Williams, ionic processes

The chemistry of aluminium combines features in common with two other groups of elements, namely (i) divalent magnesium and calcium, and (ii) trivalent chromium and iron (Williams, 1999). It is likely that the toxic effects of aluminium are related to its interference with calcium directed processes, whereas its access to tissues is probably a function of its similarity to ferric iron (Ward and Crichton, 2001). The effective ionic radius of Al3+ in sixfold coordination (54 pm) is most like that of Fe3+ (65 pm), as is its hydrolysis behaviour in aqueous solution ... 

Figure 17 Plots equivalent of Kielland coefficients (top) and (in K j)j (bottom) values versus effective crystal ionic radii (EIR) for C-SbA The values of EIR are taken from Ref. 115. Exchanger, 0.10 g total volume, 10.0 cm temp., 30X ionic strength, 0.1 (MNOj + HNOj) or (MNOj + MOH), M = U, Na, K, Rb, and Cs. (From M. Abe, in Ion Exdtange Processes Advances and Applications (A Dyer, M. J. Hudson, and P. A. Williams, eds.). The Royal Society of Chemistry, Science Park, Cambridge, UK, p. 199, 1993. With permission.)...

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