首页|Precise and accurate Ga isotope ratio measurements of geological samples by multi-collector inductively coupled plasma mass spectrometry

Precise and accurate Ga isotope ratio measurements of geological samples by multi-collector inductively coupled plasma mass spectrometry

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Precise and accurate Ga isotope ratio measurements of geological samples by multi-collector inductively coupled plasma mass spectrometry
Gallium isotope is a potential geochemical tool for understanding planetary processes,environmental pol-lution,and ore deposit formation.The reported Ga isotope compositions(δ71GaNIST994 values)of some international geological standards,such as BCR-2 and BHVO-2 basalts,exhibit inconsistencies between different laboratories.Dur-ing mass spectrometry analysis,we found that δ71GaNIST994 values of geological standards with or without the correc-tion of the interference of 138Ba2+(mass/charge ratio=69)on 69Ga show significant isotope offsets,and thus efficient separation of Ba and correcting the interference of 138Ba2+are both crucial to obtain accurate δ71Ga values.By com-paring δ71GaNIST994 values(relative to NIST SRM 994 Ga)of the same geostandards from different laboratories,we suggest that the isotopic heterogeneity from NIST SRM 994 Ga is one of the key reasons for the inconsistencies inδ71GaNIST994 values of BCR-2 and BHVO-2.To facilitate inter-laboratory comparisons,we measured the Ga isotopic compositions of 11 geological reference materials(includ-ing Pb-Zn ore,bauxite,igneous rocks,and loess)and two Ga solution standards(NIST SRM 3119a and Alfa Aesar).The 871GaNIST994 and δ71GaIPGP values of these reference materials vary from 1.12 ‰ to 2.63 ‰ and-0.13 ‰ to 1.38‰,respectively,and can be used to evaluate the precision and accuracy of Ga isotope data from different laboratories.

Ga isotopesMC-ICP-MSReference materialsChemical purificationBa interference

Yuxu Zhang、Pan Qiao、Chuanwei Zhu、Haifeng Fan、Hanjie Wen

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State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,99 West Lincheng Road,Guiyang 550081,Guizhou Province,China

College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101408,China

School of Earth Sciences and Resources,Chang'an University,126 Yanta Road,Xi'an 710054,Shaanxi Province,China

College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

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Ga isotopes MC-ICP-MS Reference materials Chemical purification Ba interference

2024

10.1007/s11631-024-00729-8

地球化学学报(英文版)
中国科学院地球化学研究所

地球化学学报(英文版)

EI
影响因子：0.33
ISSN：2096-0956
年,卷(期)：2024.43(6)