萃取分离-电感耦合等离子体质谱法测定高纯铝中的杂质元素

采用APDC-MIBK萃取分离铝，电感耦合等离子体质谱(ICP-MS)法同时测定高纯铝中Co，Ni，Cu，Mo，Cd，Pb和Bi。详细地讨论了仪器工作参数，内标元素，分离、富集条件，样品基体的干扰，确定了实验的最佳测定条件。结果表明，方法的检出限为0.011～0.052 μg·L-1,回收率为92.2%～103.0%，相对标准偏差(RSD)小于2.3%。方法准确、快速、简便，应用于高纯铝中Co，Ni，Cu，Mo，Cd，Pb和Bi等杂质元素的测定，结果满意。

Determination of Impurity Elements in High-Purity Aluminium Using Inductively Coupled Plasma-Mass Spectrometry after Matrix Extraction and Separation

To establish the method for the determination of 7 trace impurity elements including Co, Ni, Cu, Mo, Cd, Pb and Bi in high-purity aluminium by inductively coupled plasma-mass spectrometry (ICP-MS), the impurity elements were extracted from the aluminium matrix in the form of chelates with ammonium pyrrolidine dithiocarbamate (APDC) into methyl isobutylketone (MIBK). The instrument parameters, and conditions of separation and interference of matrix were discussed in detail. The optimal detection conditions were determined. The detection limits range from 0. 011 to 0. 052 microg x L(-1) depending on the elements, recoveries of samples are in the range of 92. 2%-103. 0%, and the precision is RSD<2. 3%. This method is accurate, quick and convenient. It is used in the determination of impurity elements in high-purity aluminium with satisfactory results.