The Secondary Structure of Humic Acid and its Environmental ImplicationsEPA Grant Number: R822832
Title: The Secondary Structure of Humic Acid and its Environmental Implications
Investigators: Von Wandruszka, Ray
Institution: University of Idaho
EPA Project Officer: Hiscock, Michael
Project Period: August 1, 1995 through September 1, 1998
Project Amount: $323,438
RFA: Exploratory Research - Chemistry and Physics of Water (1995) RFA Text | Recipients Lists
Research Category: Water , Land and Waste Management , Engineering and Environmental Chemistry
Description:The purpose of this project is to study the molecular organization of dissolved humic acids and the role of these structures in the transport of nonpolar micropollutants in the subsurface environment. The focus of the investigation is the detergent model of humic acid and the pseudomicellar aggregates that give the substance its ability to sequester and solubilize hydrophobic species. The influence of the solution environment, including ionic strength and type of ion present, temperature, humic acid concentration, and humic acid origin will be studied. The mechanism of the sequestration will be determined in terms of these variables, and emphasis will be given to both intra-and intermolecular processes.
The results of the study will provide data for the estimation of facilitated pollutant transport by aqueous humic acids, depending on the nature of the humus, the local soil conditions, and the prevailing temperature.