Modeling the Sorption Behavior of Aromatic Amine Onto Sediment Under Acidic Conditions
In this study the sorption behavior of an aromatic amine (benzidine) in the aqueous-sediment systems was investigated. Three sorption mechanisms including hydrophobic partitioning, covalent binding and cation exchange govern the fate of benzidine after its entry into the ecosystems. A sorption equilibrium model was presented to investigate these sorption mechanisms under acidic conditions. Model simulation results indicated that the model fits the experimental data very well. The results also indicated that hydrophobic partitioning and covalent binding contributed more to the overall sorption than cation exchange did with increasing solution pH from 3.1 to near neutral.
KeywordsCation Exchange Sodium Citrate Aromatic Amine Covalent Binding Sorption Behavior
The authors thank the U.S. National Science Foundation for financial support in the form of a CAREER award (BES-0093191) to MC Nyman.
- Means, J.C., and R.D. Wijayaratne. 1989. “Sorption of Benzidine, Toluidine, and Azobenzene on Colloidal Organic Matter." In I.H. Suffet and P. MacCarthy (Eds.), Aquatic Humic Substances: Influence on Fate and Treatment of Pollutants, pp. 209–222. American Chemical Society, Washington, DC.Google Scholar
- U.S. EPA. 1999. Integrated Risk Information System (IRIS) on Benzidine. National Center for Environmental Assessment, Office of Research and Development, Washington, DC.Google Scholar