Technetium and Uranium

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Abstract
The effects of Tc and Ur on the yield and uptake and identification of the organ of accumulation of an edible leafy vegetable growing in sandy and peaty soils were determined. In sand, where the soil''s sorption capacity was negligible, Tc uptake was 4 orders of magnitude higher than from peat, suggesting no plant mediation of uptake and a constant concentration factor (> 50) in an oxidizing environment where Tc was continuously supplied. The Tc was predominantly translocated to the shoots. When soil fixation occurred, as in peat, this became the controlling factor in the plant uptake of Tc. In the case of Ur, plant mediation was more significant. Ur uptake by Swiss chard was up to 80-fold higher from sand than from peat. The Ur was restricted to the root system and may have been only precipitated on the outer root membrane and not accumulated in the roots.

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