【作者】 周国庆； 朱凤蓉； 李梅； 俞江； 董宏波； 万可友；

【Author】 ZHOU Guo-qing, ZHU Feng-rong , LI Mei, YU Jiang, DONG Hong-bo, WAN Ke-you (Northwest Institute of Nuclear Technology, Xi’an 710024, China)

【机构】 西北核技术研究所；

【摘要】 <正> 在有同质异位素干扰的情况下,通常从所测质谱峰中直接扣除叠加的同质异位素峰,获得同位素丰度比。这种方法适用于干扰元素存在两个以上的同位素,需丰度比已知。本工作拟已Yb存在的情况下测定¹⁷⁶Lu/¹⁷⁵Lu的同位素比值为例(存在¹⁷⁶Yb对¹⁷⁶Lu的干扰),探讨在有同质异位素干扰下用ICP-MS测定同位素比的方法。更多还原

【Abstract】 In this paper, Interferential Additions Calibration （IAC） which can be used to measure isotope abundance ratio by inductively coupled plasma-mass spectrometry （ICPMS） in the presence of isobaric interference was illustrated. In this method, it is only required that the isotope ratios of interferential element added to the sample must be the same as the analyte, and moreover, their accurate values must not be required. Compared with direct calibration, the IAC has more advantages in terms of practicability. Especially, the IAC can be used to remove the spectral interference caused by the tailing of strong peak or combined-ion. As an example, this method was be used to determine the abundance ratio of ¹⁷⁶Lu and ¹⁷⁵Lu in the presence of isobar Yb. The result met well with certificated value.更多还原