Citation: WEI Shuang, AO Cong, LIU Yu, LIU Wen-Gang, LIU Fu-Tian, CHEN Yin, ZHANG Jian, ZHOU Hong-Ying, WANG Li-Qiang. Rapid Separation of Strontium from Geological Samples with High Rubidium/Strontium Ratios by Coprecipitation and Precise Determination of Strontium Isotopic[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(1): 97-103. doi: 10.19756/j.issn.0253-3820.191398 shu

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

WEI Shuang ^1,2, ,
AO Cong ^1,2 ,
LIU Yu ³ ,
LIU Wen-Gang ^1,2 ,
LIU Fu-Tian ¹ ,
CHEN Yin ^1,2 ,
ZHANG Jian ^1,2 ,
ZHOU Hong-Ying ^1,2 ,
WANG Li-Qiang ^1,2

1.
Tianjin Center, China Geological Survey, Tianjin 300170, China;
2.
Key Laboratory of Uranium Geology, China Geological Survey, Tianjin 300170, China;
3.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received Date: 13 July 2019
Revised Date: 16 November 2019

Fund Project: This work was supported by the Geological Survey of China (Nos. DD20190338, DD20190119-06) and the National Natural Science Foundation of China (No. 41873066).

In analysis of strontium (Sr) isotope in geological samples with high rubidium (Rb)/Sr ratios, a large number of matrix elements (Na, K, etc.) and isobaric interference of Rb on Sr isotopic analysis were effectively removed by coprecipitation method using NaOH. The influence of reaction temperature, reaction time and alkali concentration were investigated, and the optimum reaction conditions were determined finally. The results showed that the removal rate of Rb, Na, K, Al was over 99% and the recovery of Sr was better than 96% by coprecipitation for 1 h using 2 mL of NaOH with a mass-to-volume ratio of 5% at 100℃. After coprecipitation, high purity Sr was obtained by a single separation and purification using AG50W×12 cation exchange resin. NaOH (99.99%) without adding excess matrix elements and the total procedure blanks of Sr was less than 182 pg. With this method, Sr isotope was separated from eight standard rock samples with different Rb/Sr ratios (JR-2, BCR-2, BHVO-2, W-2, AGV-2, JG-3, JA-3, GSP-2), and then high precision determination of Sr isotope ratios was obtained by highly sensitive thermal ionization mass spectrometer (TIMS). The result showed that the coprecipitation-cation exchange resin separation process had many advantages such as wide application range, stability and reliability, low consumption of inorganic acids and short reaction time. Preconcentration of Sr by the coprecipitation method provided a new separation way for Sr isotope determination in geological samples with high Rb/Sr ratios, showing an important application value.
- Geological samples,
- High rubidium/strontium ratio,
- Coprecipitation method,
- Cation exchange resin,
- Strontium isotope
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