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Bridging microbial diversity and chemodiversity of dissolved organic matter to better constrain processes in biogeochemical cycles
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Oxidation of dissolved organic carbon by low-wattage ultraviolet irradiation for isotopic analysis
P-M4-05-S
Jin-Jia Liang* , Department of Oceanography, National Sun Yat-
Sen University
George. S. Burr, Department of Oceanography, National Sun Yat-
Sen University
Yu-Shih Lin, Department of Oceanography, National Sun Yat-
Sen University
Presenter Email: ss0800449tw@gmail.com |
| Dissolved organic carbon (DOC) is the largest pool of reduced carbon in the oceans, with the pool size nearly equal to that of atmospheric CO2. Stable carbon isotopic values (¦Ä13C) of DOC provide insights into the source and bioavailability of this important carbon pool, but due to its dissolved nature and coexistence with salts, there are few simple methods for accurate measurement. Photochemical oxidation, with high-wattage mercury ultraviolet irradiation being the prevailing approach, offers the advantages of low background carbon and high recovery. However, the accompanying hazardous substances pose health and safety issues for laboratory personnel. Here, we attempt to develop a new and user-friendly method that involves the combined use of low-wattage UV irradiation and chemical oxidants at a trace level. Our preliminary results show that with this approach, an oxidation efficiency of ~65% can be achieved within 1.5 hr for DOC in surface seawater. Further optimization work, such as lowering of background carbon and improvement of recovery, is currently in progress.
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