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Accumulation of Th, Pb, U, and Ra in Marine Phytoplankton and its Geochemical Significance

Fisher, N. S. ; J.-L. Teyssie ; Krishnaswami, S. ; Baskaran, M.

Limnol. Oceanogr.; (United States), 1987-01, Vol.32 (1), p.131-142 [Periódico revisado por pares]

Waco, TX: American Society of Limnology and Oceanography

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Título:
Accumulation of Th, Pb, U, and Ra in Marine Phytoplankton and its Geochemical Significance
Autor: Fisher, N. S. ; J.-L. Teyssie ; Krishnaswami, S. ; Baskaran, M.
Assuntos: 560162 - Radionuclide Effects, Kinetics, & Toxicology- Animals, Plants, Microorganisms, & Cells ; ACTINIDE ISOTOPES ; ACTINIDE NUCLEI ; ALGAE ; ALKALINE EARTH ISOTOPES ; ALPHA DECAY RADIOISOTOPES ; Animal and plant ecology ; Animal, plant and microbial ecology ; AQUATIC ORGANISMS ; Autoecology ; BETA DECAY RADIOISOTOPES ; BETA-MINUS DECAY RADIOISOTOPES ; BIOLOGICAL ACCUMULATION ; Biological and medical sciences ; CHEMISTRY ; Cyanophyta ; DAUGHTER PRODUCTS ; DIATOMS ; Earth ; EVEN-EVEN NUCLEI ; Fundamental and applied biological sciences. Psychology ; GEOCHEMISTRY ; HEAVY NUCLEI ; ISOTOPES ; LEAD 210 ; LEAD ISOTOPES ; Marine ; NUCLEI ; Nuclides ; Oceans ; Particulate matter ; PHYTOPLANKTON ; PLANKTON ; PLANTS ; Plants and fungi ; RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT ; RADIOISOTOPES ; RADIONUCLIDE KINETICS ; Radionuclides ; RADIUM 228 ; RADIUM ISOTOPES ; Sea water ; Surface water ; THORIUM 228 ; THORIUM ISOTOPES ; URANIUM 232 ; URANIUM ISOTOPES ; YEARS LIVING RADIOISOTOPES ; Zooplankton
É parte de: Limnol. Oceanogr.; (United States), 1987-01, Vol.32 (1), p.131-142
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: The bioaccumulation of U, Th, Ra, and Pb in four diverse nanoplanktonic algal species and a picoplanktonic blue-green alga was determined with radiotracers. Among the nanoplankton differences of 1-2 orders of magnitude in volume/volume concentration factors (VCFs) were observed for a given nuclide, but larger differences were observed among the four nuclides, with VCF values of$Th>Pb>Ra\thicksimeq U$. The picoplankton cells, with greater surface: volume ratios, had significantly higher VCF values. The mean VCF values in the nanoplankton of Th and Pb were 1.5 × 105and 3.6 × 104in the light and 2.8 × 105and 7.3 × 104in the dark. The VCFs of Th and Pb in the picoplankton were both about 2 × 106, irrespective of light. Retention half-times of228Th and210Pb in fecal pellets of Artemia salina, fed radiolabeled diatoms, were 20-50 d, but >120 d for228Th at 4⚬C. The results suggest that sinking plankton and their debris could account for most of the natural series radionuclides sedimenting out of oceanic surface waters.
Editor: Waco, TX: American Society of Limnology and Oceanography
Idioma: Inglês

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Accumulation of Th, Pb, U, and Ra in Marine Phytoplankton and its Geochemical Significance

Fisher, N. S. ; J.-L. Teyssie ; Krishnaswami, S. ; Baskaran, M.

Waco, TX: American Society of Limnology and Oceanography

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