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Total Uncertainty of Radiocarbon Measurements of Marine Dissolved Organic Carbon and Methodological Recommendations
| Content Provider | eScholarship Repository: University of California |
|---|---|
| Author | Druffel, Ellen Griffin, Sheila Walker, B. D. Coppola, A. I. Glynn, D. S. |
| Abstract | We report results of duplicate measurements of dissolved organic carbon concentrations ([DOC] as µM) and Δ14C in seawater in order to assess the total uncertainty of reported [DOC] and Δ14C 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 Δ14C measurements to be ±4.0‰. However, in samples that were thawed, subsampled, and refrozen prior to UV oxidation, the total uncertainty of Δ14C 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 Δ14C 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 Δ14C 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). |
| File Format | |
| ISSN | 00338222 |
| DOI | 10.2458/azu_js_rc.55.16305 |
| Alternate Webpage(s) | https://escholarship.org/uc/item/55x4m85d |
| Journal | Radiocarbon |
| Issue Number | 3â4 |
| Volume Number | 55 |
| Language | English |
| Publisher Date | 2013-01-01 |
| Access Restriction | Open |
| Rights License | https://creativecommons.org/licenses/by/4.0/ |
| Subject Keyword | Dissolved Organic Carbon Marine Carbon Cycle Physical Sciences and Mathematics DOC |
| Content Type | Text |
| Resource Type | Article |
| Subject | Mathematics |
