Journal
SCIENTIFIC REPORTS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep05856
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Funding
- National Science Council and the Ministry of Education of Taiwan, ROC [NSC 101-2611-M-110-012]
- DOE [02C030203]
- US National Heart, Lung, and Blood Institute [1R15HL095039]
- US National Science Foundation [CBET-0932404]
- California Sea Grant [R/CONT-213EPD]
- UC CITRIS Program
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0932404] Funding Source: National Science Foundation
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An increase in ambient carbonaceous particle (CNP) levels has been found, potentially leading to significant environmental/health hazards. These particles will ultimately enter the oceanic environment and interact with dissolved organic carbon. However, a detailed mechanistic understanding of their behavior, transport, and fate in marine systems is still much needed. This study, using carbon black (CB, 14 nm) nanoparticles as a model, aimed to investigate the impact of CNPs on marine microgel formation, a critical shunt between DOC and particulate organic carbon that potentially represents a similar to 70-Gt organic carbon flux. We found that CB can enhance the stability of DOC polymers and reduce microgel equilibrium sizes in concentration as low as 1 mu gL(-1) CB, possibly due to negative surface charges on CB that decrease cross-linking bridges through Ca2+ bonds. The reduction of marine microgel formation induced by CB could lead to a decrease in the downward transportation of microbial substrates and nutrients, and therefore, could have a significant impact on the carbon cycle and the marine ecosystem.
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