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Integrating Continuous-Flow Mass Spectrometry and Automatic CO2 Collection for AMS

Published online by Cambridge University Press:  18 July 2016

Jesper Olsen,
Jan Heinemeier,
Klaus Bahner,
Barry Graney and
Andy Phillips
Jesper Olsen*
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, DenmarkDepartment of Earth Sciences, Aarhus University, DK-8000 Aarhus C, Denmark
Jan Heinemeier
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Klaus Bahner
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Barry Graney
Affiliation:
GV Instruments, Crewe Road, Wythenshawe, Manchester M23 9BE, United Kingdom
Andy Phillips
Affiliation:
GV Instruments, Crewe Road, Wythenshawe, Manchester M23 9BE, United Kingdom
*
Corresponding author. Email: jesper.olsen@geo.au.dk
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Abstract

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Accelerator mass spectrometry (AMS) radiocarbon measurements of organic samples require combustion to obtain CO2 for graphitization. Furthermore, determination of δ13C values is required in order to correct the 14C age due to carbon isotope fractionation effects. δ13C analysis is commonly carried out by stable isotope mass spectrometry because most applications demand high-precision δ13C values in addition to the requirements of 14C dating. A simplifying step is therefore to combine the combustion for stable isotope analysis with cryogenic trapping of CO2 for AMS graphite targets. Presented here is a simple CO2 trapping device based on a modified Gilson 220XL sampling (manifold) robot coupled to the inlet manifold system of a GV Instruments IsoPrime stable isotope mass spectrometer. The system is capable of batch combustion and analysis of up to 40 samples and is under full computer control by the mass spectrometer software. All trapping parameters such as flush time prior to trapping and total trap time are adjustable through the standard software user interface. A low 14C activity of background materials and high precision and accuracy of stable isotope analysis of carbon and nitrogen are demonstrated.

Information

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 2 , 2007, pp. 233 - 244
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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