Precious Ce Isotope Analysis of Rock Samples by TIMS Method
YANG Hong-mei
LING Wen-li
DUAN Gui-ling
Abstract：A high-precision analysis method of La-Ce isotope ratios for rock samples using TIMS is reported Separation and purification of La and Ce from matrix elements is carried out using arHIBA ion exchange procedure. Ce Isotope ratios and La. Ce contents are measured by the mass spectrometry of Triton. A long-term analysis result of standard JMC304 gives a weighted ~(138)Ce/~(142)Ce ratio 0. 022 576 2±0. 000 001 5, which agrees well with the reference values from the literatures. Using the method reported in this study, the Ce isotope ratios and La, Ce contents are analyzed for USGS basalt reference material BCR-2 and an alkali basalt from the Emeishan terraia The ~(138)Ce/~(142)Ce ratios of BCR-2 and Emeishan basalt (EQB) are 0. 022 557 2±0. 000 001 0 and 0. 022 575 5±0. 000 000 3 with corresponding La contents of 25. 2±0. 3 and 55. 8±0. 9 μg/g, and Ce contents of 54. 2±2. 4 and 117. 4±1. 3 μg/g, respectively. It shows that the measured La and Ce contents by isotopic dilution of BCR-2 agree with their certificate values within the analysis error, and this is the first report of Ce isotope for both the standards, which displays a precision range of 0. 001% to 0. 005%. In addition, a weighted average ~(140)Ce/~(142)Ce ratio of 7. 943 9±0. 000 2 is obtained based on 105 analyses, which is likely the representative of a best estimated value for the ratio.
Keywords：Ce isotopic ratiohigh-precision analysisTriton mass spectrometryreference materialsgeochemistry.
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 939-945 )