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Summary: An Isotope Dilution ICP-MS Method for the Determination
of Mg / Ca and Sr / Ca Ratios in Calcium Carbonate
Diego P. Fernandez (1)*, Alex C. Gagnon and Jess F. Adkins
Geology and Planetary Science, California Institute of Technology, MS 100-23, 1200 E California Blvd, Pasadena, CA 91125, USA
* Corresponding author. e-mail: diego.fernandez@utah.edu
(1) Present address: Geology and Geophysics, University of Utah, 115 South 1460 East Room 383, Salt Lake City, UT 84112, USA
Mg / Ca and Sr / Ca ratios in calcium carbonate are
important components of many palaeoclimate
studies. We present an isotope dilution method
relying on a single mixed spike containing 25
Mg,
43
Ca and 87
Sr. Dozens of samples per day, as small
as 10 lg of carbonate, could be dissolved, spiked
and run in an ICP-MS with a precision of 0.8% (2
RSD). Two instruments types, a sector field and a
quadrupole ICP-MS, were compared. The best long
term precision found was 0.4% (2 RSD), although
this increased by up to a factor of two when samples
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