87Sr/86Sr isotope ratios in rocks determined using inductively coupled plasma tandem mass spectrometry in O2 mode without prior Sr purification

被引：11

作者：

Liu, Xiaoming ^{[1
]}

Dong, Shuofei ^{[2
]}

Yue, Yahu ^{[1
]}

Guan, Qiuyun ^{[1
,3
]}

Sun, Yali ^{[1
,4
]}

Chen, Shengsheng ^{[1
,3
,4
]}

Zhang, Jiuyuan ^{[1
]}

Yang, Yibo ^{[1
,4
]}

机构：

[1] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China

[2] Agilent Technol Co Ltd China, Beijing, Peoples R China

[3] Univ Chinese Acad Sci, Beijing, Peoples R China

[4] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China

来源：

RAPID COMMUNICATIONS IN MASS SPECTROMETRY | 2020年 / 34卷 / 08期

基金：

中国国家自然科学基金;

关键词：

STRONTIUM ISOTOPES; TRACERS;

D O I：

10.1002/rcm.8690

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

Rationale An inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) instrument can be developed to determine Sr-87/Sr-86 ratios with an external precision better than 0.05% relative standard deviation (RSD) in "mass shift" mode without prior Sr purification. Previous studies suggested using CH3F, N2O, and SF6 as reaction gases for this method because a better reaction rate can be achieved with Sr+ than with O-2 in the reaction cell. However, these gases are not commonly used in general chemistry laboratories, and processes using these gases are difficult to implement quickly due to regulations. We aim to develop a rapid method that can be applied to many samples for the accurate determination of Sr-87/Sr-86 isotope ratios with precision below 0.1% RSD (or approximately to the fourth decimal place). Methods We evaluated the accuracy and precision of Sr-87/Sr-86 ratios in certified reference materials and different rock types determined using ICP-MS/MS with O-2 as the reaction gas in comparison with those determined using the multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) method. Results This study showed that by using the ICP-MS/MS method, the Sr-87/Sr-86 ratios of BCR-2 and BHVO-2 do not vary significantly with and without prior Sr purification; when the Sr concentration of the measured solution is within the range of 60-350 ng/mL, there is no significant effect on the measured Sr-87/Sr-86 ratios. The results also showed that the Sr-87/Sr-86 ratios of 23 different rock types measured by ICP-MS/MS and MC-ICP-MS methods agree very well. Conclusions The precision of the Sr-87/Sr-86 ratio measured using ICP-MS/MS varies between 0.0001 and 0.0019 (2SD). This precision is less than that of the MC-ICP-MS method but is sufficient for certain applications, such as identifying Sr-87/Sr-86 ratios in different rock types. These results suggest that the developed ICP-MS/MS method has the potential for future studies involving the identification of Sr sources.

引用

页数：8

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