Influence of microbial activity on technetium behavior in soil under waterlogged condition

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:382874

Tagami, K; Uchida, S ^[1]

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1. National Inst. of Radiological Sciences, Nakaminato, Ibaraki (Japan). Div. of Radioecology

The behavior of Tc in soil depends upon its chemical forms. Under aerobic conditions, Tc is present as pertechnetate Tc{sup +7} (TcO{sub 4}{sup {minus}}), which has a high geochemical mobility and bioavailability. However, the form changes through a combination of factors such as redox conditions and microbial activity in soils. The anaerobic condition can be supplied in waterlogged rice paddy soil, which is common to Japan and other Southeast Asian countries. In this study, the authors focused on the influence of microbial activity on Tc behavior in soil under the waterlogged condition. The microbial activity is expected to be controlled by addition of glucose and the activity causes a change in the soil redox condition. Air-dried soil with increasing glucose contents and sterile soil were used to compare the effect of microbial activity.The soils were waterlogged with {sup 99}Tc solution. Although the concentrations of {sup 99}Tc in the surface and bottom solutions of air-dried soils decreased over time with increasing glucose concentration, those of sterile soils were almost constant during the experiment. From these results, it was assumed that the activity of microorganisms influenced Tc adsorption onto the soil.

• OSTI ID: 382874
• Report Number(s): CONF-941075--; ISBN 1-55899-253-7
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ADSORPTION
BIOLOGICAL AVAILABILITY
EXPERIMENTAL DATA
FUEL REPROCESSING PLANTS
GEOCHEMISTRY
MICROORGANISMS
NUCLEAR MEDICINE
NUCLEAR POWER PLANTS
NUCLEAR WEAPONS
RADIOACTIVE WASTE FACILITIES
RICE
SOIL CHEMISTRY
SOILS
SORPTIVE PROPERTIES
TECHNETIUM
TECHNETIUM 99
TESTING
WATER SATURATION