An improved setup for radiocarbon analysis of water-soluble organic carbon in environmental matrices

This paper presents an improved setup for radiocarbon analysis of water-soluble organic carbon based on wet chemical oxidation as installed at the Laboratory for the Analysis of Radiocarbon with AMS (LARA) at the University of Bern. The implementation of a non-dispersive infrared CO 2 detector allows more precise and accurate quantification of carbon amounts in samples and establishes the possibility of simple monitoring of the efficacy of flushing and sampling processes. A detailed blank assessment unveiled undesired oxidation of different materials and sample temperature as critical factors regarding the level of constant contamination. Contamination arising from oxidation of septum pieces and carbon-based glues in conventional sampling needles was minimized by developing a glass-sintered needle. This new needle was also designed to be longer, reducing the minimum amount of sample solution needed to 2 mL. The oxidation time and temperature (1 hr at 75°C) were optimized to further decrease contamination during analyses of samples with carbon amounts of up to ∼50 μg. With these improvements, we now report low constant contamination levels of 0.62 ± 0.12 μg C (with F 14 C of 0.19 ± 0.04), whereas the cross contamination factor was determined to be 0.25 ± 0.07

Absolute dating · Carbon fibers · Mineralogy · Organic matter · Radiocarbon dating · Total organic carbon · Archaeology and ancient environmental studies · Chemistry · Environmental Science · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Materials Science · Environmental Chemistry · Geology · Organic Chemistry · Paleontology

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