| http://www.w3.org/ns/prov#value | - This suggests that a macrocyclic host molecule having a nearly coplanar arrangement of either five or six ligand groups would act as a specific ligand for (i.e., as an uranophile).In order to design a ligand that can selectively extract , one has to overcome a difficult problem, that is, the ligand must discriminate strictly between and other metal ions present in great excess in water or waste so
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