Citation: LIU Wen-Gang, LI Zhi-Dan, WEI Shuang, CHEN Ji, LIU Yu, AO Cong, XIAO Zhi-Bin, ZHOU Hong-Ying, LIU Hui. Rapid Separation and Precise Determination of Strontium Isotopic from Geological Samples with High Rubidium/Strontium Ratios[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(7): 1054-1060. doi: 10.19756/j.issn.0253-3820.191070 shu

Rapid Separation and Precise Determination of Strontium Isotopic from Geological Samples with High Rubidium/Strontium Ratios

LIU Wen-Gang ^1, ,
LI Zhi-Dan ¹ ,
WEI Shuang ¹ ,
CHEN Ji ² ,
LIU Yu ² ,
AO Cong ¹ ,
XIAO Zhi-Bin ¹ ,
ZHOU Hong-Ying ¹ ,
LIU Hui ¹

1.
Tianjin Center, China Geological Survey, Tianjin 300170, China;
2.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received Date: 31 January 2019
Revised Date: 1 April 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 41602200, 41873066, 41502082).

When strontium (Sr) isotopic analysis is carried out for geological samples of high rubidium (Rb)/Sr ratios, it is difficult to completely remove the isobaric interference of Rb on Sr isotopic analysis by using traditional strong acid cation exchange resin for a single separation and purification. Actually, one purification procedure performed twice is necessary to eliminate the interference of ⁸⁷Rb on the testing of ⁸⁷Sr/⁸⁶Sr. Although the purification procedure could ensure a good effect on the separation and purification of Sr, the process is tedious and time-consuming, which is not suitable for simultaneous separation and purification of Sr from large quantity of geological samples with high Rb/Sr ratios. In this study, the conventional twice separation process was optimized, and an experimental method for rapid separation of Sr from geological samples with high Rb/Sr ratios was established. The Sr solution after purified by AG50 resin was added to a new AG50 resin directly to purify Rb and Sr again. The whole separation process would be accomplished quickly and efficiently. The method combined with high sensitive thermal ionization mass spectrometry (TIMS) is completely satisfied to high precision determination of ⁸⁷Sr/⁸⁶Sr isotope ratios for the samples of high Rb/Sr ratios. Through the application of the new separation method with a large number of geological samples of high Rb/Sr ratios, it is proved that the experimental process is stable and reliable and showing crucial application value.
- Geological samples,
- High rubidium/strontium ratio,
- Continuous separation,
- Cation exchange resin,
- ⁸⁷Sr/⁸⁶Sr isotope ratio
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