A United Physicochemical Description of the Protonation and Metal Ion Complexation Equilibria of Natural Organic Acids (Humic and Fulvic Acids). 2. Influence of Polyelectrolyte Properties and Functional Group Heterogeneity on the Protonation Equilibria of Fulvic Acid

James Ephraim, Salvador Alegret, Andrew Mathuthu, Margaret BIcking, Jacob A. Marinsky, Ronald L. Malcolm

Research output: Contribution to journalArticleResearchpeer-review

120 Citations (Scopus)

Abstract

Potentiometric studies of the neutralization of several fulvic acid sources with standard base in aqueous and nonaqueous media have been conducted. Analysis of the results with a recently developed unified physicochemical model has shown that the protonation behavior of these fulvic acid sources is a reflection of (1) their polyelectrolyte nature and (2) their heterogeneity. It has been possible to ascribe the polyelectrolyte properties observed to a rather inflexible fulvic acid molecule whose variably charged surface is impermeable to simple electrolyte. © 1986, American Chemical Society. All rights reserved.
Original languageEnglish
Pages (from-to)354-366
JournalEnviron. Sci. Technol.
Volume20
Issue number4
DOIs
Publication statusPublished - 1 Jan 1986

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