石墨炉原子吸收光谱法测定高纯镍中痕量杂质铅和锡

Direct determination of trace elements lead and tin in high purity nickel by GFAAS

利用石墨炉原子吸收法 ,在等温平台条件下直接测定了高纯镍中的痕量杂质铅和锡。对石墨炉加热程序中的干燥时间、灰化温度及原子化温度进行了优化 ,同时也考察了介质酸度的影响。试验表明 :基体镍对测定有显著的影响 ,为此对工作曲线用的标准系列进行了基体匹配。基体镍同时在测定中也起着基体改进剂的作用。在本方法中 ,铅和锡的特征质量分别为 4 4pg和 3 3pg ,相对标准偏差分别为 3 2 %和 3 7% ,加标回收率分别为 99 3 %～ 10 4%和 96 1%～ 10 3 %。

The determination of trace lead and tin in high purity nickel by GFAAS in STPF conditions is described in this paperThe dry time, ash temperature and atomization temperature were obtained by optimization processThe standard series for working curve are matched to eliminate the influences of matrix nickel,and nickel is also as the chemical matrix modifier in the determinationThe characteristic masses for Pb and Sn are 44pg and 33pg respectively,the relative standard deviations for Pb and Sn are 32% and 37% respectively,and the recoveries for Pb and Sn are in the ranges 993%-104% and 961%-103% respectively