noaa-ocean-5947
Marchitto 2006 Precise Sector Field ICP-MS Foram Multi-Elemental Ratios
Marchitto, T.M.
Marchitto 2006 Precise Sector Field ICP-MS Foram Multi-Elemental Ratios
2007-01-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5947
Investigator
T.M.
Marchitto
earth science
paleoclimate
paleocean
geochemistry
geoscientificInformation
-50 cal yr BP
-60 cal yr BP
Complete
-90
90
-180
180
Geographic Region
Global
Global>LATITUDE >LONGITUDE
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Marchitto, T.M. 2007. Precise multielemental ratios in small foraminiferal samples determined by sector field ICP-MS. Geochem. Geophys. Geosyst., 7, Q05P13. doi:10.1029/2005GC001018.
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 ug CaCO3, eliminating the need for narrow target dilutions. Long-term 1 sigma 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 ug CaCO3 (postcleaning mass).
STUDY NOTES: 46Ca/43Ca count ratios were blank-corrected and normalized to bring
mean of standards in each run to 2.6.
Metal/Ca deviations were calculated as (Me/Ca)meas/(Me/Ca)known - 1.
Outliers are 2s relative to linear equations through all data.
Final sample masses were calculated from measured [Ca].
VARIABLES AND UNITS:
46Ca/43Ca count ratios (%)
Ca concentrations (mM)
Metal/Ca deviations from known (ratio-1)
G. bulloides Mg/Ca (mmol/mol)
sample size as mass CaCO3 (ug)
PRECISION:
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%
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/marchitto2006/marchitto2006.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/marchitto2006/marchitto2006.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11