Determination of multiple element/calcium ratios in foraminiferal calcite by quadrupole ICP-MS

Yu, J. and Day, J. A. and Greaves, M. J. and Elderfield, H. (2005) Determination of multiple element/calcium ratios in foraminiferal calcite by quadrupole ICP-MS. G3 Geochemistry Geophysics Geosystems, 6. Q08P01, http://dx.doi.org/10.1029/2005GC000964. DOI 10.1029/2005GC000964

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Abstract

A method has been developed for rapid and precise simultaneous determination of nine element/Ca ratios in foraminiferal tests directly from intensity ratios using external, matrix-matched standards on a quadrupole inductively coupled plasma–mass spectrometer (ICP-MS). All quantification isotopes are determined in pulse mode to avoid cross-calibration. Small argide (40Ar26Mg) interferences on 66Zn are corrected by using two additional Mg and Zn standards. A stable signal, conducive for high-precision measurements, is obtained by cone conditioning. Variable calcium concentration has negligible effect on Li, Al, Mn, and Sr, but Ca concentrations for standards and samples need to be constrained at a similar level for precise measurements of Zn, Cd, and U. Aliquots of samples are first analyzed for Ca concentrations on an inductively coupled plasma–atomic emission spectrometer (ICP-AES), and the remaining solutions are diluted to Ca concentration of 100 ppm for ratio measurements to assure data quality. The long-term reproducibility of the method yielded precisions of Li/Ca = 2.4%, B/Ca = 4.2%, Mg/Ca = 1.4%, Al/Ca = 14%, Mn/Ca = 0.9%, Zn/Ca = 2.8% (1.2∼7.8 μmol/mol) and 5.1% (0.5∼1.2 μmol/mol), Sr/Ca = 0.9%, Cd/Ca = 2.4% (0.07∼0.24 μmol/mol) and 4.8% (0.01∼0.07 μmol/mol), and U/Ca = 2.5% for foraminiferal samples as small as 60 μg.

Item Type: Article
Uncontrolled Keywords: 2005 AREP IA48 2005 P IA49
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: G3 Geochemistry Geophysics Geosystems
Volume: 6
Page Range: Q08P01, http://dx.doi.org/10.1029/2005GC000964
Identification Number: 10.1029/2005GC000964
Depositing User: Sarah Humbert
Date Deposited: 12 Aug 2010 10:33
Last Modified: 23 Jul 2013 10:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/1888

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