A method to detect the oxygen and nitrogen contents in Ag - Cu alloy was established with measuring ranges of 0.0005％ ～0.02％ for oxygen and 0.0001％ ～0.02％ for nitrogen. Using a oxygen -nitrogen analyzer with helium as the carrier gas, the sample was melt down in a heated graphite crucible. CO and CO2 were generated by oxygen and carbon and CO was catalytically oxydized to CO2 by rare earth -copper oxide. The CO2 absorption peak was measured in the infrared detection pool. Nitrogen was turned into N2 gas and was loaded into the thermal conductivity cell by helium gas to detect the heat conductivity. Mass fractions of oxygen and nitrogen were then calculated by the computer. In the samples,the relative standard deviations( RSD, n = 7)of 0. 0026％ and 0. 0075％ oxygen were separately 10.6％ and 3.9％, with 100.5％ and 100.9％ of the standard addition recoveries. The relative standard deviations (RSD,n =7)of 0. 00075％ and 0. 00013％ nitrogen were separately 15.0％ and 15.2％ with 85.2％ and 85.9％ of the standard addition recoveries. The process is simple, convinient and timesaving. After putting into use in the analysis work of the practical samples, the experimental results are satisfactory.%建立了银铜合金中氧和氮含量的测定方法,测定范围为氧0.0005%～0.02%,氮0.0001%～0.02%.采用氧氮分析仪测定,以氦气为载气,样品在加热的石墨坩埚中熔融,氧与碳生成CO和CO2,CO被稀土氧化铜催化氧化成CO2,进入红外检测池测定CO2吸收峰,氮以氮气形态进入热导池测定热导率的变化,计算机换算出氧和氮的质量分数.样品中0.0026%、0.0075%的氧的相对标准偏差(RSD,n=7)分别为10.6%和3.9%,加标回收率为100.5%和100.9%;0.00075%、0.00013%的氮的RSD(n=7)分别为15.0%和15.2%,加标回收率为85.2%和85.9%.方法简便快速.已用于实际样品分析工作,结果满意.
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