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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Correction of mass fractionation for isotope dilution analysis by MC-ICP-MS

Le Zhang, Zhong-Yuan Ren, Jin-Long Ma, Xiao-Ping Xia
Geochemical Journal, Vol. 51, No. , P. 157-165, 2017

ABSTRACT

Isotope dilution analysis can provide precise elemental concentration and isotopic composition data in a single measurement run. However, mass fractionation correction in isotope dilution analysis can be challenging. This study presents two iterative calculation methods, based on isotopic ratios and abundances, for isotope dilution analysis of elements with at least two internal reference isotopic ratios. The strontium isotope system was used to show the details of the calculations. For convenience, a MATLAB program was created based on these calculation methods. Replicate analyses of three reference materials demonstrate that the obtained Rb and Sr concentrations and 87Sr/86Sr isotopic ratios are in good agreement with previously published values. In addition, two mineral Rb-Sr isochronal ages, which agree with accepted zircon U-Pb ages, demonstrate the validity of the methods presented in this study.

KEYWORDS

isotopic dilution, mass fractionation, MATLAB, MC-ICP-MS, isochronal age

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