期刊
WATER RESEARCH
卷 131, 期 -, 页码 161-166出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2017.12.030
关键词
Dissolved organic matter; Microgel; Particulate organic matter; Self-assembly; Riverine organic matter
资金
- Ministry of Science and Technology
- Ministry of Education of Taiwan, ROC [MOST 104-2611-M-110-019, DOE 01C030703]
- Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan [KMU-TP105A11, KMU-TP105A29]
Rivers drive large amounts of terrestrial and riverine organic matter into oceans. These organic materials may alter the self-assembly of marine dissolved organic matter (DOM) polymers into microgels and can even affect the behavior of existing natural microgels. We used Suwannee River humic acid, fulvic acid, and natural organic matter as a model of riverine organic matter (ROM) to investigate the impacts of ROM input on DOM polymer and microgel conversion. Our results indicated that the release of extra ROM, even at low concentrations (0.1-10 mg L-1), into the marine organic matter pool decreased the size of self-assembled DOM polymers (from 4-51 mu m to < 1 mu m) and dispersed the existing natural microgels into smaller particles (from 4-5 mu m to 2-3 mu m). The particle size of the microgel phase was also less sensitive than that of the DOM polymers to external changes (addition of ROM). This size reduction in DOM aggregation and existing microgels may be closely tied to the surface chemistry of the organic matter, such as negative surface charge stabilization and Ca2+ cross-linking bridges. These findings reveal that ROM inputs may therefore impede the self-assembly of DOM polymers into particulate organic matter and reduce the sedimentation flux of organic carbon and other elements from surface water to the deep ocean, thereby disturbing the biological pump, the downward transportation of nutrients, and the marine organic carbon cycle. (C) 2017 Elsevier Ltd. All rights reserved.
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