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An Alternate Method of Diluting Dissolved Organic Carbon Seawater Samples for 14C Analysis

Published online by Cambridge University Press:  18 July 2016

Sheila Griffin ,
Steven R Beaupré  and
Ellen R M Druffel
Sheila Griffin*
Affiliation:
Department of Earth System Science and Keck Carbon Cycle AMS Laboratory, University of California, Irvine, California 92697-3100, USA
Steven R Beaupré
Affiliation:
Department of Earth System Science and Keck Carbon Cycle AMS Laboratory, University of California, Irvine, California 92697-3100, USA
Ellen R M Druffel
Affiliation:
Department of Earth System Science and Keck Carbon Cycle AMS Laboratory, University of California, Irvine, California 92697-3100, USA
*
Corresponding author. Email: sgriffin@uci.edu.
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Abstract

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We present a time-saving modification to the ultraviolet (UV) oxidation method for analyzing dissolved organic carbon (DOC) concentration, Δ14C, and δ13C measurements in seawater and standard materials. A low background (∼0.2 ± 0.2 μM) was reported for pre-irradiated Milli-Q (MQ) water that was used to dilute samples for DOC 14C analysis (Beaupré et al. 2007). We use MQ water without pre-irradiation (background ∼0.9 ± 0.2 μM) to dilute the sample. This method is suitable for small-volume, high-concentration samples (mass of sample DOC overwhelms mass of MQ water DOC). An acceptable precision of Δ14C measurements (5–9‰) is maintained. This revised method reduces the preparation time for diluted DOC Δ14C samples from 2 days to 1 day.

Type
Marine
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1224 - 1229
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

References

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