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A procedure of "peak cut" on column separation for calcium isotope measurement using double spike technique on thermal ionization mass spectrometry (TIMS)

Abstract

Full recovery on column separation and matrix effects are the two factors that need to be considered for high-precision analysis of stable Ca isotopes, but generally they are difficult to be balanced. In many cases, to get pure Ca fraction, interference of matrix elements is reduced at the cost of discarding a fraction of Ca overlapped with other elements (e.g., Sr and K). However, quantitative evaluation for such approach is short but great needed. Our study investigates the influence of low Ca recovery on δ44/40Ca using thermal ionization mass spectrometry (TIMS) with the double spike technique. δ44/40Ca of IAPSO seawater, ML3B-G and BHVO-2 in different Ca subcuts (e.g., 0-20, 20-40, 40-60, 60-80 and 80-100%) display limited variation after iterative correction by the 42Ca-43Ca double spike with the exponential law. Notably, δ44/40Ca of each Ca subcut with ~20% recovery is consistent with that of Ca procut with full recovery within error. Our results indicate that the 42Ca-43Ca double spike technique can simultaneously correct Ca isotopic fractionation occurred during column separation and TIMS determination, because both of them follow the exponential fractionation law well. Therefore, a procedure of “peak cut” on column separation for Ca isotope measurement using double spike technique on TIMS is proposed. Briefly, we can mix the double spike with the sample solution well before column separation, and then collect the peak of the Ca cut and abandon both sides of Ca eluate that may overlap with other elements. This procedure would eliminate matrix effects efficiently, especially for samples with low CaO contents which are used to be passed through the column twice (e.g., peridotite, dunite).

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Publication details

The article was received on 06 Jan 2018, accepted on 12 Feb 2018 and first published on 14 Feb 2018


Article type: Technical Note
DOI: 10.1039/C8JA00004B
Citation: J. Anal. At. Spectrom., 2018, Accepted Manuscript
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    A procedure of "peak cut" on column separation for calcium isotope measurement using double spike technique on thermal ionization mass spectrometry (TIMS)

    H. Zhu, F. Liu, X. Li, Y. An, G. Wang and Z. zhang, J. Anal. At. Spectrom., 2018, Accepted Manuscript , DOI: 10.1039/C8JA00004B

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