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Accurate Determination of Lithium Isotopic Compositions in Geological Samples by Multi-collector Inductively Coupled Plasma-Mass Spectrometry
ZHANG Jun-Wen;  MENG Jun-Lun;  ZHAO Zhi-Qi;  LIU Cong-Qiang
2019
Source PublicationChinese Journal of Analytical Chemistry
Volume47Issue:3Pages:415-422
Abstract

Accurate determination of lithium (Li)isotopic composition in natural geological samples is the basis for Li isotope geochemical studies. In this study, a method contained preparation of geological materials (water and rock) and accurate determination of Li isotopic composition was set up. The separation of Li from water and rock samples was implemented by a single column containing 1.5 mL of Bio-Rad AG 50W-X12 (200–400 mesh) resin, with 0.40 M HCl and 1.0 M HCl as eluents. Only 8.5 and 14 mL of eluents were used to separate Li from water and rock samples with this method, respectively. Blank signal of the operation procedure was (2.4 ± 0.1) mV, which was almost same as the 2.3 mV of the 2% HNO3 signal used in this study. Experimental results showed that Li isotopic fractionation during leaching process was significant and deviation of δ7Li values in these samples with incompletely recovered Li reached up to 50‰. Lithium isotopic ratios were determined by multi-collector ICP-MS (Nu Plasma II) using the sample standard bracketing (SSB) method. L-SVEC standard with similar Li concentration to samples (about 80 ng mL−1) was used in this study. The external precision (2σ) of this technique, determined by repeated measurement of pure Li standard solutions and seawater was < ±0.8‰. The measured δ7Li values of seawater and rock standards AGV-2, BCR-2 and GSP-2 were +31.4‰ ± 0.7‰ (n = 18), +7.23‰ ± 0.16‰ (n = 4), +3.7‰ ± 0.7‰ (n = 8) and −0.10‰ ± 0.18‰ (n = 4), respectively, similar to previously published values. This method could be used to accurately determine Li isotopic composition of various types of geological samples such as waters and rocks. The advantage of this method was that the amount of resin and reagent was reduced to 50% or less of the previous studies, thereby significantly improving the work efficiency and reducing the operation procedure blank.

KeywordLithium Isotopic Composition multi-collector Inductively Coupled Plasma Mass spectrometry Lithium Isotopic Fractionation
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10391
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.School of Environmental Studies, China University of Geosciences, Wuhan 430071, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
Recommended Citation
GB/T 7714
ZHANG Jun-Wen;MENG Jun-Lun;ZHAO Zhi-Qi;LIU Cong-Qiang. Accurate Determination of Lithium Isotopic Compositions in Geological Samples by Multi-collector Inductively Coupled Plasma-Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry,2019,47(3):415-422.
APA ZHANG Jun-Wen;MENG Jun-Lun;ZHAO Zhi-Qi;LIU Cong-Qiang.(2019).Accurate Determination of Lithium Isotopic Compositions in Geological Samples by Multi-collector Inductively Coupled Plasma-Mass Spectrometry.Chinese Journal of Analytical Chemistry,47(3),415-422.
MLA ZHANG Jun-Wen;MENG Jun-Lun;ZHAO Zhi-Qi;LIU Cong-Qiang."Accurate Determination of Lithium Isotopic Compositions in Geological Samples by Multi-collector Inductively Coupled Plasma-Mass Spectrometry".Chinese Journal of Analytical Chemistry 47.3(2019):415-422.
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