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The grafting of ligands upon a surface within a chelating ion exchanger provides an excessive concentration of the ligand within a relatively small volume of the bonded layer, which metal ions from the bulk solution or mobile phase need to reach for any interaction to occur. 6 diﬀusion processes are faster in macro-porous adsorbents with lower amounts of grafted groups, and smaller particle size. For example, with 3-aminopropyl and 3-mercaptopropyl modiﬁed silica the apparent diﬀusion coeﬃcients of Co(II) and Hg(II) were found to be much lower (1000–10 000 times) than those obtained in homogeneous solutions.
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