干旱区生态环境知识资源中心(Arid): Factors affecting chromium isotope measurements using the double-spike method

Arid

DOI	10.1002/rcm.8483
	Factors affecting chromium isotope measurements using the double-spike method
	Zhang, Qun 1,2; Liu, Jia 1; Zhang, Yingnan 1; Yu, Huimin 1; Qin, Liping 1,2; Shen, Ji 1,2
通讯作者	Qin, Liping
来源期刊	RAPID COMMUNICATIONS IN MASS SPECTROMETRY
ISSN	0951-4198
EISSN	1097-0231
出版年	2019
卷号	33 期号:17 页码:1390-1400
英文摘要	Rationale The double-spike technique is widely used in stable metal isotope measurements to correct for instrumental fractionation, and this method has achieved prominence for chromium (Cr) isotope measurements in the past decade or so. For this method to work, precise calibration of the double spike was thought to be indispensable. However, the effect of carrying out this precise calibration has not been fully evaluated. Moreover, other factors that can affect the accuracy of Cr isotope measurements using the double spike have also not been thoroughly evaluated. Methods First using theoretical calculation, we assessed whether precise knowledge of the measured mass fractionation of the double spike is necessary. We then developed a double-spike method for measuring the Cr stable isotopic composition using multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). We tested the key factors that can affect the accuracy of Cr isotope measurements. Results By theoretical calculation we found that the uncorrected instrumental mass fractionation of the double spike will not result in any systematic bias on the measurements of delta Cr-53 values in the sample, provided that the double spike, standard and sample are measured on the same instrument and with the same cup configuration. Incorporating this result, with our new method, the presence of Fe and Ti (up to 5% wt of the Cr concentration in the sample) can be fully corrected. The long-term reproducibility of an internal standard was +/- 0.04 parts per thousand (2SD), and the external reproducibility on the delta Cr-53 difference between our internal standard and the NIST Standard Reference Material 3112a was -0.07 +/- 0.05 parts per thousand. The delta Cr-53 values for a set of USGS geological reference materials including basalt (BHVO-1,2; BIR-1; GSR-3), mica schist (SDC-1), diabase (W-2-a), peridotite (PCC-1) and dunite (DTS-2) were measured, with our results for BHVO-2 and BIR-1 being consistent with previously reported values. Conclusions We have shown that precise knowledge of the measured mass fractionation of the double spike is not necessary during spike calibration and thus the calibration procedure is simplified. We can apply our new Cr isotope method to a range of geological rock samples with a wide range of variation in the chemical composition.
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000479046400003
WOS关键词	MC-ICP-MS ; HEXAVALENT CHROMIUM ; MOJAVE DESERT ; FRACTIONATION ; MOLYBDENUM ; REDUCTION ; PURIFICATION ; GROUNDWATER ; RATIOS
WOS类目	Biochemical Research Methods ; Chemistry, Analytical ; Spectroscopy
WOS研究方向	Biochemistry & Molecular Biology ; Chemistry ; Spectroscopy
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218313
作者单位	1.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China; 2.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qun,Liu, Jia,Zhang, Yingnan,et al. Factors affecting chromium isotope measurements using the double-spike method[J],2019,33(17):1390-1400.
APA	Zhang, Qun,Liu, Jia,Zhang, Yingnan,Yu, Huimin,Qin, Liping,&Shen, Ji.(2019).Factors affecting chromium isotope measurements using the double-spike method.RAPID COMMUNICATIONS IN MASS SPECTROMETRY,33(17),1390-1400.
MLA	Zhang, Qun,et al."Factors affecting chromium isotope measurements using the double-spike method".RAPID COMMUNICATIONS IN MASS SPECTROMETRY 33.17(2019):1390-1400.