Sorption and Transport of Polynuclear Aromatic Hydrocarbons in Low-Carbon Aquifer Materials
Final rept. Jan 88-Jan 89,
CORNELL UNIV ITHACA NY DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Pagination or Media Count:
Sorption studies of polycyclic aromatic hydrocarbons PAH on low- carbon aquifer materials are reported. Both column and batch partition coefficients Kd were affected by synthetic polymeric components, such as Teflon, in commonly used experimental apparatus. These influences include incorrect estimates for Kd and tailing of peaks in column studies. Both batch and column experimental methods are developed, using polymer-free systems, that allow accurate measurement of Kds for hydrophobic PAHs in low carbon systems. Application of these methods shows that organic carbon contents below the commonly cited threshold level of 0.1 percent may dominate the partitioning and subsequent transport of phenanthrene in aquifer systems. Calculated Kd values from batch and column temporal first moment techniques did not agree. Reasons for the disparity in the results from these methods are discussed. Column results may be described using the batch Kd and two adjustable fitting parameters representing variables in a two-side kinetic model.
- Organic Chemistry