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Effects of different cone combinations on accurate and precisedetermination of Li isotopic composition by MC-ICP-MS
Gou,LF(Gou,Longfei)1,2; Jin,ZD(Jin,Zhangdong)1,3; Deng,L(Deng,Li)1; He,MY(He,Maoyong)1; Liu,CY(Liu,Chunyao)1,2; Jin,Zhangdong
2018-08
发表期刊Spectrochimica Acta Part B
卷号146期号:2018页码:1-8
文章类型期刊论文
摘要The multiple collector inductively coupled plasma mass spectrometer (MC-ICP-MS) is booming to be a high-precision, fast, and accurate instrument in measuring lithium (Li) isotopes. Modified highly sensitive Jet sample and X skimmer cones have largely upgraded analytical sensitivity and reduced sample consumption with distinct instrumental mass bias behaviors. Herein, four available combinations of the sample and skimmer cones [Jet sample cone + X skimmer cone (Jet + X), Standard sample cone + X skimmer cone (Standard + X), Standard sample cone + H skimmer cone (Standard + H), and Jet sample cone + H skimmer cone (Jet + H)] were tested for their effects on peak shape, sensitivity, mass bias behavior, and accuracy and precision of Li isotopic measurements in solution mode. The results showed that all four combinations were able to attain an ideal peak shape by adjusting the associated parameters, with a positively linear relation between 7Li (and 6Li) signals and Li concentrations. For a given Li concentration, the sensitivities were enhanced 3–7 times using the Standard + X, the Jet + H, and the Jet +X combinations compared to that of using the Standard + H. The enhanced sensitivity is attributable to more plasma ions introduced into the mass spectrometer through the Jet and X cones. Mass bias is distinct for different cone combinations, with a slight difference with various Li concentrations, indicating the neccesity of concentration match during measurement. Among the four cone combinations, the best reproducibility can be obtained by using the Standard + X cones to determine precise and accurate Li isotopes for samples. Furthermore, a pretreatment by 5% HNO3 and 0.1% HF, and then 2% HNO3 prior to analyses can minimize the memory effect of Li.
关键词Lithium Isotopes Cone Combination Mass Bias Mc-icp-ms
DOI10.1016/j.sab.2018.04.015
收录类别SCI
所属项目编号41773149
语种英语
项目资助者National Natural Science Foundation of China ; National Natural Science Foundation of China
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文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5270
专题加速器质谱中心
通讯作者Jin,Zhangdong
作者单位1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
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Gou,LF,Jin,ZD,Deng,L,et al. Effects of different cone combinations on accurate and precisedetermination of Li isotopic composition by MC-ICP-MS[J]. Spectrochimica Acta Part B,2018,146(2018):1-8.
APA Gou,LF,Jin,ZD,Deng,L,He,MY,Liu,CY,&Jin,Zhangdong.(2018).Effects of different cone combinations on accurate and precisedetermination of Li isotopic composition by MC-ICP-MS.Spectrochimica Acta Part B,146(2018),1-8.
MLA Gou,LF,et al."Effects of different cone combinations on accurate and precisedetermination of Li isotopic composition by MC-ICP-MS".Spectrochimica Acta Part B 146.2018(2018):1-8.
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