A low-blank two-column chromatography separation strategy based on a KMnO4 oxidizing reagent for Cr isotope determination in micro-silicate samples by thermal ionization mass spectrometry

doi:10.1039/c7ja00225d

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	A low-blank two-column chromatography separation strategy based on a KMnO4 oxidizing reagent for Cr isotope determination in micro-silicate samples by thermal ionization mass spectrometry
	Li, Chao-Feng 1; Feng, Lian-Jun 1; Wang, Xuan-Ce 2,3; Wilde, Simon-A.2; Chu, Zhu-Yin 1; Guo, Jing-Hui 1
刊名	JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
	2017-10-01
卷号	32 期号:10 页码:1938-1945
ISSN号	0267-9477
DOI	10.1039/c7ja00225d
文献子类	Article
英文摘要	This study has led to a new technique for the separation of Cr from small silicate samples (0.3-2 mg) and determination of stable Cr isotopes in silicates by double spike thermal ionization mass spectrometry (DS-TIMS). Based on our recent two-step exchange resin scheme (Li et al., JAAS, 2016, 31, 2375), we further significantly reduced the procedural blank and improved Cr recovery (94.7-97.5%) from a range of complex silicate rocks varying in composition from andesite to ultra-mafic, and carbonates as well. The key improvement is that KMnO4 was employed to replace conventional (NH4)(2)S2O8 as the oxidizing reagent, which reduces the procedural blank from 1-20 ng in previous studies to 0.15 +/- 0.04 ng (n = 8). In addition, the inhibition effect on the Cr signal caused by residual SO42- in the Cr fraction using the conventional method has been completely eliminated during TIMS measurements. This permits the high precision determination of Cr isotopic ratios from geological samples as small as similar to 46 ng. This chemical procedure was verified using a variety of silicate rocks in the size range of 0.3-2 mg. A series of analyses demonstrated that it is possible to attain internal precisions (2 SE) of +/- 0.03 to 0.06 parts per thousand. Replicate digestions and analyses of basalt standard BIR-1 with a sample size of 0.3 mg (delta Cr-53 = -0.158 +/- 0.052 parts per thousand, 2 SD) demonstrated that good intermediate precision is obtainable for extremely small silicate samples.
WOS关键词	MC-ICP-MS ; EARLY SOLAR-SYSTEM ; CHROMIUM ISOTOPES ; GEOLOGICAL-MATERIALS ; HEXAVALENT CHROMIUM ; RATIOS ; COPRECIPITATION ; FRACTIONATION ; FLUCTUATIONS ; OXYGENATION
WOS研究方向	Chemistry ; Spectroscopy
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000414347800012
资助机构	National Natural Science Foundation of China(41373020 ; National Natural Science Foundation of China(41373020 ; State Key Laboratory of Lithospheric Evolution(11301520) ; State Key Laboratory of Lithospheric Evolution(11301520) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ARC(FT140100826) ; ARC(FT140100826) ; 41490632 ; 41490632 ; 41525012) ; 41525012) ; National Natural Science Foundation of China(41373020 ; National Natural Science Foundation of China(41373020 ; State Key Laboratory of Lithospheric Evolution(11301520) ; State Key Laboratory of Lithospheric Evolution(11301520) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ARC(FT140100826) ; ARC(FT140100826) ; 41490632 ; 41490632 ; 41525012) ; 41525012) ; National Natural Science Foundation of China(41373020 ; National Natural Science Foundation of China(41373020 ; State Key Laboratory of Lithospheric Evolution(11301520) ; State Key Laboratory of Lithospheric Evolution(11301520) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ARC(FT140100826) ; ARC(FT140100826) ; 41490632 ; 41490632 ; 41525012) ; 41525012) ; National Natural Science Foundation of China(41373020 ; National Natural Science Foundation of China(41373020 ; State Key Laboratory of Lithospheric Evolution(11301520) ; State Key Laboratory of Lithospheric Evolution(11301520) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; ARC(FT140100826) ; ARC(FT140100826) ; 41490632 ; 41490632 ; 41525012) ; 41525012)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62458]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Li, Chao-Feng
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Curtin Univ, Dept Appl Geol, Inst Geosci Res TIGeR, GPO Box U1987, Perth, WA 6845, Australia 3.Changan Univ, Sch Earth Sci & Resource, Xian 710054, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Li, Chao-Feng,Feng, Lian-Jun,Wang, Xuan-Ce,et al. A low-blank two-column chromatography separation strategy based on a KMnO4 oxidizing reagent for Cr isotope determination in micro-silicate samples by thermal ionization mass spectrometry[J]. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,2017,32(10):1938-1945.
APA	Li, Chao-Feng,Feng, Lian-Jun,Wang, Xuan-Ce,Wilde, Simon-A.,Chu, Zhu-Yin,&Guo, Jing-Hui.(2017).A low-blank two-column chromatography separation strategy based on a KMnO4 oxidizing reagent for Cr isotope determination in micro-silicate samples by thermal ionization mass spectrometry.JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY,32(10),1938-1945.
MLA	Li, Chao-Feng,et al."A low-blank two-column chromatography separation strategy based on a KMnO4 oxidizing reagent for Cr isotope determination in micro-silicate samples by thermal ionization mass spectrometry".JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 32.10(2017):1938-1945.