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

Dèzes, Mariia Oleksiivna; Bouman, Claudia; Nägler, Thomas; Mezger, Klaus; Villa, Igor Maria (2015). TIMS measurements of full range of natural Ca isotopes with internally consistent fractionation correction. International journal of mass spectrometry, 387, pp. 60-68. Elsevier 10.1016/j.ijms.2015.07.012

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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.

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Dèzes, Mariia Oleksiivna, Nägler, Frank Thomas, Mezger, Klaus, Villa, Igor Maria


500 Science > 550 Earth sciences & geology






[UNSPECIFIED] Schweizer Nationalfonds




Igor Maria Villa-Toscani

Date Deposited:

08 Feb 2016 10:55

Last Modified:

02 Mar 2023 23:27

Publisher DOI:


Web of Science ID:


Uncontrolled Keywords:

TIMS; Static measurement, Ca isotopes, SRM915, Mass fractionation correction, 40Ca/44Ca





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