High-precision analysis of Pb isotope ratios using MC-ICP-MS and the Pb isotope compositions of rock standard samples

LU Shansong; TONG Xirun; TAN Juanjuan; QIU Xiaofei; YANG Hongmei

doi:10.12097/j.issn.1671-2552.2023.09.008

2023 Vol. 42, No. 9

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LU Shansong, TONG Xirun, TAN Juanjuan, QIU Xiaofei, YANG Hongmei. 2023. High-precision analysis of Pb isotope ratios using MC-ICP-MS and the Pb isotope compositions of rock standard samples. Geological Bulletin of China, 42(9): 1516-1530. doi: 10.12097/j.issn.1671-2552.2023.09.008

Citation:

LU Shansong, TONG Xirun, TAN Juanjuan, QIU Xiaofei, YANG Hongmei. 2023. High-precision analysis of Pb isotope ratios using MC-ICP-MS and the Pb isotope compositions of rock standard samples. Geological Bulletin of China, 42(9): 1516-1530. doi: 10.12097/j.issn.1671-2552.2023.09.008

High-precision analysis of Pb isotope ratios using MC-ICP-MS and the Pb isotope compositions of rock standard samples

1.
Wuhan Center, China Geological Survey(Geosciences Innovation Center of Central South China), Wuhan 430205, Hubei, China
2.
Hubei Key Laboratory of Paleontology and Geological Environment Evolution, Wuhan 430205, Hubei, China
3.
Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey, Wuhan 430205, Hubei, China

Received Date: 10 January 2022

Revised Date: 10 June 2022

Publish Date: 15 September 2023

Abstract

Abstract

A method for high-precision analysis of Pb isotope using MC-ICP-MS(Neptune plus) was established in Wuhan Centre, China Geological Survey.This study has focused on the influence of Tl standard solution of various concentration on the test results of Pb isotope ratio, and the optimal concentration of Tl standard solution has been determined to be 25 ng/mL, and the Pb concentration in the sample solution should be higher than 25 ng/mL(i.e.the Pb/Tl concentration ratio should be higher than 1).The Pb isotope reference material SRM 981 has been tested with this method for 11 months(July 2020~June 2021).The isotope ratios for SRM 981 are ²⁰⁶Pb/²⁰⁴Pb=16.9415±0.0010, ²⁰⁷Pb/²⁰⁴Pb=15.4985±0.0009 and ²⁰⁸Pb/²⁰⁴Pb=36.7204±0.0023, which are identical to the published data.The blank of long-term monitoring is less than 0.25 ng, which can meet the needs of high-precision lead isotope ratio test of geological samples.Meanwhile, we determined the Pb isotope composition of four trace element standard samples(BCR-2、AGV-2、BHVO-2 and BIR-1a) by using the same procedure.The results are consistent with the published data, hence this method is accurate and reliable.
- Pb isotope /
- MC-ICP-MS /
- USGS reference materials /
- rock standard samples

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References

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