Abstract：High-purity chromium is an additive for iron and steel, and contents of impurities are related to the performance of iron and steel materials. Therefore, it is very important to determine the content of impurity elements efficiently and accurately. In experiments, the high purity chromium powder with particle size of 150μm was pressed into pieces, and a method for the determination of 68 impurity elements (such as Na, Mg, Al and Si) in high purity chromium by glow discharge mass spectrometry (GD-MS) was established. The results showed that the discharge signal of chromium piece was stable and the intensity could meet the test requirements by optimizing the working conditions of the instrument. The mass specal interference could be eliminated by determining K, Zn, Ga, Ge, Se, Mo, Ru, Rh, Pd, Ag and Sn at high resolution mode, while determining other elements at medium resolution mode. 13 elements such as Na, Al, Si, P and S were determined by relative sensitivity factor (RSF) after correction, while other elements were determined using standard RSF. The limits of detection were between 0.001μg/g and 0.50μg/g. The contents of impurity elements in two high purity chromium samples were determined according to the experimental method. The found results of 56 common elements were consistent with those obtained by inductively coupled plasma mass spectroscopy (ICP-MS), inductively coupled plasma atomic emission spectrometry (ICP-AES), atomic absorption spectrometry (AAS), atomic fluorescence spectrometry (AFS) and infrared absorption (IR). The determination results of other 12 elements were also consistent with the semi-quantitative reference values obtained by ICP-MS.
邵秋文, 胡净宇, 侯艳霞, 杨国武. 辉光放电质谱法测定高纯铬中杂质元素[J]. 冶金分析, 2020, 40(9): 10-17.
SHAO Qiu-wen, HU Jing-yu, HOU Yan-xia, YANG Guo-wu. Determination of impurity elements in high purity chromium by glow discharge mass spectrometry. , 2020, 40(9): 10-17.
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