The relationship of chelating agents, both synthetic and natural, to the bio-accumulation of heavy metal radionuclides and potentially toxic heavy metals has been sought in recent studies.nThis same characteristic of DXPA cakes it useful in decontamination both in bodies and in the environment. In soils in which the potentially toxic heavy metal or radio¬nuclide may be, the pH of the soil is of great consequence in the amount of the nuclide absorbed by the plants. This is largely because of the stability constant of the metal chelate which is pH dependent. At the pH where metal chelate is most stable, most metal is accumulated by the plant. This situation obtains unless there is a relatively large excess of the chelating agent where at least for some elements and some plants competition reactions occur.
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