Innovative Approach to Determine Retardation Factors of Organic Contaminants inGroundwater Systems. Final Report

摘要

To elucidate the mechanism and magnitude of sorption of hydrophobic organicchemicals (HOCs) to mineral surfaces, sorption experiments were conducted using a homologous series of alkylbenzenes (benzene, toluene, ethylbenzene, propylbenzene, butylbenzene) and well-characterized mineral sorbents. A headspace analysis system was constructed, characterized, and the methodology developed for studying sorption to mineral solids. This method determines the activity of the analyte in the headspace in equilibrium with water (Henry's Law) or with mineral solids. Henry's Law constant for the alkylbenzenes was determined repeatedly as a function of temperature (5 to 30C) and ionic strength (.0001 to .01 M) at constant pH = 7.0. The method delivered precise measurements of Henry's Law (+ or