Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
  Chemical separation and MC-ICPMS analysis of U, Th, Pa and Ra isotope ratios of carbonates

Obert, J. C., Scholz, D., Lippold, J., Felis, T., Jochum, K. P., & Andreae, M. O. (2018). Chemical separation and MC-ICPMS analysis of U, Th, Pa and Ra isotope ratios of carbonates. Journal of Analytical Atomic Spectrometry, 33(8), 1372-1383. doi:10.1039/c7ja00431a.

Item is

Basisdaten

einblenden: ausblenden:
Genre: Zeitschriftenartikel

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Obert , J. Christina1, Autor
Scholz, Denis2, Autor           
Lippold, Joerg1, Autor
Felis, Thomas1, Autor
Jochum, Klaus P.2, Autor           
Andreae, Meinrat O.3, Autor           
Affiliations:
1external, ou_persistent22              
2Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              
3Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 Zusammenfassung: Diagenetic alteration of fossil reef corals may have severe effects on the reliability of 230Th/U-ages. The widely applied criteria introduced to test for the reliability of coral 230Th/U-ages are often not sufficient to identify all altered ages. The combination of 230Th/U- with 231Pa/U-dating has been suggested as a promising method to identify altered ages. Furthermore, 226Ra/230Th ratios can provide information about the diagenetic history during the last 10 000 years. Here we present a method to chemically separate U, Th, Pa and Ra from the same aliquot of a carbonate sample. The isotope ratios of our mixed U–Th–Pa–Ra spike are calibrated using a secular equilibrium material treated in the same way as the samples during chemical separation and mass spectrometric analysis. This approach does not only circumvent corrections for the radioactive decay of the short-lived 233Pa spike, but also enables us to estimate the reproducibility of the spike calibration. The relative standard deviation (RSD) of the spike ratios is 0.27% for 229Th/236U, 4.2% for 228Ra/236U and between 0.6 and 4.0% for 233Pa/236U. The RSDs of the final ratios are 1.2% for 231Pa/235U and 3.4% for 226Ra/230Th. We assess the individual sources of uncertainty (e.g., mass spectrometric corrections, counting statistics, and spike calibration) in detail and quantify their contribution to the total uncertainties of the final isotope ratios. Most corrections contribute only moderately to the final uncertainties. However, in the case of a large abundance of natural isotopes in the spike, this correction can have a large influence on both the ratios and their uncertainties. Another parameter affecting the final uncertainties and the reproducibility of the method is the sample size and, thus, the concentration of the natural isotopes. This discussion provides useful guidelines for future applications and can be adjusted to the individual requirements of a specific user.

Details

einblenden:
ausblenden:
Sprache(n): eng - English
 Datum: 2018
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000451452700011
DOI: 10.1039/c7ja00431a
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Journal of Analytical Atomic Spectrometry
  Andere : J. Anal. At. Spectrom.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: London : Royal Society of Chemistry
Seiten: - Band / Heft: 33 (8) Artikelnummer: - Start- / Endseite: 1372 - 1383 Identifikator: ISSN: 0267-9477
CoNE: https://pure.mpg.de/cone/journals/resource/954925268302