Abstract：Oxygen and nitrogen in zirconium alloy is singly determined in most methods, so the operation is very complicated. The simultaneous determination of oxygen and nitrogen in zirconium alloy was proposed. 0.06 g of zirconium alloy sample was put into nickel basket, which was then transferred into graphite duplex crucible.The analytical power was controlled at 5.0 kW. The integral time for oxygen and nitrogen was 40 s and 60 s, respectively. The calibration curve was established using zirconium alloy standard sample AR640, realizing the simultaneous determination of oxygen and nitrogen in zirconium alloy by inert gas fusion-infrared and thermal conductivity method. The low limit of determination for oxygen and nitrogen was 0.000 7% and 0.000 2%, respectively. The proposed method was applied to the determination of oxygen and nitrogen in two actual zirconium alloys. The relative standard deviations (RSD, n=11) for oxygen and nitrogen were 1.5%-4.4% and 7.6%-8.6%, respectively. The content of oxygen and nitrogen in zirconium alloy standard sample BCR-276 was determined according to the experimental method, and the found results were basically consistent with the certified values.
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