Precise measurement of cerium isotope composition in rock samples

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Abstract

A high-precision analytical method for the measurement of 138Ce 142Ce ratios is reported using static multicollection mass spectrometry. This technique reduced the data acquisition time for 2 hr. for 400 ratios and improved analytical reproducibility to ±0.002% (n-16) and precision to ±0.002-0.003%. The better precision and reproducibility were established collecting a large ion beam [142Ce16O of (2-7) · 10-11 A], short data acquisition time and in situ measurement of 18O 16O ratios during the analysis. To reduce the blank effect to the Ce isotope analysis, the chemical procedure for separation of Ce was refined using a small ion-exchange resin bed column (4 cm length × 3 mm diameter) with which the procedural total blank was lowered to 0.04 ng and the recovery yield of Ce from 20 mg BCR-1 was 90%. In order to confirm the reproducibility of this technique including the chemical procedure, six Ce isotope analyses individually separated from the USGS standard BCR-1, were carried out with an analytical reproducibility of ±0.002%. With these analytical precision and reproducibility and normalization to BCR-1 in order to eliminate any inter-laboratory biases, it is now possible to apply the LaCe isotope system to the terrestrial and extraterrestrial samples combined with other isotope systems, such as SmNd and RbSr.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalChemical Geology: Isotope Geoscience Section
Volume94
Issue number1
DOIs
Publication statusPublished - Nov 1 1991

Fingerprint

Cerium Isotopes
cerium
Isotopes
Rocks
isotope
Chemical analysis
data acquisition
rock
Data acquisition
Ion Exchange Resins
Heavy ions
in situ measurement
Ion beams
Mass spectrometry
analytical method
resin
ion exchange
mass spectrometry
Recovery
ion

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Precise measurement of cerium isotope composition in rock samples. / Makishima, Akio; Nakamura, Eizou.

In: Chemical Geology: Isotope Geoscience Section, Vol. 94, No. 1, 01.11.1991, p. 1-11.

Research output: Contribution to journalArticle

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