Podrobnosti záznamu

Název
    Precise measurement of Li isotopes in planktonic foraminiferal tests by quadrupole ICPMS
Údaj o odpovědnosti
    Jan Košler, Michal Kučera, Paul Sylvester
Autor
    Košler, Jan, 1965-
    Kučera, Michal
    Sylvester, Paul
Jazyk
    anglicky
Zdrojový dokument - seriál
    Chemical geology (including isotope geoscience)
Svazek/č.
    Vol. 181, no. 1-4
Strany
    p. 169-179
Rok
    2001
Poznámky
    6 obr., 1 tab., 2 s.bibl.
    il.
    Zkr. název ser.: Chem. Geol. (Isotope Geosci.)
Předmětová skupina
    biochemie
    Foraminifera
    frakcionace izotopická
    geochemie izotopická
    izotopy Li
    kalcit
    lithium
    metoda ICP
    plankton
    recent
    spektrometrie hmotnostní
Geografické jméno
    Atlantik rovníkový
    Pacifik rovníkový
Klíčové slovo
    Foraminiferal
    ICPMS
    Isotopes
    Li
    Measurement
    Planktonic
    Precise
    Quadrupole
    Tests
Abstrakt (anglicky)
   Precise measurements of the isotopic composition of Li in low-concentration natural carbonate samples is demonstrated fro quadrupole ICPMS. Cool plasma conditions result in high sample/background ratios for the measured Li signals even for low concentrations. Quantitative chemical separation of Li prior to the measurement on ICPMS is necessary to avoid the matrix-induced isotopic fractionation and the results have to be externally corrected for mass bias and instrumental fractionation. The isotopic composition of lithium can be measured in samples containing only 5-10 Li with a within-run precision better than 0.5% (2 standard errors of the mean), and a long term reproducibility that is better that 2.1% (2 standard deviations).
   the method has been successfully used to measure Li isotopic composition of 1-10 mg samples of calcium carbonate tests of Pulleniatina obliquiloculata and Globorotalia tumida that were collected from the sediment-seawater interface and have Li concentrations of about 1 ppm. The isotopic composition of Li in studied calcium carbonate tests of P. obliquiloculata is independent of the size of tests and resembles the lithium isotopic composition of modern seawater, suggesting that this species may provide a record of Li isotope variation in past oceansPrecise measurements of the isotopic composition of Li in low-concentration natural carbonate samples is demonstrated fro quadrupole ICPMS. Cool plasma conditions result in high sample/background ratios for the measured Li signals even for low concentrations.
   Quantitative chemical separation of Li prior to the measurement on ICPMS is necessary to avoid the matrix-induced isotopic fractionation and the results have to be externally corrected for mass bias and instrumental fractionation. The isotopic composition of lithium can be measured in samples containing only 5-10 Li with a within-run precision better than 0.5
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    29. 8. 2007
Datum importu
    8. 8. 2012