直流电弧原子发射光谱法测定铌及铌合金中镉含量

Determination of Cadmium in Niobium and Niobium Alloy by Direct Current Arc Atomic Emission Spectrometry

采用直流电弧原子发射光谱法测定铌及铌合金中镉含量。实验优化了仪器工作条件,选用纯氧化镉做光斑,226.502 nm作为镉的分析线、样品与缓冲剂的比例为2比1。结果表明,本方法 Cd元素检出限为0.84μg/g,加标回收率在94.7%~108.7%之间,测定值的相对标准偏差(n=11)均小于10%,具有很好的准确度和精度。

DC arc atomic emission spectrometry was adopted to determine cadmium content in niobium and niobium alloy with pure cadmium oxide as the spot,cadmium 226. 502 nm the analysis line and the ration of sample to buffer 2 to 1. Results showed that by this method,the dection limit was 0. 84 μg/g,the recovery rate was between 94. 7% ~ 108. 7%,and the relative standard deviation（ n = 11） was lower than 10%,presenting high accuracy and precision.