Transference Kinetics of Radionuclide <sup>95</sup>Nb in the Aquatic Ecosystem
- 1 School of Pharmaceutical Engineering and Life Science, Changzhou University, Changzhou, China
- 2 Institute of Nuclear Agricultural Sciences, Zhejiang University, Key Laboratory of Nuclear Agricultural Science, Ministry of Agricultural, Hangzhou, China
- 3 School of Pharmaceutical Engineering and Life Science, Changzhou University, Changzhou, China
- 4 Institute of Nuclear Agricultural Sciences, Zhejiang University, Key Laboratory of Nuclear Agricultural Science, Ministry of Agricultural, Hangzhou, China
Abstract
The dynamics of transportation, accumulation, diminishment and distribution of 95 Nb in a simulated aquatic ecosystem was studied using the isotope-tracer technique, and a fitting equation was established by application of a closed, five-compartment model. The results showed that when 95 Nb was introduced into an aquatic system, it was transported and transformed via deposition in combination with other ions, and adsorption and absorption by aquatic organisms, resulting in redistribution and accumulation in different parts of the organisms. Following addition, the spe- cific activity of 95 Nb in water decreased sharply within a short time, and then after reaching a certain value, it decreased more slowly. Sediment accumulated large amounts of 95 Nb through the exchange of ions. Hyacinth ( Eichhornia crassipes ) also adsorbed a large amount of 95 Nb in a short period of time. Snails ( Bellamya purificata ) and fish ( Carassius auratus ) were found to have a poor adsorption capacity of 95 Nb. The amount of 95 Nb found in the snail flesh was greater than that in the shell, and the 95 Nb found in the fish was mainly distributed in the viscera. The amount of 95 Nb in each individual component of the experimental system was affected over time.
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