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SZC average pore size relative to the ionic diameters of several common cations (a) and illustration of the SZC-binding site showing the average binding site diameter of ∼3 Å (b). With similar nonhydrated ionic diameters, K+ and NH4+ fit best within the SZC binding site. Ca2+, calcium; H3O+, hydronium; K+, potassium, Mg2+, magnesium; Na+, sodium; NH4+, ammonium; SZC, sodium zirconium cyclosilicate.
