong-ling, ZHAO Lei. Determination of oxygen and nitrogen in copper-chromium alloy by inert gas fusion infrared absorption-thermal conductivity method. , 2018, 38(7): 38-43.
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