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Total Uncertainty of Radiocarbon Measurements of Marine Dissolved Organic Carbon and Methodological Recommendations
| Content Provider | Scilit |
|---|---|
| Author | Druffel, Ellen R. M. Griffin, Sheila Walker, Brett D. Coppola, Alysha I. Glynn, Danielle S. |
| Copyright Year | 2013 |
| Description | We report results of duplicate measurements of dissolved organic carbon concentrations ([DOC] as μM) and $Δ^{14}$C in seawater in order to assess the total uncertainty of reported [DOC] and $Δ^{14}$C measurements via the UV oxidation method. In addition, pure International Atomic Energy Agency standards analyzed over a 4-yr period are evaluated. We find the total uncertainty of $Δ^{14}$C measurements to be ±4.0. However, in samples that were thawed, subsampled, and refrozen prior to UV oxidation, the total uncertainty of $Δ^{14}$C measurements is on the order of ±10. The [DOC] measurements of these samples were also higher by 1.8 ± 0.3 μM. The reason(s) for these documented increases in total [DOC] and $Δ^{14}$C uncertainty are unclear. In order to minimize any effects on sample measurements, we recommend the following: 1) regular monitoring of duplicate samples, DOC standards, and diluent (Milli-Q™) water for $Δ^{14}$C and [DOC] measurements; 2) thawing a sample immediately and only once prior to UV oxidation; 3) avoid the use of DOC-leachable plumbing (such as PVC pipe) in both water systems feeding and within Milli-Q systems; and 4) consider the use of DOC-free diluents (i.e. pre-UV oxidized Milli-Q or sample water). |
| Related Links | https://escholarship.org/content/qt2gp960bt/qt2gp960bt.pdf?t=nfed24 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/B9C84038FEAFF4359226B5B0F15B0DDC/S0033822200048049a.pdf/div-class-title-total-uncertainty-of-radiocarbon-measurements-of-marine-dissolved-organic-carbon-and-methodological-recommendations-div.pdf |
| Ending Page | 1141 |
| Page Count | 7 |
| Starting Page | 1135 |
| ISSN | 00338222 |
| e-ISSN | 19455755 |
| DOI | 10.1017/s0033822200048049 |
| Journal | Radiocarbon |
| Issue Number | 3 |
| Volume Number | 55 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2013-01-01 |
| Access Restriction | Open |
| Subject Keyword | Radiocarbon |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences Archeology (arts and humanities) |
