| Popis: |
A procedure for pH-metric determination of the limiting adsorption of OH groups (AOH) by FeIII, ZrIV, CrIII, and InIII oxyhydroxide hydrogels from 0.1 and 1.0 M solutions of NaCl is described. Data on the molecular area occupied by a single OH group on the hydrogel surface (SOH) and the Sspec values, which were calculated from AOH and SOH, are presented. The Sspec value does not depend on the pH of hydrogel precipitation; the true Sspec value can be determined only from sorption of the OH groups at the actual point of zero charge of the hydrogel. The AOH values for hydrogels were found to change only slightly during aging of hydrogels in electrolyte solutions. |
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