Rapid Separation and Precise Determination of Strontium Isotopic from Geological Samples with High Rubidium/Strontium Ratios
Rapid Separation and Precise Determination of Strontium Isotopic from Geological Samples with High Rubidium/Strontium Ratios
复制标题
高铷/锶比地质样品中锶同位素的快速分离和精确测定
DOI：
10.1016/s1872-2040(19)61172-2
复制
发表时间：
2019-07-01
影响因子：
1.2
通讯作者：
Liu Hui
中科院分区：
文献类型：
--
作者：
Liu Wen-Gang;Li Zhi-Dan;Liu Hui
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 Rb-87 on the testing of Sr-87/Sr-86. 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 Sr-87/Sr-86 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.
