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Biologically induced Po emission from fresh water
N Momoshima1, L i X Song, S Osaki
1Department of Chemistry and Physics of Condensed Matter, Graduate School of Science, Kyushu University, Fukuoka, Japan. momoenv@aster.sci.kumamoto-u.ac.jp
Journal of Environmental Radioactivity
|October 5, 2002
Summary
Polonium (Po) compounds volatilize from freshwater, with emission increasing due to microbial activity and nutrient addition. This suggests biological processes drive atmospheric Po release in both freshwater and marine environments.
Area of Science:
- Environmental Chemistry
- Geochemistry
- Microbiology
Background:
- Polonium (Po) behavior in aquatic systems is not fully understood.
- Previous studies focused on marine environments, leaving freshwater systems less explored.
Purpose of the Study:
- To investigate the emission behavior of polonium (Po) from freshwater environments.
- To explore the role of microbial communities in Po volatilization and atmospheric emission.
Main Methods:
- Laboratory culture experiments using freshwater samples from diverse sources.
- Addition of nutrients (tryptone, NaHCO3) to assess microbial and photosynthetic influences.
- Monitoring of volatile Po compound formation and emission to air.
Main Results:
- Volatile Po compounds were formed and emitted to the air from freshwater cultures.
- Tryptone addition significantly increased Po emission, correlating with microbial growth (chemoheterotrophs).
- NaHCO3 addition also enhanced Po emission, suggesting photoautotroph involvement.
Conclusions:
- Biological processes, involving both chemoheterotrophs and photoautotrophs, significantly influence Po emission from freshwater.
- Freshwater environments, similar to marine ones, can be a source of atmospheric polonium.
- The findings highlight the general biological support for Po emission across aquatic environments.