直流电弧发射光谱法测定铌及铌合金中钽含量

采用直流电弧光谱仪对铌及铌合金中钽元素进行检测。通过试验确定满足分析条件的缓冲剂、样品与缓冲剂的配比及钽元素谱线并检测其精密度、准确度及检出限。结果表明,选择Li2CO3与碳粉1∶6混合作为缓冲剂,缓冲剂与样品比例为1∶2,钽元素的谱线为271.013 nm;加标回收率为94%~109%,测定值的相对标准偏差(测10次)均小于10%。

Determination of Tantalum Content in Niobium and Niobium Alloys by DC Arc Spectrometry

The tantalum in niobium and niobium alloys was determined by Prodigy DC arc spectrometer.The exciting current,buffer,sample to buffer ratio and tantalum element spectral line were determined by experiments.The precision,accuracy and detection limit of tantalum of this method were also determined.Resuts showed that the buffer was the blend of LiCO3 and C powder with the ratio of 1 to 6,the ratio of buffer to sample was 1 to 2,and 271.073 nm was chosen to be the spectral line of Ta;the recovery was 94％ ～ 109％ and the relative standard deviations of the 10 measured values were lower than 10％.