Automatic AMS Sample Combustion and CO2 Collection

• Published in: Radiocarbon Vol. 43; no. 2A; pp. 293 - 298
• Main Authors: Aerts-Bijma, A T, van der Plicht, J, Meijer, H A J
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, US Cambridge University Press 2001; University of Arizona
• Subjects: B. The Methods; Excavation and methods; I. Becoming Better; Laboratory methods; Methodology and general studies; Physical and chemical analysis; Prehistory and protohistory; Combustion; Method; Sampling; Physical analysis; Mass spectrometry; Chromatography
• DOI: 10.1017/S0033822200038133
• ISSN: 0033-8222

In Groningen, all organic samples for accelerator mass spectrometry (AMS) are combusted in an automatic Elemental Analyzer, coupled to an Isotope Ratio Mass Spectrometer and Cryogenic Trapping System. The Gas Chromatographic (GC) column, part of the Elemental Analyzer system, appeared to be the main cause for memory effects. Therefore we modified the Elemental Analyzer, such that the trapped CO2 no longer passed the GC column. Our system modification reduced the memory effect significantly, as shown by lower radiocarbon concentration values for anthracite backgrounds, and a much smaller spread in these values. Our modified system can perform up to 40 combustions unattended in about 6 hr.