Resonant laser-SNMS of boron for analysis of paleoceanographic samples


Contact
jbijma [ at ] awi-bremerhaven.de

Abstract

Calcite shells of foraminifera, which are accumulated in the ocean sediment, are an important object of paleoceanographic studies to reconstruct environmental parameters of the past. Foraminifera are unicellular organisms living in almost all parts of the ocean during the entire paleoceanographic time scale. The isotope ratio of boron incorporated in the calcite shell provides information about the pH-value of the ocean at the time the shell was formed. Since the boron fraction of such a shell is about 5 ppm, an extremely sensitive technique is necessary to determine boron isotope ratio with sufficient accuracy and precision. Resonant laser secondary neutral mass spectrometry (r-laser-SNMS) was used to measure boron isotope ratios in calcite shells.Analysis was carried out with a time-of-flight mass spectrometer equipped with an electron impact gun for sputtering and a Ga+ primary ion source. Resonant ionization of sputtered boron neutrals was performed via a three-step ionization scheme accomplished with two tunable dye lasers and the fundamental wavelength of a Nd:YAG laser. After optimizing the boron ionization and detection process, boron isotope ratios were directly measured on single foraminiferal shells after removing contaminants by Ar+ ion beam sputtering.



Item Type
Article
Authors
Divisions
Programs
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
13917
Cite as
Vering, G. , Crone, C. , Kathers, P. , Bijma, J. and Arlinghaus, H. F. (2006): Resonant laser-SNMS of boron for analysis of paleoceanographic samples , Appl.Surf.Sci., 252 , pp. 7163-7166 .


Download
[img]
Preview
PDF (Fulltext)
Ver2005b.pdf

Download (367kB) | Preview
Cite this document as:

Share

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item