Behavior of technetium in freshwater environments
In a previous study, /sup 95m/Tc, as a pertechnetate, was released to a small, experimental, freshwater pond, and the concentrations were determined in biotic and abiotic components of the pond ecosystem. A simple mathematical model was developed to predict the concentration of /sup 95m/Tc in fish and snails. Results from this study indicated that uptake through the food chain was an important source of technetium to the higher trophic levels (i.e., fish). In the current study, an experimental pond was spiked with /sup 95m/Tc in the pertechnetate form, and the concentrations of /sup 95m/Tc were measured in the lower trophic levels. Emphasis was placed on measuring the concentration of /sup 95m/Tc in zooplankton, benthic invertebrates, and the aquatic macrophyte Elodea canadensis. Fish were excluded from the pond to allow the development of a large zooplankton population. The concentration of /sup 95m/Tc in water decreased from 0.75 Bq/mL 1 h after the pond was spiked, to 0.21 Bq/mL at 20 d. Throughout the experiment, at least 98% of the /sup 95m/Tc in the water was in the dissolved fraction (0.4 ..mu..m). Zooplankton accumulated /sup 95m/Tc rapidly, having concentration factors (Bq/g sample wet wt. divided by Bq/g water) ranging from 3 at 4 h to 36 at 20 d. Concentration factors ranged from 3 to 8 for benthic insects and from 1 to 62 for the aquatic macrophyte.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6386319
- Report Number(s):
- CONF-8410157-1; ON: DE85000274
- Resource Relation:
- Conference: Scientific seminar on the behavior of technetium in the environment, Cadarache, France, 23 Oct 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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AQUATIC ECOSYSTEMS
RADIONUCLIDE MIGRATION
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BIOLOGICAL ACCUMULATION
AQUATIC ORGANISMS
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EXPERIMENTAL DATA
ISOMERIC NUCLEI
PLANTS
PONDS
RADIOECOLOGICAL CONCENTRATION
TECHNETIUM 99
TRACER TECHNIQUES
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ENVIRONMENTAL TRANSPORT
HOURS LIVING RADIOISOTOPES
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ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
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MASS TRANSFER
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
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520300* - Environment
Aquatic- Radioactive Materials Monitoring & Transport- (1989)