Abstract
THE removal of stable or radioactive toxic elements from the human body is of considerable interest1. The modification of tissue distribution and excretion of metal ions by chelating agents has been studied in man and animals in several laboratories2. Although ethylenediamine tetraacetic acid has been the most effective chelating agent thus far studied, it has the disadvantage that relatively large doses are required in order to effect a significant removal of heavy metal ions, particularly radioactive rare earths. Therefore metal chelates having stability constants higher than the corresponding metal chelates of ethylenediamine tetraacetic acid were investigated for their effectiveness in removal of rare earth elements.
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