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Backtitration Technique for Proton Isotherm Modeling of Oxide Surfaces¹

ABSTRACT

Batch potentiometric titration analyses were made on a -Al₂O₃ colloidal suspension and interpreted in terms of the electroneutrality principle. Three titration methods involving a singular reference curve were compared. The first reference used was theoretical, the latter two were representative supernatant curves: an electrolyte solution, and an aliquot of the zero point of titration (ZPT) supernatant. All three methods resulted in similar charge isotherms and a zero point of charge (ZPC) = 8.60. A fourth titration method was developed involving each supernatant of the batch titration sample to act as a unique reference. This latter method is a backtitration technique which accounts for all sources that also consume H⁺ ions, leaving the difference to be the adsorbed proton concentration only. The NaClO₄ electrolyte solution used is postulated to be adsorbed with competitive cation and anion exchange mechanisms with a point of zero salt effect (PZSE) = 7.50.

¹ Published with the approval of the Director of the Delaware Agric. Exp. Stn. as Miscellaneous Paper no. 1121 Contribution no. 199 of the Dep. of Plant Science, Univ. of Delaware, Newark, DE 19717-1303.

² University Graduate Research Assistant and Associate Professor of Soil Chemistry, respectively.

Received for publication November 8, 1985.

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