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The use of sector field ICP-mass spectrometry for Rb-Sr geochronological dating

Frank Vanhaecke UGent, Günther De Wannemacker, Luc Moens UGent and Peter Van den haute UGent (2001) FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY. 371(7). p.915-920
abstract
Rb-Sr dating, one of the most important tools in geochronology, requires determination of the Rb/Sr concentration ratios and the Sr-87/Sr-86 isotope ratios in cogenetic minerals or rocks and is traditionally performed by thermal ionization mass spectrometry (TIMS). In this work we investigated whether sector field inductively coupled plasma mass spectrometry (ICP-MS), which is characterized by a high sample throughput and straightforward sample introduction, could be used as an alternative to TIMS. To avoid spectral overlap of the ion signals of the isobaric nuclides Sr-87 and Rb-87, Sr was separated from Rb by cation-exchange chromatography. A mathematical correction was applied to take into account the small amount of Rb that can be present in the Sr fraction. The isotope ratio accuracy and precision attainable with ICP-MS were evaluated by analysis of several reference materials from the US Geological Survey. The results of this evaluation show that excellent accuracy could be achieved, the internal precision (repeatability) of the isotope ratio (expressed as the relative standard deviation for 10 successive 1-min measurements) was 0.04-0.12%. An attempt was made to calculate the total or combined uncertainty on the isotope ratio results, by also taking into account other possible error sources (corrections for mass discrimination, detector dead time, blank signal and Rb fraction). Finally, the same procedure was used for dating two rock formations that were 2500 Ma and 350 Ma old, according to age determinations previously performed by the Rb-Sr laboratory of the University of Munchen (Germany) using TIMS. The ICP-MS results (2520 +/- 150 Ma and 379 +/- 48 Ma) obtained for these formations compare well with the corresponding TIMS data (2509 +/- 120 Ma and 357 +/- 25 Ma).
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
MS, ISOTOPE RATIO MEASUREMENTS, PRECISION, TIME
journal title
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
Fresenius J. Anal. Chem.
volume
371
issue
7
pages
915 - 920
Web of Science type
Article
Web of Science id
000172742900004
JCR category
CHEMISTRY, ANALYTICAL
JCR impact factor
1.649 (2001)
JCR rank
22/67 (2001)
JCR quartile
2 (2001)
ISSN
0937-0633
DOI
10.1007/s002160101049
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
138537
handle
http://hdl.handle.net/1854/LU-138537
date created
2004-01-14 13:37:00
date last changed
2012-11-14 13:58:42
@article{138537,
  abstract     = {Rb-Sr dating, one of the most important tools in geochronology, requires determination of the Rb/Sr concentration ratios and the Sr-87/Sr-86 isotope ratios in cogenetic minerals or rocks and is traditionally performed by thermal ionization mass spectrometry (TIMS). In this work we investigated whether sector field inductively coupled plasma mass spectrometry (ICP-MS), which is characterized by a high sample throughput and straightforward sample introduction, could be used as an alternative to TIMS. 
To avoid spectral overlap of the ion signals of the isobaric nuclides Sr-87 and Rb-87, Sr was separated from Rb by cation-exchange chromatography. A mathematical correction was applied to take into account the small amount of Rb that can be present in the Sr fraction. The isotope ratio accuracy and precision attainable with ICP-MS were evaluated by analysis of several reference materials from the US Geological Survey. The results of this evaluation show that excellent accuracy could be achieved, the internal precision (repeatability) of the isotope ratio (expressed as the relative standard deviation for 10 successive 1-min measurements) was 0.04-0.12\%. An attempt was made to calculate the total or combined uncertainty on the isotope ratio results, by also taking into account other possible error sources (corrections for mass discrimination, detector dead time, blank signal and Rb fraction). 
Finally, the same procedure was used for dating two rock formations that were 2500 Ma and 350 Ma old, according to age determinations previously performed by the Rb-Sr laboratory of the University of Munchen (Germany) using TIMS. The ICP-MS results (2520 +/- 150 Ma and 379 +/- 48 Ma) obtained for these formations compare well with the corresponding TIMS data (2509 +/- 120 Ma and 357 +/- 25 Ma).},
  author       = {Vanhaecke, Frank and De Wannemacker, G{\"u}nther and Moens, Luc and Van den haute, Peter},
  issn         = {0937-0633},
  journal      = {FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY},
  keyword      = {MS,ISOTOPE RATIO MEASUREMENTS,PRECISION,TIME},
  language     = {eng},
  number       = {7},
  pages        = {915--920},
  title        = {The use of sector field ICP-mass spectrometry for Rb-Sr geochronological dating},
  url          = {http://dx.doi.org/10.1007/s002160101049},
  volume       = {371},
  year         = {2001},
}

Chicago
Vanhaecke, Frank, Günther De Wannemacker, Luc Moens, and Peter Van den haute. 2001. “The Use of Sector Field ICP-mass Spectrometry for Rb-Sr Geochronological Dating.” Fresenius Journal of Analytical Chemistry 371 (7): 915–920.
APA
Vanhaecke, Frank, De Wannemacker, G., Moens, L., & Van den haute, P. (2001). The use of sector field ICP-mass spectrometry for Rb-Sr geochronological dating. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 371(7), 915–920.
Vancouver
1.
Vanhaecke F, De Wannemacker G, Moens L, Van den haute P. The use of sector field ICP-mass spectrometry for Rb-Sr geochronological dating. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY. 2001;371(7):915–20.
MLA
Vanhaecke, Frank, Günther De Wannemacker, Luc Moens, et al. “The Use of Sector Field ICP-mass Spectrometry for Rb-Sr Geochronological Dating.” FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY 371.7 (2001): 915–920. Print.