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Area of Science:

  • Environmental Science
  • Oceanography
  • Nanotechnology

Background:

  • Rising ambient carbonaceous particle (CNP) levels pose environmental and health risks.
  • CNPs interact with oceanic dissolved organic carbon (DOC), but their marine fate is poorly understood.
  • Marine microgels are a critical link between DOC and particulate organic carbon, representing a significant carbon flux.

Purpose of the Study:

  • To investigate the impact of carbonaceous nanoparticles (CNPs) on marine microgel formation.
  • To use carbon black (CB) nanoparticles as a model to understand CNP-DOC interactions.
  • To elucidate the mechanistic effects of CNPs on microgel stability and size.

Main Methods:

  • Utilized carbon black (CB, 14 nm) nanoparticles as a model CNP.
  • Measured changes in microgel formation and stability in the presence of varying CB concentrations.
  • Analyzed the role of CB surface charge and Ca(2+) bridging in microgel dynamics.

Main Results:

  • CB enhanced the stability of dissolved organic carbon (DOC) polymers.
  • Microgel equilibrium sizes were reduced at CB concentrations as low as 1 μg L⁻¹.
  • Negative surface charges on CB likely decrease Ca(2+) cross-linking, inhibiting microgel formation.

Conclusions:

  • CNPs significantly influence marine microgel formation, reducing their size and stability.
  • Reduced microgel formation may decrease downward transport of microbial substrates and nutrients.
  • These findings highlight the potential impact of CNPs on the marine carbon cycle and ecosystem health.