Biogeochemical studies of technetium in marine and estuarine ecosystems. Progress report, 1 July 1979-30 June 1980
Progress is reported in research dealing with the biogeochemical behavior of technetium in marine and estuarine ecosystems. Studies were planned to elaborate the biokinetic behavior of Tc as TcO/sub 4//sup -/ in selected marine and estuarine organisms and to determine the affinity of TcO/sub 4//sup -/ for different marine sediments under oxygenated conditions. It is concluded that concentration factors for TcO/sub 4//sup -/ in bivalve molluscs (oysters and mussels) do not exceed 2 when calculated for whole animals and when uptake is directly from water. Direct uptake from water by limpets (archeogastropod) are very much lower than have been reported for red abalone (archeogastropod). Whole body concentration factors for TcO/sub 4//sup -/ in the plaice, Pleuronectes platessa, where uptake is directly from labeled seawater, do not exceed 10 at equilibrium. Both the lobster, Homarus gammaris and the polychaete, Nereis diversicolor appear to concentrate Tc efficiently from water labelled intially with TcO/sub 4//sup -/. Both plaice and rays (Raja clavata) fed /sup 95m/Tc labeled Nereis show an initial rapid loss of the isotope for approximately five days. Thereafter, loss is much reduced. Shrimp (Palaemon elegans), Cragnon sp.) and Crab (Cancer pagurus) show concentration factors similar to plaice (C.F. is less than 10). Isopods, however, have concentration factors of only 3 following four weeks exposure to labeled seawater. Uptake of TcO/sub 4//sup -/ by phytoplankton is extremely low, which precludes experiments in which TcO/sub 4//sup -/ labeled phytoplankton can be fed to either bivalve molluscs or microzooplankton. Sediment distribution coefficients for TcO/sub 4//sup -/ are essentially zero and are independent of sediment type in well oxygenated seawater. Experiments to date have shown that it is not possible to make generalizations concerning the bioavailability of TcO/sub 4//sup -/ to marine organisms.
- Research Organization:
- Oregon State Univ., Newport (USA). Marine Science Center
- DOE Contract Number:
- AT06-79EV10251
- OSTI ID:
- 5180251
- Report Number(s):
- DOE/RL/02227-1; TRN: 80-014803
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AQUATIC ECOSYSTEMS
RADIONUCLIDE MIGRATION
TECHNETIUM
RADIOECOLOGICAL CONCENTRATION
AQUATIC ORGANISMS
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL ACCUMULATION
ESTUARIES
FISHES
LABELLED COMPOUNDS
LOBSTERS
MOLLUSCS
PHYTOPLANKTON
RADIONUCLIDE KINETICS
RESEARCH PROGRAMS
SEAWATER
TECHNETATES
TECHNETIUM 95
UPTAKE
ANIMALS
ARTHROPODS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CRUSTACEANS
DAYS LIVING RADIOISOTOPES
ECOLOGICAL CONCENTRATION
ECOSYSTEMS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
ENVIRONMENTAL TRANSPORT
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INVERTEBRATES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KINETICS
MASS TRANSFER
METALS
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PLANKTON
RADIOISOTOPES
REACTION KINETICS
REFRACTORY METALS
SURFACE WATERS
TECHNETIUM COMPOUNDS
TECHNETIUM ISOTOPES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERTEBRATES
WATER
520302* - Environment
Aquatic- Radioactive Materials Monitoring & Transport- Aquatic Ecosystems & Food Chains- (-1987)