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Bioavailability Prediction of Polycyclic Aromatic Hydrocarbons in Field-Contaminated Sediment by Mild Extractions |
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| Authors: | Li Lei Rajesh Bagchi Amid P. Khodadoust Makram T. Suidan Henry H. Tabak |
| Affiliation: | 1Process Engineer, Damon S. Williams Associates, 2355 E. Camelback Rd., Suite 700, Phoenix, AZ, 85249 (corresponding author). E-mail: llei@dswa.net 2MS Student, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, Cincinnati, OH 45221-0071. E-mail: rajesh_bagchi@hotmail.com 3Professor, Dept. of Civil & Materials Engineering, Univ. of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607. E-mail: akhodado@uic.edu 4Professor, 701 ERC, Dept. of Civil & Environmental Engineering, Univ. of Cincinnati, Cincinnati, OH 45221-0071. E-mail: makram.suidan@uc.edu 5Senior Chemist, Environment Research Center, National Risk Management Research Laboratory, EPA, 26 West Martin Luther King Drive, Cincinnati, OH 45268. E-mail: tabak.henry@epa.gov |
| Abstract: | Assessing the bioavailability of a group of polycyclic aromatic hydrocarbons (PAHs) coexisting in a field-aged contaminated sediment was examined using mild extractions by isopropanol- and ethanol-water solutions at concentrations of 5–100%, using extraction durations from 1?h?to?7?days. At a given solvent concentration, an initial rapid phase of PAH desorption was generally observed during the first 12?h, followed by a subsequent slower phase of desorption. A similar biphasic desorption was evident with increases in solvent concentration. PAH removal by various mild extractions was compared with PAH biodegradation by indigenous microorganisms. The removal of individual PAHs using 1-day 70% ethanol extraction was closely correlated to corresponding PAH removal via biodegradation, suggesting the possibility of using alcohol-water solution to simultaneously predict the bioavailability of multiple PAHs in aged sediments to indigenous microorganisms. |
| Keywords: | Extraction procedures Biodegradation Correlation Contaminants Sediment |