Journal
ORGANIC GEOCHEMISTRY
Volume 135, Issue -, Pages 11-15Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2019.06.006
Keywords
Dissolved organic carbon; Delta C-14; UV irradiation; Oxidation time; Mixing model
Categories
Funding
- Excellent Young Researchers Overseas Visit Program from the Japan Society for the Promotion of Science
- NSF [1457549, 1840243]
- Direct For Biological Sciences
- Division Of Environmental Biology [1457549] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1840243] Funding Source: National Science Foundation
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Dissolved organic carbon (DOC) plays a major role in aquatic carbon cycling. In order to determine if DOC photolability was related to DOC age, we tested the effect of oxidation time using UV irradiation on natural radiocarbon concentrations (Delta C-14) of DOC in six US rivers. The most photo-labile DOC was C-14 youngest. After a 100 min UV irradiation, most DOC (>93%) was oxidized in two out of the six rivers studied. On the other hand, the other four rivers still had a considerable amount (>20%) of DOC resistant to UV oxidation, which showed lower Delta C-14 values than those of bulk DOC. We also found that the concentration and Delta C-14 value of bulk DOC are controlled by the photochemically intermediate fraction. The results suggest that C-14 age of organic matter is not homogeneous within DOC, the degree of which may depend on the characteristics unique to rivers. (C) 2019 Elsevier Ltd. All rights reserved.
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