Additions and Corrections - The Reactivity of Hydrous Alumina toward Acids

Abstract

Page 2697. In Col. 1, line 6, for "in vivo" read "in vitro."Page 2698. In the second line of formulas, the last one is IV instead of VI.

Partitioning of inorganic orthophosphate in soil‐water systems∗

“…In acid solution the reactivity of these groups to ligand exchange is in the order aquo >hydroxo > ol. 118 Ligand exchange of phosphate with aquo groups would add negative charge to the surface but would not increase the concentration of the hydroxl ions in the solution (Equation 45). In contrast, the exchange of phosphate with hydroxo groups would not affect the surface charge, but would release equivalent amounts of hydroxyl ions into the solution, as …”

IDENTIFICATION OF PHOSPHATE‐REACTIVE SITES OF HYDROUS ALUMINA FROM PROTON CONSUMPTION DURING PHOSPHATE ADSORPTION AT CONSTANT pH VALUES

“…Specific adsorption of phosphate can occur by ligand exchange with aquo, hydroxo, or 01 groups. At acid pH values the reactivity of these groups to ligand exchange is in the order of aquo 2 hydroxo > 01 (Thomas and Tai, 1932;Thomas and Owens, 1935;Thomas and Kremer, 1935;Graham and Thomas, 1947). Considering the order of reactivity, it can be expected that the ligand exchange with the more labile groups would occur at low concentrations, and that exchange with the less labile grou s would become significant at increasing concentranegative charge to the surface but would not increase the concentration of the hydroxyl ions in the solution (equation 2).…”

“…At still higher concentrations the less reactive 01 groups would become the predominant sites for phosphate adsorption. Available evidences (Thomas and Kremer, 1935;Thomas and Owens, 1935;Graham and Thomas, 1947;Hem and Roberson, 1967;Hsu, 1968)…”

Physicochemical Fate of Sulfate in Soils

“…37 These reactions involve two steps. The first step involves the rapid conversion of hydroxo groups into aquo groups.…”