Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: September 28, 1998
Publication Date: N/A
Technical Abstract: Triazine interactions with soils and soil materials are extremely complex and involve numerous bonding mechanisms and synergistic effects. Bonding mechanisms include covalent, ionic, and H-bonding as well as charge transfer, van der Waals, and hydrophobic interactions. The electro- and stereochemistry of each active site is unique, affording an opportunity for several of the above bonding mechanisms to simultaneously interact with triazine molecules. Thus the organic and inorganic constituents of soils may be visualized as having a nearly unlimited number of active sites with a continuum of potential bonding energies. Although macroscopic soil properties, such as %OC, %clay, pH, %moisture, and temperature are statistically correlated with triazine sorption by soils, such correlations offer only vague hints as to the nature of bonding mechanisms. Simplistic sorption prediction models, such as sorption coefficients normalized by soil organic C content, often work reasonably well but may fail spectacularly for a specific soil or conditions due to the complexity of the sorption process.