A kinetic study of the interaction of hydrous aluminum oxide colloids with a well-characterized soil fulvic acid

Abstract

. Can. J. Chem. 60,2023Chem. 60, (1982.Models of the species arising from the interaction of hydrous aluminum oxide colloids with humic substances have been prepared by neutralizing AI(II1) stock solutions in the presence of a well-characterized fulvic acid and aging for 24 h. These samples have been examined kinetically using the fluorimetric AI(II1) reagent calcein blue. The rates of formation of Al(II1) calcein blue complexes allows recognition of five kinetically distinguishable components in the mixtures. Some are similar in lability to simple organic chelates of Al(II1). Others are much less labile. Evidence for non-labile colloidal "ternary" complexes of AI(II1) ion species complexed to fulvic acid, and bound to hydrous aluminum oxide colloid is presented. The polydisperse mixture character of fulvic acid is seen in patterns of complex lability much as it is seen in patterns of complex stability.

Kinetics of aluminum-fulvic acid complexation in acidic waters

“…With 740 for the molecular weight of FA, aluminum was always in at least a 130-fold excess over FA. Although the FA molecular weight is subject to some error (12), the aluminum concentration is almost certainly always large enough for pseudo-first-order kinetics to be in effect (13).…”

The Physical Chemistry of Pesticides in Soil and Water

“…Experimentally based kinetics and mechanism calculations can Agriculture 2017, 7, 91 3 of 6 begin. As anticipated from Langford's research [3,10,11], time-dependent kinetic rate coefficients result. Figure 4 provides an example of this [12].…”

“…Proof of concept has been published for the experimentally supported theory that reveals the kinetics and mechanisms of pesticides in soil and water [1][2][3][4][5][6][7][8][9]. For a soil immersed in a pesticide solution, the starting point was the answer to a critical question.…”

“…Secondly, the number of labile sorption sites has to be measured for kinetics calculations [1,2]. Experimental time-dependent kinetic rate coefficients are necessary for predictions [1][2][3][4]. Temperature experiments are needed at two levels.…”

“…Stoichiometry was ignored in this chapter. 3 Contrary to experimental evidence [17], the authors assumed that the kinetic rate coefficients were constants. 4…”