Sheppard M I, Vandergraaf T T, Thibault D H, Reid J A
Health Phys. 1983 Jun;44(6):635-43. doi: 10.1097/00004032-198306000-00004.
The objectives of this study were to compare the effects of technetium and uranium on the yield and uptake, and to identify the organ of accumulation, of an edible leafy vegetable growing in sandy and peaty soils. In sand, where the soil's sorption capacity is negligible, technetium uptake is four orders of magnitude higher than from peat, suggesting no plant mediation of uptake and thus a constant concentration factor (greater than 50) in an oxidizing environment where technetium is continuously supplied. The technetium is predominantly translocated to the shoots. When soil fixation occurs, as in peat, this becomes the controlling factor in the plant uptake of technetium. In the case of uranium, plant mediation is more significant. Uranium uptake by Swiss chard is up to 80 times higher from sand than from peat. The uranium is restricted to the root system and may only be precipitated on the outer root membrane and may not accumulate in the roots.
本研究的目的是比较锝和铀对一种叶用蔬菜在沙质土壤和泥炭土中产量及吸收量的影响，并确定其积累器官。在沙质土壤中，由于土壤的吸附能力可忽略不计，锝的吸收量比在泥炭土中高四个数量级，这表明在锝持续供应的氧化环境中，植物对锝的吸收没有调节作用，因此存在恒定的浓缩系数（大于50）。锝主要转移到地上部分。当像在泥炭土中那样发生土壤固定时，这就成为植物吸收锝的控制因素。就铀而言，植物的调节作用更为显著。瑞士甜菜从沙质土壤中吸收的铀比从泥炭土中高80倍。铀局限于根系，可能仅沉淀在根外膜上，而不会在根部积累。
