A new UV-Oxidation set up for AMS radiocarbon analysis of small dissolved organic carbon in marine and freshwater samples

Dr Negar Haghipour1,2, Dr Maarten Lupker2, Dr Lukas Wacker1, Prof. Timothy Eglinton2

1Laboratory of Ion Beam Physics, ETHZ, Zurich, Switzerland, 2Geological Institute, ETHZ, Zurich, Switzerland

Radiocarbon measurements of dissolved organic carbon (DOC) is a powerful tool in global carbon cycle studies in the ocean and river systems. The main challenge of UV-Oxidation (UVox) methods is to obtain sufficient DOC with low blanks required for high precision 14C measurement specially in sea water samples. Another disadvantages of currently used UVox methods in the most of laboratories is that only one sample can be oxidized at the same time.
Here we present a UV-Oxidation system with 12 quartz reactors where multiple water samples can be oxidized simultaneously in a compact setup which significantly reduces the processing time. In comparison to the other laboratories no vacuum line is connected to this new UVox setup. To test the oxidation efficiency, reproducibility and blank assessment we used different reference materials and sample type. Here we discuss the preliminary results from the performance of UVox extraction line and compare the data with oxidation methods currently being used in other laboratories.


Biography:

I’m lab coordinator at ETH Zurich. As an earth scientists trained in tectonic geomorpholgy and geochronology.
My main interest is using radiocarbon and cosmogenic nuclides in different field of geosciences.

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Date

Nov 08 - 19 2021