Ultra small-mass AMS 14C sample preparation and analyses at KCCAMS/UCI Facility

By G. Santos, J. Southon, S. Griffin, S. Beaupré, E. Druffel. 2007

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We have developed techniques for accurately and precisely measuring samples containing less than a few hundred micrograms of carbon, using a compact AMS system (NEC 0.5 MV 1.5SDH-1). Detailed discussions of the sample preparation, measurement setup, data analysis and background corrections for a variety of standard samples ranging from 0.002 to 1 mgC are reported. Multiple aliquots of small amounts of CO2 were reduced to graphite with H2 over pre-baked iron powder catalyst. A reduction reaction temperature of 450 � C was adopted for graphite samples below 0.05 mgC, rather than the usual 550 � C used on samples of 0.1–1 mgC. In our regular reactors (� 3.1 cm 3 ), this reduction in temperature improved the graphite yield from � 60 to 90–100% for samples ranging from 0.006– 0.02 mgC. The combination of lower reaction temperature with a reduced reactor volume (� 1.6 cm 3 ) gave yields as high as 100% on graphite samples <0.006 mgC. High performance measurements on ultra-small samples are possible also due to a modified NEC

Subfields: Ecology, Global and Planetary Change, Radiation

View Paper: https://www.semanticscholar.org/paper/8a8f87379f843a49030b87c2bfbd656eea8c5629

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