Fietzke, Jan , Liebetrau, Volker, Günther, D., Frische, A., Zumholz, Karsten, Hansteen, T. H. and Eisenhauer, Anton (2008) Alternative data reduction for precise and accurate isotope ratio determination via LA-MC-ICP-MS. [Talk] In: Goldschmidt Conference 2008. , 13.-18.07.2008, Vancouver, Canada .

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Abstract

An alternative approach for the evaluation of isotope ratio data using LA-MC-ICP-MS will be presented. In contrast to previously applied methods it is based on the simultaneous
responses of all analyte isotopes of interest and the relevant interferences without performing a conventional background correction.
Significant improvements in precision and accuracy can
be achieved when applying this new method and will be
discussed based on the results of two first methodical
applications: a) radiogenic and stable Sr isotopes in carbonates b) stable chlorine isotopes of pyrohydrolytic extracts.
In carbonates an external reproducibility of the 87Sr/86Sr
ratios of about 19 ppm (RSD) was achieved, an improvement
of about a factor of 5. For recent and sub-recent marine
carbonates a mean radiogenic strontium isotope ratio 87Sr/86Sr of 0.709170 ± 0.000007 (2SE) was determined, which agrees well with the value of 0.7091741 ± 0.0000024 (2SE) reported for modern sea water [1].
Stable chlorine isotope ratios were determined ablating
pyrohydrolytic extracts with a reproducibility of about 0.05‰ (RSD). For basaltic reference material JB1a and JB2 chlorine isotope ratios were determined relative to SMOC (standard mean ocean chlorinity) δ37ClJB-1a = (-0.99 ± 0.06) ‰ and δ37ClJB-2 = (-0.60 ± 0.03) ‰ (2SE), respectively, in accordance with published data [2].
The described strategies for data reduction are considered
to be generally applicable for all isotope ratio measurements using LA-MC-ICP-MS.
[1] McArthur, Rio, Massari, Castradori, Bailey, Thirlwall &
Houghton (2006) Palaeogeo. Palaeoclim. Palaeoeco. 242,
126, doi: 10.1016/j.palaeo.2006.06.004 [2] Fietzke,. Frische, Hansteen & Eisenhauer (2008) J. Anal. At. Spectrom. 2008, doi:10.1039/B718597A.

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