Interaction of hydrophobic organic compounds with mineral-bound humic substances.

Influence of Mineral-Bound Humic Substances on the Sorption ofHydrophobic Organic Compounds

Application of a membrane model to the sorptive interactions of humic substances.

Humic substances, the dark-colored, natural organic polyelectrolytes that are found in practically all soils, sediments, and natural water, strongly interact with both inorganic and organic pollutants. Inorganic cationic species generally undergo complexation reactions with humic substances. The binding of cations, such as cupric ions, by humic substances often markedly reduces their toxicity t...

Effect of molecular structures on the solubility enhancement of hydrophobic organic compounds by environmental amphiphiles.

Amphiphilic molecules, such as humic substances and surfactants, are known to increase the apparent aqueous solubility of hydrophobic organic compounds (HOCs) in the aqueous phase because of their molecular structures, which consist of hydrophilic and hydrophobic moieties. In this study, we examined the effect of the structures of humic acid and HOCs on the sorption of four polycyclic aromatic ...

Humic substances and napropamide interactions in aqueous solution: A fluorescence spectroscopy study

The complexation of organic solutes with dissolved humic substances (HS) is an important process for the fate of these chemicals in natural aquatic systems. We used the Fluorescence Quenching technique to study the interactions between napropamide, a common herbicide, and ten dissolved humic or fulvic acids extracted from different soils and peats. The primary mechanism of napropamide quenching...

Quinoline Sorption on Kaolinite–Humic Acid Complexes

pH and compound ionization. In contrast to the case for neutral PACs, an equilibrium partition model, whereby Adsorption of quinoline (pKa 5 4.92) and background electrolyte NHCs sorb in direct proportion to fOC, is not supported (LiCl) onto specimen kaolinite was measured as a function of surfaceby the available data. Retention of cationic NHCs may bound humic acid (HA) concentration ( fOC 5 0...