An Alternate Method of Diluting Dissolved Organic Carbon Seawater Samples for 14C Analysis
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CitationGriffin, S., Beaupré, S. R., & Druffel, E. R. M. (2010). An alternate method of diluting dissolved organic carbon seawater samples for 14C analysis. Radiocarbon, 52(3), 1224-1229.
DescriptionFrom the 20th International Radiocarbon Conference held in Kona, Hawaii, USA, May 31-June 3, 2009.
AbstractWe present a time-saving modification to the ultraviolet (UV) oxidation method for analyzing dissolved organic carbon (DOC) concentration, ∆14C, and 13C measurements in seawater and standard materials. A low background (~0.2 +/- 0.2 M) was reported for pre-irradiated Milli-Q (MQ) water that was used to dilute samples for DOC 14C analysis (Beaupr et al. 2007). We use MQ water without pre-irradiation (background ~0.9 0.2 M) 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 ∆14C measurements (5-9) is maintained. This revised method reduces the preparation time for diluted DOC ∆14C samples from 2 days to 1 day.