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Studies on environmental contamination by uranium. 4. Uranium absorption by Chinese cabbage.

Uranium absorption in the leaves of Chinese cabbage were studied under water and soil cultures. In water culture, Chinese cabbage was cultivated for 7 days at various pH of the cultivating medium containing various amount of uranium. As the concentration of both uranium ions (uranyl ion and uranyl-carbonate complex anion) in the medium increased and as pH of the medium increased, there was an increase in the uranium content of the leaves. There was no significant difference in the absorption by Chinese cabbage between uranyl ion and uranyl-carbonate complex anion. In soil culture, Chinese cabbage was grown on volcanic ash, sandy and alluvial soils which adsorbed varied amounts of uranium. As uranium content of a soil was raised, the amount of uranium transferred to the leaves increased. The uranium content in the leaves decreased during their growth and its decline was generally exponential against days after sowing.