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

Marchitto Thomas M. | Zendy

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

Author(s) -

Marchitto Thomas M.

Publication year - 2006

Publication title -

geochemistry, geophysics, geosystems

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.928

H-Index - 136

ISSN - 1525-2027

DOI - 10.1029/2005gc001018

Subject(s) - inductively coupled plasma mass spectrometry , analytical chemistry (journal) , inductively coupled plasma , mass spectrometry , mineralogy , geology , chemistry , plasma , environmental chemistry , chromatography , physics , quantum mechanics

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 3 , 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 3 (postcleaning mass).

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