Citation: MO Shu-Min, ZHU Li-Hong, LI Ai-Chang, LI Na, CHEN Xiong-Fei. Determination of Gold, Sodium, Potassium and Calcium in Lithium Tantalate by Inductively Coupled Plasma-Tandem Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(2): 246-252. doi: 10.19756/j.issn.0253-3820.201404 shu

Determination of Gold, Sodium, Potassium and Calcium in Lithium Tantalate by Inductively Coupled Plasma-Tandem Mass Spectrometry

Guobiao(Beijing) Testing & Certification Co., Ltd., Beijing 100088, China

Corresponding author: MO Shu-Min, msmustb@126.com
Received Date: 11 July 2020
Revised Date: 13 December 2020

Fund Project: Supported by the Ministry of Industry and Information Technology (National New Material Testing and Evaluation Platform-Main Center Project) (No.52801).

The interferences of gold, sodium, potassium and calcium are serious in the determination of lithium tantalate by conventional quadrupole inductively coupled plasma mass spectrometry (ICP-QMS), especially for gold. In this study, the methods for determination of gold, sodium, potassium and calcium in lithium tantalate by inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) were developed. The reaction principles were studied and the determination parameters were optimized. ¹³³Cs was selected as internal standard to compensate matrix effect. Au could be detected at m/z=197 under on-mass mode with 0.9 mL/min O₂ as reaction gas, or detected at m/z=231 as Au(NH₃)₂⁺ cluster ion under mass-shift mode with 6.5 mL/min NH₃/He mixture as reaction gas. There was no significant difference between the detection results of Na under O₂ or NH₃ on-mass mode, which verified that the interference of LiO was negligible. The detection limits of Au, Na, K and Ca were 0.006-0.11 μg/g. The relative standard deviations (RSDs, n=7) of sample detection results were less than 10%, and the recoveries were 86.3%-106.5%.
- Lithium tantalite,
- Inductively coupled plasma-tandem mass spectrometry,
- Gold,
- On-mass,
- Mass-shift
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