Precise multielemental ratios in small foraminiferal samples determined by sector field ICP‐MS

Thomas M. Marchitto

doi:10.1029/2005gc001018

Precise multielemental ratios in small foraminiferal samples determined by sector field ICP‐MS

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Thomas M. Marchitto

Department of Geological Sciences and Institute of Arctic and Alpine Research University of Colorado Campus Box 450 Boulder Colorado 80309 USA

書誌事項

公開日: 2006-05

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2005gc001018

公開者: American Geophysical Union (AGU)

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説明

<jats:p>Inductively coupled plasma mass spectrometry (ICP‐MS) holds two main advantages over other techniques for the measurement of foraminiferal elemental ratios: (1) numerous trace metals may be precisely and simultaneously measured, and (2) smaller samples may theoretically be used. Methods are presented for the precise determination of Mg/Ca, Sr/Ca, Cd/Ca, Zn/Ca, Li/Ca, U/Ca, Mn/Ca, and Fe/Ca by sector field ICP‐MS. Analytical precision is largely independent of sample size over the range of ∼5 to 125 μg CaCO<jats:sub>3</jats:sub>, eliminating the need for narrow target dilutions. Long‐term 1σ precisions are as follows: Mg/Ca = 0.54%, Sr/Ca = 0.57%, Cd/Ca = 1.8%, Zn/Ca = 3.2%, Li/Ca = 0.88%, U/Ca = 1.9%, Mn/Ca = 0.97%, and Fe/Ca = 1.4%. For Mg/Ca, actual foraminiferal samples appear to give reliable results below 10 μg CaCO<jats:sub>3</jats:sub> (postcleaning mass).</jats:p>