Abstract：The content of iron, copper, cadmium, antimony, lead, tin and arsenic in high-purity zinc was very low, and the matrix and polyatomic ion interference was serious. As a result, the direct determination of those seven elements after sample dissolution by inductively coupled plasma mass spectrometry (ICP-MS) was difficult. The experiment showed that 0.100 0 g of sample was dissolved at low temperature with 15 mL of nitric acid (1+2). The mass spectrometry interference was avoided by optimizing the instrumental parameters and selecting proper isotopes, and the matrix effect was eliminated by plotting calibration curve with standard addition method. Thus, the determination of seven trace elements (including iron, copper, cadmium, antimony, lead, tin and arsenic) in high-purity zinc could be realized by inductively coupled plasma mass spectrometry(ICP-MS) without matrix separation. The correlation coefficients of calibration curves of elements were between 0.995 8 and 0.999 7. The detection limit of method was 0.05-7.53 μg/L. The content of iron, copper, cadmium, antimony, lead, tin and arsenic in actual high-purity zinc sample was determined by proposed method. The relative standard deviation(RSD, n=11) of the results were between 2.4% and 5.3%, and the recoveries were between 96% and 109%. The proposed method was applied to determination of seven trace elements in pure zinc sample. The results of arsenic were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry(ICP-AES). The results of tin and antimony were basically consistent with those obtained by atomic fluorescence spectrometry(AFS). The results of iron, copper, cadmium and lead were basically consistent with those obtained by ICP-MS after separation of zinc matrix.
葛晶晶,刘洁. 电感耦合等离子体质谱法测定高纯锌中7种痕量元素[J]. 冶金分析, 2016, 36(9): 37-41.
GE Jing-jing,LIU Jie. Determination of seven trace elements in high purity zinc by inductively coupled plasma mass spectrometry. , 2016, 36(9): 37-41.
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