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  3. TIMS measurements of full range of natural Ca isotopes with internally consistent fractionation correction
 

TIMS measurements of full range of natural Ca isotopes with internally consistent fractionation correction

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BORIS DOI
10.7892/boris.75175
Date of Publication
2015
Publication Type
Article
Division/Institute

Institut für Geologie...

Author
Dèzes, Mariia Oleksiivnaorcid-logo
Institut für Geologie
Bouman, Claudia
Nägler, Frank Thomasorcid-logo
Institut für Geologie
Mezger, Klausorcid-logo
Institut für Geologie
Villa, Igor Mariaorcid-logo
Institut für Geologie
Subject(s)

500 - Science::550 - ...

Series
International journal of mass spectrometry
ISSN or ISBN (if monograph)
1387-3806
Publisher
Elsevier
Language
English
Publisher DOI
10.1016/j.ijms.2015.07.012
Uncontrolled Keywords

TIMS; Static measurem...

Ca isotopes

SRM915

Mass fractionation co...

40Ca/44Ca

Description
This study presents static measurements of the Ca isotopic composition of standard reference materials SRM 915 a/b on a Triton Plus™ thermal ionization mass spectrometer with a specially developed Faraday cup array allowing simultaneous measurement of 40Ca and 48Ca. The total amount of Ca in all analyses was kept < 1 µg. With this setup the measurement uncertainties were 0.06 ‰ for 40Ca/44Ca and 0.12 ‰ for 48Ca/40Ca. Measuring all isotopes simultaneously better allows to test the internal consistency of different Ca isotope abundances reported in the literature. The exponential law was observed to correct incompletely instrumental mass fractionation. An improved fractionation correction based on the exponential law is proposed. It changes the 40Ca/44Ca ratio of SRM 915a (corrected relative to 42Ca/44Ca = 0.31221; 48Ca/44Ca = 0.08871) from 47.1635 ± 0.0028 to 47.1649 ± 0.0047. The measurements of SRM 915b were performed with different analytical conditions (runs were prolonged till complete filament load depletion). Even if the 40Ca/44Ca ratio of SRM 915b, when corrected with the simple exponential law, appears different (47.1532 ± 0.0038) from that of SRM 915a, it becomes coincident (47.1613 ± 0.0028) when corrected with a second-order refinement. This supports the use of the improved exponential law to obtain internally consistent Ca isotope ratio for natural samples.
Handle
https://boris-portal.unibe.ch/handle/20.500.12422/137582
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