A high-precision analytical method for the measurement of 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 La-Ce isotope system to the terrestrial and extraterrestrial samples combined with other isotope systems, such as Sm-Nd and Rb-Sr.
@article{20200930025819-898019,
author = "Makishima, Akio and Nakamura, Eizo",
title = "Precise measurement of cerium isotope composition in rock samples",
journal = "Chemical Geology: Isotope Geoscience section",
year = "1991",
number = "1",
volume = "94",
pages = "1-11",
doi = "10.1016/0168-9622(91)90035-U",
}
caption | ID | rowname | stone | ||
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Tabel 5. Analytical results of analyses of BCR-1 pub | 20200930031144-407875 | Ce (Max, 1991) | 1 | ||