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- W1576587741 abstract "Adsorption densities of supporting electrolyte ions onto γ-Al2O3 were measured using a radioisotopic method. The measurements were performed in NaCl, CsCl, and NaI solutions of concentrations ranging from 0.0001 to 1.0 M. The isotopes 22Na, 137Cs, 36Cl, and 131I were used. The surface complexation constants of anion and cation were estimated: p∗KNa+int = 8.6, p∗KClint = 7.5, and ΔpKcomplex = 1.1. The potential distribution within the electrical double layer and C2 capacity were also evaluated using potentiometric titration and electrokinetic data. It was found that the complete results are inconsistent if ΔpKa = 6.2. It was presumed that hitherto existing methods of determination of surface ionization constants can be the reason for this inconsistency. The new concept of pKa1,a2int determination from adsorption measurements is presented in detail. It was estimated that pKa1int ⩾ 6.0 ± 0.2, pKa2int ⩽ 10.2 ± 0.2, and ΔpKa ⩽ 4.2 ± 0.4. Using ΔpKa = 4.2 the surface potential and ionic components of surface charge were determined vs pH. The capacitances C1 and C2 were also estimated for differing ionic strengths as a function of pH." @default.
- W1576587741 created "2016-06-24" @default.
- W1576587741 creator A5086930754 @default.
- W1576587741 date "1989-01-01" @default.
- W1576587741 modified "2023-09-27" @default.
- W1576587741 title "Electrical double layer at alumina/electrolyte interface" @default.
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- W1576587741 doi "https://doi.org/10.1016/0021-9797(89)90003-9" @default.
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