Abstract：A method for simultaneous determination of oxygen and nitrogen in the synthetic diamond was established by inert gas fusion-pulse heating method with 0.067-0.12 g of sample , 0.37 g of nickel fluxing agent, analysis power of 5.5 kW, and discussion was conducted on the calibration curve of oxygen and nitrogen. Oxygen and nitrogen in the synthetic diamond were tested nine times with relative standard deviation (RSD, n=9) less than 3.0% and 3.5%, respectively. The two calibration curves drawn by different oxygen and nitrogen certified reference materials were applied to the determination of oxygen and nitrogen in synthetic diamond samples, the results were identical, and they were also consistent with those obtained by inert gas high temperature extraction-pulse heating method.
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