Determination of trace impurity elements in high purity metal silver by inductively coupled plasma mass spectrometry
TIAN Kan,SUN Zi-jie*,ZHOU Yu-min,FENG Yue-peng
Institute for Environmental Reference Materials of Ministry of Environmental Protection, State Environmental Protection Key Laboratory of Environmental Pollutant Metrology and Reference Materials, Beijing 100029, China
Abstract：During the purity analysis of high purity metals, the matrix separation method is usually adopted to eliminate the influence of matrix effect for determination of trace impurity elements. However, the pretreatment process is complex and the sample is easily polluted. After the sample was dissolved with nitric acid (1+1), the types of impurities in high purity silver were semi-quantitatively determined by inductively coupled plasma mass spectrometry (ICP-MS). Then, the mass spectrometry interference was overcome by selecting proper isotopes, and the calibration curves were prepared by standard addition method. Consequently, the influence of matrix effect of silver in determination of trace impurity elements could be eliminated without matrix separation, realizing the direct quantitative determination of eight trace metallic impurities (including lead, arsenic, copper, nickel, antimony, tin, palladium and bismuth) in high purity metal silver by ICP-MS. Moreover, after the determination of eight trace impurity elements in high purity metal silver by ICP-MS, the purity of silver could be calculated by subtraction method according to national standard method GB/T 21198.5-2007. The detection limit of method was 0.09-1.1 μg/L. The proposed method was applied to the analysis of high purity metal silver actual samples. The recoveries of standard addition were between 96% and 106%. The relative standard deviations (RSD, n=6) were not more than 5.0%.
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TIAN Kan,SUN Zi-jie,ZHOU Yu-min,FENG Yue-peng. Determination of trace impurity elements in high purity metal silver by inductively coupled plasma mass spectrometry. , 2016, 36(7): 51-55.
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